Siltem® STM

These materials are developed from the polyetherimides introduced by General Electric (see also Section 18.14.2). At the time of writing one grade, Ultem Siltem STM 1500, is being offered. It is of particular interest as a material for wire and cable insulation, as it not only has excellent flame resistance coupled with low smoke generation but also avoids possible toxic and corrosion hazards of halogenated polymers. This can be of importance where there are possible escape problems in the event of a fire, such as in tunnels, aircraft and marine (particularly submarine) vessels. 

Table 29.6 Some typical properties of a polysiloxane-polyetherimide copolymer (Ultem Siltem STM 1500)...

Poly(dimethyl siloxane) surfactant, 322 Siltem STM 1500 Poly(ether imide), 230 Sintimid ... 

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