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Plastics & Elastomers

UV Stabilizers for Engineering Plastics

Engineering plastics like polyamides, polyesters, polycarbonates are majorly used for applications that demand long time U.V stabilization. This selection guide mainly deals with the query "which UV Stabilizer is ideal for which plastic"? This guide will familiarize you with various UV stabilizers used with these engineering plastics. You would be able to find out the functionalities of different UV stabilizers for different engineering plastics in demand. Also one can find the starting point formulations of polycarbonates, polyacetal polyoxymethylene, polyesters like PET & PBT and polyamides.

UV Stabilizers

UV stabilizers combat the degradation that plastics can undergo under the effects of sunlight, UV rays, heat and reaction with oxygen. The changes witnessed in a plastic can range from discoloration to formation of cracks. 

Incorporating a UV stabilizer into the polymer mix,
improves the appearance/aesthetics and
the overall life of the product.
Selection of a UV stabilizer largely depends upon the surface to be protected, envisioned functional life & sensitivity to photodegradation. 
Several engineering thermoplastics like polyamides being majorly used for outdoor applications require long time U.V stabilization. For e.g.polybutylene terephthalate (PBT) finds uses in pigmented automotive exterior applications. Polyurethane based end products like automotive door trims, instrument panels, steering wheels, window sealants, head and arm rests and shoe soles, degrade when exposed to heat and light. Such degradation causes discoloration and formation of cracks.

In this selection guide you will come across different UV Stabilizers that are added to impart typical functionalities to the plastic.

For e.g. Hindered amine light stabilizers are derivatives of 2, 2, 6, 6-tetramethyl piperidine. They are extremely efficient stabilizers against light-induced degradation of most polymers. HALS do not absorb UV radiation, but act as antioxidants to inhibit or slow down the photochemical degradation of the polymer. Significant levels of UV stabilization are achieved at relatively low concentrations as during the stabilization process HALS get generated rather than being consumed. 

Others like benzotriazoles and benzophenones are cost effective and provide better performance than other types of UV stabilizers. Benzotriazoles are widely used in high temperature resins like acrylics and polycarbonates. While benzophenones find applications in polyolefins, PVC, etc.

Overview of this guide

UV Stabilizers for Engineering Plastics

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