UL94 Flammability Standards
Recently a customer inquired about whether or not our Sealed Thermal Switch Meets UL94 rating. UL94 is a flammability standard for plastics (here’s the Wikipedia article). Our individual components, including the sealed thermal switch, meets UL94 and various flammability ratings, although our complete switches as a whole may not be specifically rated for UL94 or any other particular flammability standard. How then do the completed switches stack up to the standard? Well, since I happen to have a Titan soldering torch sitting on my desk, I decided to find out.
The UL rating calls out how quickly the flame dissipates and the likelihood of the plastic spreading the fire as it melts. With Titan in hand (which reaches 2400°F), I set out to see how our 1/2” sealed thermal switch would fair. Here is a .
As you can see in the video the switch takes sustained exposure to very high heat just to ignite the plastic. The plastic stops burning quickly and the melted particles which fell to the paper did not spread the fire. In fact the paper didn’t seem scorched at all. Not a certification, but I’d say our little thermostat did quite well.