Injection Moulding Asia

Halogen-free FRs
Two new non-halogen flame retardant (FR) masterbatches from Clariant Masterbatches are fully melt processable, thus eliminating concerns on colour, physical properties or cost.

Developed for polyester, PP and TPU to meet critical flammability standards for applications in extruded and injection moulded parts, the FRs  are free of bromine, chlorine and heavy metals. However, unlike many other non-halogen FRs, which are based on organo-metallic chemistry, Clariant says its additives do not contain solid particles that can make colouring difficult or expensive and that can diminish important physical properties.

Designed for polyesters, CESA-f/flam 5525NH is able to pass tests such as NFPA 701, MVSS 302 and UL 94 V-0. Applications include mono-filaments, films and injection moulded parts. This masterbatch is fully melt processable and requires a typical dosage in the 6 to 8% range. At these addition rates, it contributes only a slight yellow grey colouring so that bright colours can be achieved in the end product, which is said to be easier than with conventional non-halogen FRs.

CESA-flam CT-1629NH is aimed at PP and TPU for applications in injection moulding, extrusion and fibres, such as those used in office furniture. This masterbatch is specifically designed to pass California TB133 for public seating and motor vehicle standard MVSS 302. Typical addition rates are in the 6 to 8% range. The masterbatch does not affect the colour of the base resin in the part so, in most cases, colouring costs do not change. It is also inherently UV stable so no additional UV additives are needed.