The test device SPT DIN EN 348 used to test the behaviour of materilas for protective clothing when they are hit by small metal splashes.

A steel wire is pushed into an acetylene-oxygen flame by a motor and melts. The resulting metal drops fall into a funnel, which directs them to the specimen. There is a sensor behind the specimen that measures the impacting metal dropss. The number of drops produced is counted until the temperature on the surface of the specimen rises by 40ºC on this basis, different materials can be compared.