Flammability Test Equipment UL-94 test equipment

Flammability Test Equipment UL-94 test equipment - Tech Trivial

Posted 2023-05-26 09:49:35

Flammability test equipment is used to determine the flammability of plastic materials for parts in devices and appliances. Flammability UL94 test equipment is available in 3 models.

UL 94 (Underwriters Laboratories test standard UL 94) is one of the most used flammability tests for determining comparative flammability for plastic materials. It measures the ability of sample to extinguish the flame after ignition and its dripping behavior in response to a mini flame or radiant heat source under controlled environmental conditions.

The tests results are intended to serve as a primary assessment of the material’s suitability with respect to flammability for a particular application, such as plastic materials used for parts in electronic devices and appliances.

This test method is used for thin specimen or materials that are too flexible or may distort, shrink or flex during the traditional vertical testing (failure to pass the UL 94 V test is a precondition of all VTM ratings). This test is similar to the vertical burning test except that the material is wrapped around a mandrel before clamping to the stand and the flame application is reduced. In this test, the flame is applied only for 3 seconds.

For any Plastic material to achieve 5V classification, the test samples must not burn with flaming and/or glowing combustion for more than 60 sec after the fifth flame. Also, the test samples must not drip.

Samples molded from the Plastic material are oriented in either a horizontal depending on the specifications of the relevant test method, and they are subjected to a defined flame ignition source for a specified period of time.

A Plastic material having a thickness between 3 and 13mm will be classified as a HB Plastic material if it does not have a burning rate exceeding 40mm per minute. For Plastic material with thickness less than 3mm the burning rate should not exceed 75mm per minute. The Plastic material will also be rated as HB if it ceases to burn before the 100mm mark independent of thickness.

This test grants three different types of ratings depending on burning rates and or afterflame times. A Plastic material will be classified as a HBF Plastic material if it does not have a burning rate exceeding 40mm per minute over a 100 mm span or if ceases to burn before flaming or glowing reach the 125mm mark.

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