What is the bending radius? What is EPDM? What is a performance level? Here are the answers to these & other questions!
An abrasion test is a test used to determine the resistance of a material to wear caused by sliding contact such as rubbing, grinding or scratching. An abrasion test can also be referred to as a wear test, an abrasion resistance test, or simply a resistance test. These tests ensure the durability of a hose.
= Burst pressure. The pressure at which the hose bursts in a destructive test.
The bending radius is the radius at which a filled hose can be bent without kinking or otherwise damaging it. The smaller the bending radius, the more maneuverable and flexible the hose is in use.
In circular weaving, there is no specific start or end point. Thus, the Manchon can be woven in the circular loom.
Compressive strength describes the resistance of a material to the action of compressive forces.
Pressure hoses according to DIN 14811 are used to convey extinguishing agents such as water and include both the fire hoses used to manually extinguish and control fires and large diameter hoses used to transport / convey large quantities of water over long distances.
EPDM is a synthetic rubber with a saturated main chain. This rubber-elastic material has a wide range of industrial applications. It has properties such as high weather and ozone resistance as well as high thermal resistance.
The word extrusion is derived from the Latin extrudere 'to push out'. The extrusion process is a form-giving process. A viscous mass is forced through an opening under high pressure and temperature, which gives the shape.
Seamless circular weave pressure body in fire hose.
A fire hose is a pressure hose.
Pressure hose for fire pumps with an increased working pressure of at least 4 MPa, a test pressure of at least 6 MPa and a burst pressure of at least 10 MPa.
Thin outer coating(s) applied to the entire perimeter for better abrasion resistance.
A top layer completely enclosing the fabric (e.g. rubber outer cover).
The impact and abrasion protection - also called protective sleeve - protects the hose at the binding point. It is recommended for hoses of performance levels L2 and L3. The impact and abrasion protection from GH is called GH HOSE GUARD.
Weft and warp threads are alternately on top and bottom. The fabric surface shows a checkerboard pattern. It is characterized by an exceptionally close interlacing between weft and warp threads. Along with twill weave and satin weave, it is one of the three basic weave types.
The elastic inner life of (inner-rubberized) hoses. Produced from a combination of different polymers in the extrusion process (=press-through process).
There are a total of three performance levels. They are part of DIN 14811 and serve the defined quality selection for C and B hoses. The abrasion requirements are:
| Hose size | Abrasion requirement (in rotations) | Abrasion requirement (in rotations) | Abrasion requirement (in rotations) |
|---|---|---|---|
| L1 | L2 | L3 | |
| C42 | 200 | 400 | 600 |
| C 52 | 200 | 400 | 600 |
| B 75 | 80 | 120 | 140 |
Polyester was developed in Great Britain in the 1940s and is highly resistant to tearing and abrasion. The man-made fiber consists of polyethylene terephthalate (PET). Its basic building materials are hard coal, lime, crude oil and natural gas. Polyester is easy to dye.
A hose that can be folded flat or rolled up when unfilled. DIN 14811
World's oldest synthetic rubber. It is resistant to most solvents, acids, alkalis and water.
The pressure held for a specified duration during a non-destructive test to demonstrate the suitability of the hose design.
The word twisting is derived from the Middle High German "zweidrähtiger Faden". Accordingly, a twisted yarn is a yarn twisted together (twisted) from at least 2 threads.
UV resistance describes the resistance of a material or product to UV radiation, which is one of the so-called outdoor weathering factors. Such as temperature, atmospheric oxygen content, ozone, precipitation and environmental pollution.
GH Flatline vulcanization means that the hose is rolled out to its full length. It is inflated with steam for a certain time at a certain temperature. This causes the hose to be flat and pliable. This brings flexibility to the hose and saves space and nerves when rolling it up.
The warp threads are the threads that are stretched lengthwise in the loom. In the finished fabric, they lie parallel to the length of the tube, while the weft threads run crosswise around it.
With the GH 4Z weaving system developed by GH, the -> LS2 and LS3 requirements are achieved without a seriously higher material input - unlike competitor products:
- GH hoses in these performance classes are significantly more supple and flexible.
- The protection of the weft thread also counteracts punctual abrasion and reduced flow rate
- Durable and robust hoses with smallest -> bending radius
In fabric manufacture, the weft threads are the parallel threads of the fabric that run across the warp threads stretched in the loom. The crossing of warp threads and weft threads is called weave linen weave twill weave.
Classic binding type with stainless steel wire for connecting coupling and hose.
Maximum pressure for which the hose is designed.