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UL Recognized Materials for UL Certified Designs

Streamlining productivity. Reducing cost.Selecting materials that carry Underwriters Laboratories (UL) recognition is a step towards applying the UL label on your final product. The UL symbol is recognized and respected globally, and often required for electronic modules and assemblies that target applications in automotive, consumer electronics, power electronics, lighting and industrial and energy.

Dow Corning has worked closely with UL on behalf of customers to ensure many of its adhesives, encapsulants, coatings, thermoplastic elastomers and thermal management materials receive recognition under important UL test standards, such as UL 94, UL 746 (A-E) and others.

UL 94 evaluates the flammability of plastic and silicone materials intended for parts in devices and appliances. It classifies silicones according to how long they burn in various orientations and thicknesses. The most commonly sought classifications range from V-0, for the most flame-retardant materials, to V-2 for the least. Additional less stringent classifications under UL 94, including HB, 5VA and 5VB, allow for longer burn times.

UL 746 evaluates select characteristics of polymeric materials, and encompasses sub-sections defining short-term properties (UL 746A), long-term properties (UL 746B), use in electrical equipment (UL 746C) and specific material forms (UL 746E), such as conformal coatings.

Evaluations under UL 746B are particularly important as they establish the relative temperature index (RTI) of materials including silicones. RTI specifically estimates the temperature at which a material can perform for ten years before losing 50 percent of its important physical or electrical properties. Due to their intrinsically high thermal stability, many Dow Corning® silicones have achieved recognition and demonstrated outstanding reliability under the UL 746B, which may both contribute added value to your final electronic product.

If you wish to learn which Dow Corning products have received UL recognition, or if you would like us to seek UL recognition for a certain material, then contact your Dow Corning representative today.

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