LSZH Cross linked

Family: Elastomeric

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Use: Insulation and Sheathing on LSZH cables

General characteristics

Modern cable innovations have brought forth an increased emphasis on fire performance. As a result, there are stringent requirements for low smoke emissions, reduced corrosivity when burnt, flame retardance, and limited propagation in various cable installations. Consequently, halogenated compounds have largely been phased out in favor of LSZH (low smoke, zero halogen) alternatives, substantially decreasing the utilization of PVC and chlorinated rubbers in favor of newly engineered LSZH materials.

The elastomeric forms of these compounds typically derive from non-chlorinated polymers, incorporating high volumes of active fillers, with hydrated alumina being the most common. The compounding process can be intricate based on specific applications, and many formulations employ EVA as the foundational polymer. EVA, a copolymer of ethylene and vinyl acetate, features VA contents ranging from single-digit percentages to upwards of 70% or 80%. Lower percentages largely denote modified polyethylene, whereas greater VA content increases softness and fluid resistance. Other copolymers, such as acrylics and nitriles, are often blended with EVA.

Processing

Elastomeric LSZH is produced with carefully selected fillers, coloring agents, and processing aids through standard compounding methods. The cross-linking process may involve either chemical or radiation methods.

Typically, extrusion is conducted using single screw extruders, and crosslinking occurs via CV, autoclave, or radiation techniques.

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Successful processing of these materials hinges on maintaining good process control.

Uses of material/Cable types

Crosslinked LSZH materials are now commonly employed in applications previously dominated by chlorinated rubbers. They are also increasingly utilized in new scenarios necessitating fire safety, along with requirements for heat and fluid resistance.

Standards

• IEC ' series
• IEC ' series
• IEC -1 and IEC -2
• BS EN
• BS EN
• BS EN ' series
• BS
• BS
• BS
• Def Stan 02-526
• Def Stan 02-527

List of Polymeric materials for cables used:

LSZH Compound

Low smoke, zero halogen (LSZH) or Halogen-free, flame retardant (HFFR) compound represents the primary material used to manufacture safety cables, which are generally polyolefin-based and heavily infused with inorganic hydrated minerals, emitting cleaner smoke when combusted.

Polymer Asia LSZH compound features include:
 Good flame retardant (IEC -3-24 Cat C, Cat A)
 Low smoke density (IEC -2)
 Halogen free (IEC 754-1)
 Heat shock test (IEC -3-1)
 Excellent surface appearance
 Good processability with low head pressure and motor amps
 Remarkable elongation alongside strong tensile properties

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