UL 224 standard specifies requirements, including flammability, for insulating tubing, which is usually round in cross-section and consists entirely of extruded components. These requirements also cover heat-shrinkable and crosslinked tubing.
UL (Underwriters Laboratories) is a global organization focused on ensuring that products meet the requirements of various manufacturers, retailers and consumers, as well as the requirements of other regulatory organizations. Over the past hundred years, UL has developed more than a thousand safety standards to protect consumers. The organization regularly tests millions of products to ensure safety and quality.
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