Flame retardant conveyor belt product introduction and technical parameters
1. Product core introduction
Flame retardant conveyor belts are special conveyor belts that achieve "fireproof when exposed to fire, self-extinguishing when away from fire, low smoke and low toxicity" by adding flame retardants and anti-static agents to the rubber formula and optimizing the flame retardant performance of the skeleton materials. The core solves the safety hazards caused by sparks generated by friction and material impact on conveyor belts in flammable and explosive scenarios such as coal mines, chemical industry, and metallurgy. It also has the characteristics of "wear-resistant and tear-resistant, anti-static, and compatible with complex working conditions", and is a mandatory compliance device for material transportation in high-risk industries.
1. Core characteristics
Good flame retardant performance：Adopting a "halogen flame retardant + inorganic flame retardant" composite formula (such as aluminum hydroxide, decabromodiphenyl ether), oxygen index ≥ 32%, in accordance with the GB/T 10822-2021 "General Purpose Textile Core Flame Retardant Conveyor Belt" standard, vertical burning time ≤ 30 seconds, no smoldering phenomenon; coal mine special models also meet the requirements of MT/T 113-2019 "Coal Mine Flame Retardant Conveyor Belt", in the alcohol lamp burning test, flame burning ≤ 10 seconds, smoke burning ≤ 30 seconds.
Meet anti-static standards：The rubber layer is内置with conductive carbon black or anti-static agent, the surface resistance of the conveyor belt ≤ 3×10Ω, the volume resistance ≤ 1×10Ω, can quickly release the static electricity generated by friction, avoid the accumulation of static electricity causing sparks, and adapt to scenarios with strong static electricity risk such as underground coal mines and chemical solvent transportation.
Enhanced wear resistance and impact resistance：The base skeleton of the conveyor belt is made of high-strength polyester canvas (EP), nylon canvas (NN), or flame retardant steel wire rope core (ST), covered with high-wear-resistant flame retardant rubber, tear strength ≥ 28kN/m, wear resistance performance is 25% higher than ordinary flame retardant belts, after 1 million friction tests, the amount of covered rubber wear ≤ 3mm, suitable for the transportation of bulk materials (such as raw coal, ore) in coal mines and metallurgy industries.
Low smoke and low toxicity design：The smoke density (transparency) during combustion ≥ 70%, the release amount of toxic gases (such as carbon monoxide, hydrogen chloride) ≤ 500ppm, in accordance with the GB/T 2408-2021 "Plastic Determination of burning performance horizontal method and vertical method" low smoke and low toxicity requirements, to reduce the risk of personnel casualties during a fire.
Multi-scene Adaptability: Divided into "Coal Mine Flame Retardant Belt" and "Universal Flame Retardant Belt" according to the purpose, it can be customized with acid and alkali resistance (pH value 2-12), cold resistance (-40℃-80℃), and high temperature resistance (120℃-200℃), meeting the needs of different high-risk working conditions such as underground coal mines, chemical plant workshops, and metallurgical factory high-temperature areas.
2. Applicable Scenarios
Coal Industry: For underground transportation of raw coal, washed coal, and coal gangue, such as transfer in the fully mechanized mining working face, and transportation in the main transport roadway underground, in accordance with MT/T 113-2019 standard, to avoid the risk of gas and coal dust explosion.
Chemical Industry: For the transportation of materials soaked in solvents (such as ethanol residue, acetone waste), flammable and explosive particles (such as sulfur, phosphate ore powder), and acid and alkali corrosive materials (need to select acid and alkali resistant flame retardant type), suitable for chemical workshop, transfer lines of dangerous goods warehouses.
Metallurgical Industry: For the transportation of high-temperature coke (180℃-250℃, need to select high-temperature resistant flame retardant type), steel slag (no risk of open fire but need to be anti-static), suitable for the material transportation system of steel mills and coke plants, to avoid high-temperature materials igniting the conveyor belt.
Grain Processing Industry: For the transportation of flour, starch and other dusty materials that are prone to explosion, anti-static properties can prevent the accumulation of dust static electricity causing an explosion, suitable for the lifting and transportation lines of flour mills and starch mills.
Waste Treatment Industry: For the transportation of mixed waste before waste incineration (including flammable materials such as plastics, paper), flame retardant performance can avoid the waste of flammable materials in the waste incineration plant igniting the conveyor belt, suitable for the feed transportation system of waste incineration plants.
II. Universal Technical Parameters
The following are the core technical parameters of flame retardant conveyor belts (including fabric core, steel wire rope core series), and coal mine special models need to meet MT/T 113-2019 standard additionally, and specific models can be customized and adjusted according to working conditions:
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Parameter category |
Parameter range / standard value |
Explanation |
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Basic structural parameters |
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Conveyor belt type |
Fabric core flame retardant belt (EP/NN series), steel wire rope core flame retardant belt (ST series), coal mine special flame retardant belt (EP/NN/ST series) |
Fabric core is suitable for medium and short distances, medium and low tension; steel wire rope core is suitable for long distances, large tension; coal mine special belts need to pass coal safety certification. |
|
Baseband width (B) |
500mm; 650mm; 800mm; 1000mm; 1200mm; 1400mm; 1600mm; 1800mm; 2000mm |
Normal width ≤ 2000mm, the width of the belt in the coal mine needs to be adapted to the size of the roadway, usually ≤ 1600mm |
|
Covering rubber type |
Natural rubber (NR) + Styrene butadiene rubber (SBR) + Flame retardant, chloroprene rubber (CR, acid and alkali resistant flame retardant type), ethylene propylene rubber (EPDM, high temperature resistant flame retardant type) |
Ordinary type adaptability without corrosion at room temperature; CR adaptability for acid and alkali scenarios; EPDM adaptability for high temperature scenarios of 120℃-200℃. |
|
Covering rubber thickness |
Top cover rubber 4-15mm, bottom cover rubber 3-8mm |
Strong wear-resistant materials (such as raw coal, ore) select upper glue ≥8mm; light load materials (such as flour) select upper glue 4-6mm |
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Number of skeleton layers (cloth core) |
2 layers; 3 layers; 4 layers; 5 layers; 6 layers |
The more layers, the higher the tensile strength, it is recommended to use 3-5 layers in underground coal mines to enhance impact resistance. |
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Performance parameters |
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Flame retardant performance |
General type: meets GB/T 10822-2021 Flame retardant grade 1 (vertical burning ≤ 30 seconds, no smoldering); Coal mine type: meets MT/T 113-2019 (alcohol spray lamp burning: with flame ≤ 10 seconds, without flame ≤ 30 seconds) |
Coal mines need to obtain the "Coal Mine Safety Mark Certificate" (MA mark) |
|
Anti-static performance |
Surface resistance ≤ 3 × 10⁸ Ω, volume resistance ≤ 1 × 10⁹ Ω (in accordance with GB/T 30326-2013 standard) |
The anti-static performance of coal mine scenes needs to be regularly detected to avoid performance decay. |
|
Rated tensile strength |
Fabric core (EP/NN): 100-315kN/m; Steel wire rope core (ST): 200-630kN/m |
It is recommended to set the safety factor of coal mine belts at 8-10 times (higher than ordinary belts) to cope with complex tension underground |
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Delivery speed |
0.8-3.15m/s |
The speed in the mine should be ≤2.5m/s to avoid friction and heat generation. |
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Temperature range |
Ordinary type: -40℃-80℃; Cold-resistant type: -50℃-80℃; High-temperature resistant type: 120℃-200℃ |
Low temperature scenarios avoid belt brittleness, high temperature scenarios need to select EPDM material |
|
Acid and alkali resistance (acid and alkali resistant type) |
pH value 2-12 (room temperature) |
After 24 hours of soaking, the tensile strength retention rate ≥75%, and the flame retardant performance is not attenuated. |
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Material parameters |
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Skeleton material |
Flame retardant polyester canvas (EP100-EP315), flame retardant nylon canvas (NN100-NN315), flame retardant steel wire rope (ST630-ST4000) |
The skeleton material needs to be flame retardant treated to avoid the skeleton burning and exacerbating the fire. |
|
Covering rubber Shores hardness |
60±5 Shore A (Regular); 65±5 Shore A (Durable) |
Medium hardness, balanced flame retardancy, abrasion resistance and elasticity, avoid too hard causing cracking. |
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Smoke density |
Minimum light transmission during combustion ≥70% (in accordance with GB/T 10781.1-2021 standard) |
Low-smoke design improves visibility during a fire, facilitating evacuation of personnel |
Remarks
When selecting high-risk scenarios such as coal mines and chemical industries, manufacturers are required to provide flame retardant performance testing reports and anti-static testing reports. Coal mine belts must have the MA coal safety mark to avoid the use of non compliant products;
2. After long-term use (such as in coal mines for more than 1 year), the content of flame retardants and anti-static agents should be regularly tested. If their performance deteriorates, they should be replaced in a timely manner to prevent safety hazards;
3. The joints of the conveyor belt should be vulcanized with "flame-retardant vulcanized rubber", with a joint strength of ≥ 85% of the base tape strength, and the anti-static performance of the joint should be separately tested to avoid the joint becoming a safety weak point.
