2013年5月30日星期四

Fiber trolley furnace

Fiber trolley furnace uses:
Fiber trolley furnace is mainly used for high temperature annealing and normalizing of the metal member, can also be used a variety of heating of the metal or metalloid in the 1000 ° C or less.
All-fiber trolley heating furnace body structure:
Fiber trolley furnace furnace is mainly composed of steel plate and steel welded steel plate thickness of 5 mm, using the steel skeleton to strengthen, with sufficient strength and stiffness, installed on the roof two temperature thermocouple seat to ensure thermoelectric even inserted inside the furnace temperature. In front of the furnace furnace panel and door are heat-resistant cast iron, has a heat distortion characteristics of a small, consider workpiece normalizing, trolleys pull out the workpiece, the workpiece with a high temperature, the choice of door and the furnace panel of heat-resistant castings to prevent the deformation of the door and the furnace panel in the hot state.
Fiber trolley furnace heating elements:
Fiber trolley furnace heating element used Shougang Gitane alloy produced resistance band, made 0Cr25AL5A heating element is divided into two areas, located in the side wall of the furnace and the trolley, the heating element is wound into a zigzag , Y connection, after the trolley heating element wiring using plug knife wiring structure, the heating element 2-zone temperature control, power arrangement give full consideration to the door of the heat loss characteristics, in both sides of the wall and station car The front area design appropriate to increase the power to reduce the heat loss of the door. The heating element is hung on both sides of the furnace, the heating element and the furnace bottom of the trolley to leave a certain distance, to prevent the heating element and the furnace bottom short.
All-fiber trolley furnace lining structure
The all-fiber trolley furnace lining all-fiber structure. Selection of high-alumina fiber folding block full fiber structure is mainly distributed in the side wall of the furnace, the front wall, back wall, roof and door hanging fiber roof, made of fire-resistant fiber folding block module buried anchors hanging out the folding module on the top of the expansion of the left between each line module to prevent thermal expansion and contraction of the module. The roof structure of the flat-topped, energy saving, reduce wasted space, and compact structure. On both sides of the furnace wall, front wall, back wall and door are made of fire-resistant fiber folding block, folded pieces of buried anchors. The side wall of the furnace back wall and door folding block in addition to buried anchors, buried pieces of porcelain and support staff fixed heating element to fall hanging heating element. This structure in Shandong bright steel forging factory, Dalian Locomotive Works cast steel branch, Datong Locomotive Works heat treatment branch in Dalian Locomotive Works heat treatment factory large trolley furnace use, very good results have been used in the past two years without any quality problems. Trolley lining material mainly consider the carrying capacity of the refractory layer selection of heavy high alumina bricks, insulation choice of thermal conductivity of 0.6 kcal / m. Degrees lightweight insulation tiles.

2013年5月29日星期三

Large full fiber trolley furnace temperature

Large full fiber high temperature car furnace Scope:
Large full fiber trolley furnace is mainly used for high-temperature high-chromium, high manganese castings, die steel, roller, ball, crusher hammers, wear-resistant liner hardening, annealing, aging and a variety of large-scale machinery parts heat treatment.
Large full fiber trolley furnace temperature characteristics:
Large full fiber high temperature car furnace using high quality long fiber blanket thorns fiber structure composed of all the advantages of low thermal conductivity, heat capacity, excellent corrosion resistance, excellent thermal stability and thermal shock resistance, thermal insulation, energy-saving 30 relative brick hearth -60%. Trolley impact-proof bricks which automatically seal trolley and the furnace door rails, without foundation installation, can be used on level ground. High temperature resistance alloy heating elements made ​​of ribbon or spiral wound, were installed in the furnace side door, the back wall and put silk brick trolley, ensuring high furnace temperature uniformity and stability. Microcomputer program control and recording temperature curve, high precision temperature control. In accordance with technical requirements automatically heating, insulation, power and other functions. Large full fiber trolley furnace temperature recording instruments have recorded over temperature alarm, burnout alarm.

2013年5月27日星期一

All-fiber high temperature car furnace

Fiber high temperature car furnace Scope:
Fiber high temperature car furnace apply evenly before extrusion of the alloy and alloy steel ingot rough during diathermy, but also for other alloy parts normalizing annealing, quenching and tempering treatment.
Fiber high temperature trolley furnace heating elements:
Fiber high temperature car furnace heating elements 0Cr21Al7M02 high-temperature alloy resistance band, silk.
Fiber high temperature car furnace heating elements fixed corundum ceramics screw positioning, the septum between the resistance band with fiber lining, prompting the heat to be distributed promptly to the workpiece, the use of temperature up to 1250 ° C; the furnace floor mining zCr35Cr24Ni7SiN high temperature alloy steel small block bump Interface assembled, eliminate the workpiece oxide fall into the tank of the furnace wire circuit phenomenon; lining with high alumina (1360) or (1430) zirconium-containing aluminum silicate fiber high pressure module assembly forming small thermal conductivity, heat storage low, good sealing, energy-saving rate, long service life than the refractory brick lining.
Fiber high temperature trolley furnace advantages:
1 no noise, no environmental pollution.
Regenerative small, less heat loss
3 high precision temperature control, temperature uniformity.
High degree of automation, simple operation.
5 can be used PID programmable, fully automatic performance.
Good sealing, long life, safe and reliable.

Controlled atmosphere box furnace

Controlled atmosphere box furnace made of high quality steel Seiko, electrostatic spraying the surface, beautiful appearance. The studio quality refractory firing from the furnace, the heating element can be configured depending on the temperature (generally have high temperature resistance wire, silicon carbide, molybdenum wire, silicon molybdenum rod, etc.). Insulation materials are lightweight insulation tiles and high quality aluminum silicate refractory fiber cotton. Gas system with a flow meter, pressure reducing valves, the overall furnace shell sealed globe valves, equipment, the furnace mouth sealed with silicone rubber plus water-cooled. Supporting the controlled atmosphere box furnace temperature control part of the adjustable PID intelligent instrument control may be prepared more than one block, precise control of the firing process, and with the flow, limiting, thermal protection function. When the door is opened with automatic power-off function to ensure maximum safety of users. The equipment is heating up fast, good insulation properties, temperature uniformity, the use of safe, convenient, energy saving, environmental protection and other features.
Controlled atmosphere box furnace uses:
Controlled atmosphere box furnace particularly for heat treatment of raw materials in a controlled air (argon, nitrogen, synthesis gas, etc.). The maximum temperature of 1100 ° C, is mainly used for annealing, tempering, soldering, steel powder sintered
Controlled atmosphere box furnace advantages:
Controlled atmosphere box furnace side and bottom heating ensure according DIN 17052-1 furnace air evenly.
With high mechanical resistance, made of silicon metal plate covering the bottom of the furnace heating spiral tube.

2013年5月24日星期五

Double chamber vacuum chamber furnace

Double chamber vacuum chamber furnace is based on production, processing sintered graphite plate at the same time according to user needs can be made into a furnace mobile, used in conjunction with two furnace buildings to reduce energy consumption, maximize the use of effects.
Double chamber vacuum chamber furnace Features
1, using a furnace-like structure of the whole fiber, has an excellent energy saving performance, 30 ~ 38% energy saving than the same specifications of the tile body resistance furnace, a heating rate of 1-fold increase;
, Furnace lightweight portable electric device can remove the furnace, exposing the stove liner, cooling rapidly.
3 furnace mobile, easy maintenance and repair of equipment, to improve the life of the furnace.
4, bell-type resistance furnace can cover multi-furnace, increase productivity, save and invest.
5, the furnace tube made into corrugated effectively guarantee the life and strength.

2013年5月23日星期四

Tubular resistance furnace

Tubular resistance furnace Products
The series resistance furnace cycle of operation for the laboratory, industrial and mining enterprises, research institutes, institutions for heating element determination and small size steel hardening, annealing, tempering and other heat treatment furnaces can be made of metal, ceramic The sintered, dissolution and analysis of high-temperature heating.
Tubular resistance furnace Features
1, shell is made of high-quality cold-rolled steel, surface spray process, door side door structure, closed Kai flexibility.
2, the temperature box furnace enclosed fire, electric alloy wire heating element into a spiral, coiled into the walls of the furnace, heat and temperature uniformity extended service life.
3, high-temperature tube resistance furnace with high temperature combustion tube, silicon carbide heating elements installed in the furnace jacket.
, High temperature box resistance furnace with silicon carbide heating elements, directly installed in the furnace, the utilization of geothermal energy.
5, the series resistance furnace insulation materials selection of lightweight foam insulation brick and aluminum silicate fiber cotton, so that the heat storage capacity and thermal conductivity is reduced resulting in the heat storage capacity of the furnace to heat up time, surface low temperature air furnace attrition rate, low power consumption The amount is also greatly reduced.
6, the controller is divided into: a pointer type, digital, microcomputer multi-band temperature control type.
                

2013年5月21日星期二

The full fiber Pit resistance furnace

Fiber Well resistance furnace lining preclude the use of new high-purity thrown silk carpet made through special processing, the temperature is controlled by the upper and lower partition of PID intelligent automatic control, can be programmed according to the workpiece process warming. The insulation curve tracking the lid lifting according to the severity of manually. Electric actuator. Applicable alloy ring. Flanges. Wire rod for high temperature through the heat. Normalizing. Quenched. Annealed. You can also quenching multi-purpose.
Fiber Pit resistance furnace uses:
Fiber Well resistance furnace is mainly used for shaft hardening, normalizing, uniform heating temperature, the amount of deformation of the workpiece. Load-bearing refractory brick structure, the oversize carbon steel parts tempering average temperature heat treatment.
Fiber Pit resistance furnace advantages:
1, the full fiber Pit resistance furnace has a large fan device, increasing the furnace temperature uniformity; (optional)
2, all-fiber Well resistance furnace of the multi-zone control, further improve temperature uniformity;
Furnace with stainless steel air guide barrel; (optional)
4, the lid opening and closing driving lifting or automatic hydraulic opening and closing mechanism, with the guide posts to ensure the lid open and close smoothly; (or lid boot device: hydraulic cylinders and hydraulic machinery lid open from the middle to both sides .)
5, the lid and the furnace temperature resistant fibers cotton production, the furnace insulation performance, save energy and reduce production costs;
6, no pollution, environmental benefits.

2013年5月20日星期一

Tube atmosphere Resistance furnace

Tubular resistance furnace atmosphere Scope:
Tubular resistance furnace atmosphere for laboratories, universities, research institutes as chemical analysis, physical measurement and thermocouple test with a protective atmosphere heating. Supply complete sets include: flow meter, pressure gauge, furnace, temperature controller and temperature measurement devices.
Tubular resistance furnace atmosphere structural features:
Energy-saving ceramic fiber materials and double-layer structure, the surface temperature down to room temperature.
Average temperature mayor, easy to operate, reliable sealing, higher overall performance indicators, the leading domestic level.
Can choose to configure the heat-resistant steel, quartz glass, ceramics and other materials corundum furnace tube a mechanical vacuum pump (optional).
Optional: 40 segments programmable controller model to select RS-485 serial port (optional) computer communications.

2013年5月17日星期五

High and low temperature of the high and low temperature approach to troubleshooting troubleshooting methods

High and low temperature in the high-temperature test, such as temperature change to reach the test temperature, you can check the electrical system, troubleshooting one by one. Such as temperature rose slowly, it is necessary to check the air circulation system, look at the damper is open normal air circulation, and vice versa, check the air circulation motor is functioning properly. If the temperature overshoot powerful then you need to set the parameters of the PID tuning. If the temperature rise directly, over temperature protection, then, the controller failed, control instruments to be replaced.
Second, the high and low temperature in the sudden failure of the test is running, the control on the instrument corresponding fault display prompts and voice alarm. The operator can control the operational use of the device in the Troubleshooting chapter quickly check which category failure, you can ask professionals to quickly troubleshoot to ensure the normal conduct of the trial. Other environmental testing equipment in use there will be other phenomena, it should be a specific phenomenon, specific analysis and troubleshooting. Environmental testing equipment but also regular maintenance, refrigeration system condenser cleaned regularly, lubrication, electrical control system maintenance checks on a regular basis for moving parts shall be specified, such work is essential
Third, the high and low temperature low temperature reach test indicators, then you have to observe the changes of the temperature, the temperature drop is slow, or the temperature to a certain value tends to increase in temperature, the former is necessary to check, and low temperature Before the test, whether the studio drying, the studio will remain dry and then test sample into the working chamber to do the test, the working chamber of the test sample is placed too much, so that indoor air can not be the full cycle of exclusion of the above reason, we must consider whether it is a fault in the cooling system, so that would be for the manufacturers of maintenance professionals. The latter phenomenon is the use environment of the device is bad due to the ambient temperature, the device is placed to meet the requirements placed distance from the wall (Case) (in the device operation instructions for use are specified).
Fourth, the high and low temperature in the hot and humid test, the actual humidity will reach 100% or the actual humidity and target humidity vary widely lot of low value, the former phenomenon: It may be caused by dry gauze on the wet bulb sensor, it is necessary to check whether the lack of water in the water tank of the wet bulb sensor, the water level in the tank is automatically controlled by a level controller, check the water level controller water supply system is normal water supply, water level controller is working properly. Another possibility is that the wet bulb gauze from the use of a long time, or the quality of water purity reasons, make the gauze hardens, the gauze can not absorb moisture and dry, replace or clean gauze to exclude the above phenomenon. The latter phenomenon is mainly humidification system does not work, the water supply system of the humidification system, water supply system whether there is a certain amount of water, the control of boiler water level of the humidifying water level control is normal, whether the normal water level within the humidification boiler. Such as the above, all normal, it would have to check the electrical control system, professional service personnel.

2013年5月16日星期四

Iron copper pusher sintering furnace
Iron copper pusher sintering furnace
This series of iron copper pusher sintering furnace automatic continuous operating powder metallurgy special equipment, mainly used for the sintering of powder metallurgy products. Equipment package consists of three parts of the furnace, material boat push device and temperature control system. The heating element distribution in the muffle on the lower side, the left and right on both sides of the furnace through a pull-installation, installation and maintenance is very convenient. Each are configured by a thermocouple, digital-only PID controller and SCR closed-loop control system, automatic precise temperature control.
Iron copper pusher sintering furnace use
Iron copper pusher sintering furnace is automatic continuous operating powder metallurgy special equipment, mainly used for the sintering of powder metallurgy products. Equipment package consists of three parts of the furnace, material boat push device and temperature control system.

2013年5月15日星期三

Cover Tablet sintering furnace

Cover plate sintering furnace introduced
Cover plate sintering furnace furnace cover lifting structure, ceramic fiber material by specialized technology to build the furnace, and the whole process of multi-stage programmable temperature controller automatic temperature control, the company developed its own high performance and energy saving new resistance furnace, novel structure, easy to operate, high overall performance indicators, the leading domestic level.
Cover plate sintering furnace use
Cover plate sintering furnace is designed for building ceramic plate simulated roller kiln sintering process requires the development and design of batch furnace, the available research institutes, universities, industrial and mining enterprises and other units as fossil glass, slag glass-ceramic , artificial marble, large or small and medium-sized flat-screen high-temperature sintering of the material, microcrystalline glaze process. Production cycle mode of operation, is ideal for production and experimental equipment.
Cover plate sintering furnace Benefits
Ceramic fiber furnace insulation energy-saving
Electric rods arranged from top to bottom temperature uniformity
Warming fast-power small section of time and money
Controllable exhaust cooling easy to operate
Intelligent program automatic temperature control process
A cover tablet sintering furnace temperature control system
Cover plate sintering furnace temperature control system using duplex mode (dual independent principles), the master meter self-balancing recorder using Shanghai Dahua long Figure Japan SHINKO intelligent digital temperature controller, recording / monitoring instrument, using high-power modular three-phase thyristor control method of self-tuning fuzzy PID adaptive control furnace temperature. The sampling period is 250ms, temperature alarm value, alarm, temperature, upper and lower limits of the user according to the actual situation of the various processes in the menu of the instrument of their choice. As a result of Japan Shinko advanced control algorithms to speed up the overshoot, less tone detection and correction time, greatly improving the anti-overshoot or less tone, disturbance rejection capability.

Iron copper pusher sintering furnace

This series of iron copper pusher sintering furnace automatic continuous operating powder metallurgy special equipment, mainly used for the sintering of powder metallurgy products. Equipment package consists of three parts of the furnace, material boat push device and temperature control system. The heating element distribution in the muffle on the lower side, the left and right on both sides of the furnace through a pull-installation, installation and maintenance is very convenient. Each are configured by a thermocouple, digital-only PID controller and SCR closed-loop control system, automatic precise temperature control.
Iron copper pusher sintering furnace use
Iron copper pusher sintering furnace is automatic continuous operating powder metallurgy special equipment, mainly used for the sintering of powder metallurgy products. Equipment package consists of three parts of the furnace, material boat push device and temperature control system.

2013年5月14日星期二

Vacuum sintering furnace

Vacuum sintering furnace Products
ZK-20-10 (JZS-16) vacuum sintering furnace, the pit furnace shell made of steel plate, furnace structure is made of steel welding. Lining use of 0.6g/m3 super lightweight beads energy-saving firebrick, sandwiched between the lining and the furnace shell aluminum silicate fiber felt, void fill insulation powder expansive, is a typical energy-efficient furnace lining, saving 30% -60%. Heating element with uniform standards at home and abroad resistance to ultra-temperature and high-temperature resistance wire 0Cr25Al5 1Cr18Ni9Ti stainless steel vacuum tank rolling, densely welded using automatic protection, suppression of large-scale X-ray Inspection Room Inspection Test by our factory. Lid with stainless steel holding furnace lid, the lid panel and the tank with the dark twin water-cooled vacuum rubber seal, furnace panel installed on the vacuum interface, sent to protect the atmosphere interface, vacuum pressure gauge. Lid and tank furnace by workshop driving the entire vacuum tank hanging out forced air convection or pool quench for loading and unloading the workpiece. Order two really can improve production efficiency, alternately continuous operation. Natural cooling with the furnace. The vacuum sintering furnace mechanical vacuum pump rotary vane vacuum or pre-vacuum filled with nitrogen gas for vacuum sintering, bright annealing, tempering, quenching and other non-oxidizing heating oil diffusion pump continuous pumping.
Vacuum sintering furnace use
ZK-20-10 (JZS-16) vacuum sintering furnace is energy-saving Pit cycle operation vacuum furnace. Mainly used in aerospace, aviation aircraft manufacturing industry, automobile manufacturing industry, petroleum machinery industry, precision machinery manufacturing, metal or non-metallic materials, parts and components vacuum sintering. Can also be used for precision mechanical parts or forging bright oxidation decarburization heat treatment and annealing of the ball.

2013年5月13日星期一

The microwave vacuum high-temperature sintering furnace

Microwave vacuum high temperature sintering furnace advantages
The microwave vacuum high-temperature sintering furnace burned material to absorb microwave energy so that its temperature rises purpose of sintered high-speed rotation of the polarization in the microwave field. Compared with the traditional sintering furnace has the following advantages: 1. Greatly shorten the sintering time than the conventional furnace sintering. 2. Shorten the processing time, energy costs are greatly reduced. 3. The overall volumetric heating, rapid heating, heating uniformity, fine texture high quality sintered function, electronic structure of ceramic; magnetic materials as well as powder metallurgy materials. 4. Small footprint, excellent working environment, easy automatic control, save manpower. Abroad since the late 1990s due to the obvious advantages of the new technology to get the very rapid development. From the early 1990s to the present, has always insisted on the research and development of this new technology, programmable microwave source to solve a series of high stability microwave high temperature ceramic sintering technology; package of high-performance microwave transmission system; single-mode and the large volume of multi-mode microwave cavity CAD preferably; key technical issues of the sintered sample temperature measurement and control technology, has developed several sets of Wuhan University of Technology, Tsinghua University, Sun Yat-sen University, Southwest University for Nationalities, Wuhan Institute of Chemical Technology institutes 5kw/2450mhz test, experiment room microwave sintering system, metal oxides, ceramics, phosphor and a variety of materials such as high-temperature sintering, has achieved good results.
Microwave temperature vacuum sintering furnace technical requirements
1. The material is calcium salt, specific gravity of 1.4 g / cc, the material itself absorb microwave performance is not good.
2. Sintering temperature: 1100 ° C, holding a certain time;
3. The devices require the production of not less than 600 kg / h.
Equipment for continuous production, stable and reliable, easy to operate.
Microwave temperature vacuum sintering furnace design
Microwave vacuum high-temperature sintering furnace according to the principle of microwave sintered at high temperature insulating material, although it belongs to absorb microwave poor material, but as long as the purpose of the proper absorption of microwave fine materials in connection with the mixed in appropriate proportions can also achieve high-temperature calcination, select toner or silicon carbide material powder evenly mixed and heated, many trials to obtain good results as a basis for the proposed design as follows: The system consists of microwave power and transmission system; multimode the rectangular microwave heating cavity; microwave with infrared insulation section; material handling systems; temperature measurement and control systems and system control cabinet and rack components. By technology and production requirements at the same time, preliminary calculation 220kw microwave power, we compare several programs may be implemented, to ensure performance requirements, technical difficulty, manufacturing and operating costs and other factors to consider using the following preferred embodiment: tube microwave power combiner; multi-stage multi-mode the rectangular microwave heating chamber series combination; design and selection of metal plate conveyor, frequency control transmission end of the to add infrared radiation auxiliary heating and insulation; the designed import and export two-stage microwave suppressor to ensure that the microwave leakage safety standards; system; material temperature control; total control of the whole plc.

2013年5月10日星期五

lab furnaces,laboratory furnace

muffle furnace laboratory furnace work applications
1.Circulating air to enhance the rate of oxidation
2.volume capacity: 20, 50, 100 mL
3.Strong anti-fracture
4.can be reused
5.Cooled to room temperature within 5.30 seconds
6.samples plus airtight lid
Laboratory furnace features:
1.heating up fast and easy to control: the maximum temperature up to 1200 ° C, 1-8 step 16 above temperature gradient.
2.without charring direct ashing: omitting the sample into the muffle furnace to evaporate the moisture was removed by combustion during carbonization of organic matter.
3.ashing time is short: most of the samples within 10 minutes you can completely ashing, ordinary muffle furnace it takes to several hours or even tens of hours.
4.The instant cooling: ashing is complete only tens of seconds to cool down, the traditional method takes an hour or even longer.
5.is compatible with a variety of traditional crucible, to more the CEM patent quartz fiber crucible, ashing faster.
6.Accurate and safe: the safety of the internal locking mechanism automatically stops the operation of the instrument in the scene of an accident.
Laboratory furnace box resistance furnace use
Furnace shall be placed in indoor flat bench. The thermostat should avoid vibration, placement and electric furnace should not be too close, to prevent overheating of the electronic components is not working properly. Thermostat should be moving the power switch is set to "Off."
(2) setting the temperature indicator pointer to the desired operating temperature, power on, press the power switch of the electric furnace is energized, the current meter reading, temperature indicator pointer is gradually increased, furnace, thermostat In normal operation.
Used again when the electric stove the first time or after a long-term disabled, must be dry oven and bake for 4 hours, 200 to 600 ° C open the door closed bake 4h: 20 to 200 ° C.
(4) the use of the electric furnace, the furnace temperature shall not exceed the rated temperature, so as not to damage the heating elements.
Prohibited directly to the furnace perfusion variety of liquids and melting metal, keep the furnace clean.
Regularly check the conductive system of the furnace, thermostat each connection part contact is good. Failure should be de-energized immediately to qualified service personnel.
Laboratory furnace Caution:
1. The first time or again after long-term disabled oven temperature should be 200 to 600 ° C, about 4 hours.
2 furnace temperature shall not exceed the maximum temperature, and do not work long hours in the above rated temperature.
Work environment requires non-flammable easy goods and corrosive gases.
To ensure your safety, you must install ground, and well grounded.
5. Door to light off light on, to prevent damage to the parts.
Taking samples in the furnace, you should first turn off the power, and gently, in order to ensure safety and to avoid damage to the furnace.
7 to extend product life and ensure safety, after the end of the use of the equipment should be promptly removed from the furnace samples, exit the heating and turn off the power.

Box type muffle furnace

Introduction to the box-type muffle furnace
The box muffle furnace design and production requirements according to national standard GB/T212 the furnace selection of light heat insulation material, high strength, good insulation properties, heating speed furnace equipped with controllable chimney, especially for coal, coking products, chemical raw materials, chemical analysis.
Box muffle furnace structural features:
Box type muffle furnace using special insulation materials, reasonable structure, high strength, good insulation properties, heating up fast, is a new generation of energy-saving products. Door is self-locking mechanism, convenient and reliable switch box muffle furnace body made of stainless steel, beautiful and durable. Controlled chimney installed in the furnace furnace air pollution protection sample purity protection.
Box type muffle furnace Scope:
Box type muffle furnace is widely used in coal, electric power, metallurgy, chemical industry, petroleum, geological, environmental protection, building materials, textile, feed, coking, liquefaction, gasification, paper, military, medicine, port, railway, commodity inspection, as well as tertiary institutions school laboratories and research institutes, laboratories, physical and chemical analysis room.