The formation of alloys with most metals leads to a reduction in the melting point of platinum, especially in the case of the low-melting metals tin, antimony and bismuth. Thus, it is possible that even with low concentrations and at moderate temperatures the melting point can be exceeded in localized areas which results in the destruction of the apparatus (see table "Melting Themperatures of Low-Melting Precious Metal Alloys").
It should be noted that, due to thermal decomposition and especially under reducing conditions, chemical compounds can dissociate and release these detrimental elements. Therefore, to avoid reduction, heating processes and ignitions shoud be carried out in oxidizing atmospheres, i.e. in open cruicibles. In this context it should be especially noted that hydrogen may be picked up by platinum at 400°C, diffuse through the walls of equipment at higher temperatures and can reduce the material contained within.