The Underwriters Laboratories test and approve a wide variety of commercial and industrial products submitted by more than 40,000 manufacturers and product developers worldwide. The formal submission process begins by contacting a client advisor, who helps direct the submission toward an appropriate project engineer. The submission itself consists of several items, including a product sample, written description, statement of intended use, list of possible variations, list of components and materials (including alternates), diagrams and/or pictures, any manuals that will accompany the final product, applicant contact information, desired listing information (pending approval), and results of any prior testing by either UL or other testing services. The project engineer uses these items to oversee both initial testing and follow-up reviews.

Included among the products that Underwriters Laboratories typically review are elastomeric compounds formulated for specific uses. The Recognized Component Directory lists all the compounds tested and approved by UL. Available for purchase from UL, this annual directory includes characteristic information (such as hardness, tensile strength, and elongation) on numerous materials in various product categories (such as “Gaskets and Seals”). Thanks to the diversity of our factories, R.L. Hudson & Company can provide you with a wide variety of UL-approved compounds.

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