Isola is certified in UL Category Code QMTS2. UL File number E41625 Polymeric Materials РFilament-wound Tubing, Industrial Laminates, Vulcanized Fiber, and Materials for Use in Fabricating Recognized Printed Wiring Boards РComponent

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The materials covered under this category are incomplete in certain constructional features or restricted in performance capabilities and are intended for use as components of equipment submitted for investigation rather than for direct separate use in the field. THE FINAL ACCEPTANCE OF THE COMPONENT IS DEPENDENT UPON ITS USE IN EQUIPMENT SUBMITTED TO UL.


This category covers materials that have been tested in accordance with established methods to define their properties in order to facilitate investigation of their use in end-product applications. These materials may consist of filament-wound tubing, industrial laminates, vulcanized fiber, and other materials for use in fabricating Recognized printed wiring boards (PWB).

Filament-wound tubing is a tube composed of continuous monofilaments or yarns with controlled orientation in a matrix of a cured thermosetting resin.

Industrial laminates consist essentially of fibrous sheet materials, such as cellulose paper, glass fabric, etc., which are impregnated or coated with a thermosetting resin binder and consolidated under high temperature and pressure into hard solid products.

Vulcanized fiber is made by combining layers of chemically gelled paper. The chemical compound used in gelling the paper is subsequently removed by leaching; the resulting product is dried and finished by calendering.

Materials for use in fabricating Recognized printed wiring boards are insulating materials upon which a conductive pattern may be formed. They may be industrial laminates or thermoplastic or thermoset polymeric materials in film, sheet or molded form, or insulated metal sheets, with or without a conductive metal cladding.

In those cases where the materials have the same performance characteristics, they are tabulated together as a group with each material designation separated by a comma. The individual Recognitions may include alternate designations as well as materials that are basically similar in composition but differ by some minor variation, such as molecular weight, colorants, etc.

Testing may include the determination of material flammability (burning characteristics), ignition characteristics from various thermal and electrical sources, electrical tracking and other electrical characteristics, physical and mechanical characteristics, and analytical tests. In addition, the effect of long-term exposure to elevated temperature (air-oven aging), water, ultraviolet light, cold, etc. on property retention may be investigated. Levels of performance characteristics required for a particular end-product application are intended to be in accordance with the requirements of the end-product standard. Due to space limitations, only a limited number of property values may be presented in the individual Recognitions. Additional properties may be found in the individual Reports.

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