Which is more fire-resistant: PVC tarpaulin or PE tarpaulin?

Differences in the fire resistance principles of PVC and PE tarpaulins

1. PVC tarpaulin inherently possesses flame-retardant properties

PVC (polyvinyl chloride) is a chlorine-containing synthetic resin.  The chlorine element in its molecular structure releases flame-retardant gases (such as HCl) at high temperatures, forming a protective layer that isolates oxygen and thus inhibits combustion. According to the national standard GB8624-2012, high-quality PVC tarpaulins can achieve a B1 fire resistance rating (difficult to ignite material), self-extinguishing within 3 seconds after removal from the flame, with no flame spread.

In addition, PVC coated fabrics are made by applying a PVC layer containing flame retardants to the surface of a base fabric (such as polyester or fiberglass) through a special process, further enhancing fire resistance. For example, fire-resistant isolation fabrics and welding protection blankets commonly used in the fire protection field use this type of material.

2. PE tarpaulin is flammable but can be improved with additives

PE (polyethylene) is a hydrocarbon and is inherently flammable. When burning, it produces molten droplets, accelerating the spread of fire. Ordinary PE tarpaulins only have a B2 fire resistance rating (flammable material) and require external flame retardant treatment to reach the B1 standard. However, the process of combining PE base material with flame retardants is complex, and the actual effect is greatly affected by the thickness and uniformity of the coating.  It is also prone to failure due to wear or aging after long-term use.

Fire resistance performance comparison

1. Burning speed test

PVC tarpaulin: When ignited directly with a lighter, the flame is dark yellow, and the fabric quickly carbonizes upon contact, self-extinguishing within 3 seconds with no continuous burning.

PE tarpaulin: It burns immediately upon contact with an open flame, the flame is blue, accompanied by molten dripping, requiring continuous pressure to extinguish, and leaving charred holes after burning.

2. High-temperature resistance

PVC coated fabric: It can withstand temperatures up to 180℃ for short periods, and short-term contact with high-temperature objects (such as welding sparks) will not cause open flames. PE tarpaulins:  With a softening temperature of only 80℃, they are prone to deformation or even melting in high-temperature environments, posing safety hazards.

Matching fire protection needs in practical application scenarios

1. Advantages of PVC tarpaulins

Industrial fire protection: Such as logistics warehouses and construction sites, requiring covering flammable goods or isolating high-temperature work areas.

Fire emergency response: Temporary fire isolation zones, protective covers for rescue equipment.

High-temperature environments: Covering areas around boiler rooms and smelters; PVC-coated fabrics can withstand residual heat from equipment.

2. Applicable scenarios for PE tarpaulins

Low-risk covering: Temporary rain protection, protection of agricultural products from dew, without the need for long-term fire protection.

Cost-sensitive projects: Short-term event tents, simple rural storage; PE tarpaulins cost as little as 1/3 of PVC.

Conclusion

From a fire protection perspective, PVC tarpaulins have inherent flame retardancy and mature manufacturing processes, making them the preferred choice for high-risk scenarios; while PE tarpaulins rely on additives for limited fire protection and are more suitable for low-cost, low-risk scenarios.