·2、flame retardancy：
（1）roller: surface temperature of roller is no more than 325℃
（2）blowtorch burning: the average time of burning without flame is no more than 3.0s, the average of cover is no more than 5.0s.

·3、surface resistance：
The average value of upper and below conver is no more than 3.0×108Ω

·4、safety property

The conveyor belt has passed the flame-retardant test and static test and earned the certification of coal signs and customer recognition.

·5、mechanical property

　　Good mechanical propery, and offer the long service life and economical installation.

　　The longest service life: the life of belt body is decided by the factors below. The close-grained belt core made of longtitudinal and horizontal filamnets and knited cover cotton; PVC materials with unique design makes the core and cover coat form the strong adhesive strength; the cover coat with unique design makes the belt to be resistance, tear and abrasion resistance.

The product with whole core fire-retardant owns the advantages of wear-resistant, anti-static, waterproof, fire-retardant, high strength, excellent safety performance, low cost and price compared with the other fire-retardant conveyor belt. It is one of the popular fire-retardant conveyor belt at home and abroad at present. It is especially suitable for the coal mine which do not have the lage underground slope.

·6、product structure：
This product adopts the whole core as the framework materials by dipping and hanging and is made of PVC materials with good anti-static, flame-retardant properties.

·7、tie-in property：
According to the strength of belt bosy and structure of belt core connected by mechanical bucket, the strength can be the 50%-90% of the belt body; connected by vulcanized tie-in the strenght can be the 60%-90% of the belt body. Various connect ways of tie-in satisfied with customers to protect the security of the system and highly efficient operation.

Average value of surface resistance

≤3×108Ω

Roller’s attrition property

Allowed maximum temperature ≤325℃ and no phenomenon of flaming combustion or non flaming combustion.

Alcohol torch burning test

Average value ≤3S (with cover), single value ≤10S(with cover), average value ≤5S (without cover), single value ≤15S(without cover)

Propane laneway burning property

Unburned reserved length >250mm

High-energy laneway propane burning test

Whole width without damaged length >2250