The relatively modern development in cables has seen the requirement for fire performance become increasingly important. This has seen requirements for low smoke emission, low corrosivity when burnt, flame retardance and reduced propagation become clearly specified and increasingly specified in many areas of cable installation. This has removed halogenated compounds from many markets to be replaced by LSZH &#; low smoke, zero halogen &#; types. This has dramatically reduced the amounts of PVC and chlorinated rubbers used to be replaced by newly developed LSZH materials.
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The thermoplastic versions of these compounds are generally based on polyolefins of some sort with relatively high loadings of active fillers, the commonest being hydrated alumina. Compounding technology can be quite complicated, depending on the application. Many compounds use EVA as the base polymer. EVA is a copolymer of ethylene and vinyl acetate, with VA contents being from single-figure percentages to 70% and 80%. The lower percentages are essentially modified polyethylene, and as the VA content increases, so does the softness and the resistance to fluids improves. Other copolymers are often blended with EVA.
Thermoplastic LSZH is usually compounded with carefully selected fillers, colouring pigments and processing aids using standard compounding practice.
Extrusion is usually with single screw extruders, generally with low compression screws.
Good process control is necessary to succeed with these materials.
LSZH materials are usually used in applications where PVC would historically have been used, such as armoured cables, and in newer applications such as fire alarm and emergency lighting cables.
List of Polymeric materials for cables used:
Contact us to discuss your requirements of lszh compound. Our experienced sales team can help you identify the options that best suit your needs.
LSZH stands for low smoke zero halogen, and this type of cable and wire emits very low amounts of smoke and emits no toxic halogens when exposed to heat. In the past several years, there has been a noticeable increased awareness and demand for these products as environmentally friendly initiatives have popped up all around the globe.
Halogens are chemicals which use an element from the 17th column of the periodic table as one of their components. In wire and cable compounds, the halogen containing ingredients are typically utilized to impart improved flame retardant properties to polymeric materials, with the most common elements used for this purpose being bromine, fluorine, or chlorine.
LSZH cables and wire should be used when there is an increased risk of heat and fire hazard. There are many advantages of using due to the low smoke, environmental, and toxicity benefits. Cables in communication applications are not exempt from catching fire and can produce harmful smoke and gas, so preventative measures have been taken to make sure that cables are safe too, which is why LSZH cables are becoming more widely used.
The clearest uses for LSZH are confined spaces with large amounts of cables in close proximity to humans or sensitive electronic equipment. Submarines and ships are classic examples, which is why the military was one of the first adopters of LSZH standards. Additionally, mass transit and central office facilities are common applications for LSZH, and many telecommunication standards require LSZH cables.
LSZH wires and cables are commonly found in:
LSF (low smoke and fume) cables may sound similar to LSZH cables based on the name, but they are actually different in several important ways. Confusing these two cables could lead to a life threatening situation in the case of a fire. LSF cables are still made using PVC compounds and while they are designed with reduced smoke and hydrogen chloride (HCI) emissions in mind, there are no strict standards in place to confirm the quality of the design. LSZH cables on the other hand are subject to very strict standards regarding the amount of HCI emissions they would give off when burning. For this reason, LSZH cables and wires are generally the safer option.
If you are looking for custom LSZH cables contact us today to discuss the specifics of your order. Quadrangle Products works to ensure all our cable orders are received by our clients and customers quickly and easily. We are also happy to offer custom wire and cable harness engineering support from our experienced engineering team.