All Schlegel Electronic Materials' (SEM) fabric-over-foam gaskets are constructed with our unsurpassed, industry leading polyurethane foam core technology.
Within the SEM cladding portfolio—C2, C70, C12, and M80 —you can select from the following foam options:
- Standard, highly resilient UL 94-HB recognized foam (gray)
- Bromine-free flame retardant UL 94-VO recognized foam (blue)
Compression Set:
Standard UL 94-HB and Standard flame retardant UL 94-VO. The core of SEM EMI shielding gaskets is open-celled polyether polyurethane foam in a high-resiliency (HB) formula. Compression set of foam that is encapsulated is 1% at ambient temperature, and <5% at 70° C (158° F) when compressed 50% of free height for 22 hours.
Bromine-free flame retardant UL 94-VO
SEM is the first company to make a UL 94 VO open-celled polyurethane foam bromine free. SEM can help you comply with an impending law banning or restricting the use of brominated flame-retardants in electronic products in order to place them on the EU market. Demands to reduce the risk of bromine flame retardants has been driven in the industry by EU RoHS and WEEE Directives. The Restriction of Hazardous Substances (RoHS) and Wastes from Electrical and Electronic Equipment (WEEE) directives will be implemented in 2004 and will be mandatory in 2006.
Currently, none of the brominated flame retardant chemicals used in SEM EMI gaskets fall under the RoHS restricted use category and require no specific treatment or recycling. However, SEM developed the Bromine-free foam products to ease the declaration process of our customers to EU regulating bodies. By using a non-brominated foam in SEM EMI gaskets, our customers will avoid the long process involved in declaring what manufacturing materials are and are not restricted. This helps our customers get their products to market quicker.
Compression Set:
Compression set for Bromine Free (UL 94-VO) foam: 5% at ambient temperature, and 20% at 70?C (158° F) when compressed 50% of free height for a period of 22 hours. |
