Halogen Free Flame Retardant Cable Compounds

The use of silanes in filled polypropylene HFFR compounds affords the same advantages as in other HFFR compounds:

• Increased loading levels
• Effective flame retardation
• Significantly reduced water uptake into the polymer
• Much improved electrical properties
• Improved processability of the highly filled polymers
• Increased throughput during cableproduction
• Improved mechanical properties

Special Multifunctional Silane Systems™ such as Dyansylan^® SILFIN 70 and SILFIN 71 achieve a simultaneous crosslinking of the polyethylene and coupling between the filler and the resin. The Melt-Flow Ratio (MFR) is increased by a factor of at least 4 through use of silanes.

How to Find the Suitable Dynasylan^® Grade

For safety reasons, the use of low flame and low smoke cables is becoming more and more important. These cables are usually based on polymers, such as polyethylene and EVA, and are filled with mineral fillers that release water upon exposure to elevated temperatures.

The result is a cable that, in the case of a fire, produces significantly less smoke, chars instead of melts and thus dramatically reduces fire propagation. Common fillers are aluminum trihydroxide and magnesium dihydroxide. Which is the right silane to choose depends on the polymer matrix.

The choice of Dynasylan^® depends on the ratio of EVA to polyethylene in the polymer mix.