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Conveyor belts for underground application

Fire resistant belts Depreux are intended for operation in underground mines excavating flammable and non-flammable minerals, in methane or non-methane areas, classified to “a”, “b” and “c” of methane explosion category and in the excavations classified to “A” and “B” of coal dust explosion hazard.

They meet high requirements related to heat resistance, anti-static electricity and safety in accordance with the requirements of the Stage Mining Authority (WUG) in Poland what is confirmed with documents approving belts for use.

Fire resistant belts meet also international requirements as : 

  • EN14973 in Europe
  • MSHA in the USA,
  • VVUU Czech Republic, 
  • etc.

DEPREUX develops three types of mutiply belts for underground applications : 


Belt carcass is made of 2 to 5 plies and it ensures : 

  • high strength of vulcanized and cold glued splicing,
  • high tear resistance
  • good flexibility and proper centerting in the trough. 


As polyster straight warp belt, we develop the FIRESHIELD (DX FLEX MSHA). 

The carcass is composed of one or two plies straight-warp, protected on both top and bottom sides by weft lines in textile as shown in the drawing below cons. The straight warp is composed of thick twisted (textile cables) in polyester. This warp is inserted between two planes of weft textile made of thick twisted in polyamide. The warp and the weft are connected by a small fine wire which ensures the maintenance of textile. The carcass frame thus constructed is adhered RFL and may be coated of different types of rubber cover, anti- abrasive (X, Y, SH, etc…) and other.

FIRESHIELD / DX FLEX conveyor belting, is thinner in construction in order to reduce the required minimum diameter of the pulleys in the conveyor system. Reducing the physical size of the pulleys making for easier installation—an advantage in restricted areas such as those often required in tunnel and mining applications. The smaller required sizes also reduce the costs of the pulleys. Reducing the size of all of the pulleys throughout the conveyor system can dramatically reduce the overall costs of the conveyor.

Polyesther straight-warp carcass has an alternative with a layer of aramid: DX-FLEXAMID belt is composed of a «straight-warp» carcass formed with a layer of aramid straight chain fiber yarn, with two layers in the weft direction, upper and lower polyamide textile fiber yarn. The yarn of the warp and weft are connected with a bonding polyamide yarn to ensure a strong construction.

The main feature of this belt is that it is the lightest and the thinnest in all textile and steel options ; thanks to the properties of the aramid yarn which has 3 times more strength (or tenacity) than a polyester yarn for the same weight , and roughly three time less elongation. Compared to steel construction, it is naturally much lighter, and its elongation is in the same order of magnitude as steel.

As solid woven belt, we developp two kind of belt : PVC and PVG/FIREMASTER

The FIREMASTER or PVC belts are made of a textile «solid-woven» carcass, impregnated with special PVC. The carcass is then protected with special anti-abrasion rubber (PVG belts) or PVC covers.

Main mechanical properties: The «solid-woven» textile is made of polyester (E) yarns in the warp direction to minimize the stretching of the belt, and of polyamide (P) yarn in the weft direction for good belt flexibility.

A major advantage over ply belts is that Solid woven belts need smaller drum diameters. The advantage over steel-cord belts is that PVC/FIREMASTER belts usually need less power to function.

As Steel cord belt, we develop the FIREMASTER ST.

This belt is composed of:

  • Steel Cables placed at a constant pitch across the width of the belt.
  • A special rubber-bonding layer to the cables and to the rubber covers.
  • Top and bottom rubber covers.

Steel cord bets are preferred to textile or solid woven belts in the following situations : 

  • when the required tensile strength is high and the conveyor is narrow. The superior troughing capabilities of steel cord belt are suited to conveyors typically found in long overland conveyor systems, such as those between a mine and a power plant or steel works or tunnelling projects
  • when a very low elongation of the belt is required.
  • when the life expectancy for the belt is the prime objective.