Form This specification covers non-silicone synthetic rubber sealing compounds curing to elastomeric materials. Application These products are used primarily for sealing aircraft firewall structures against passage of air@ vapors@ and flames but usage is not limited to such applications. The sealing compounds are effective at all temperatures from -65 to 400 ??(-54 to 204 ?? and are able to withstand flash temperatures of up to 2000 ??(1093 ??. Sealants qualified to this specification are defined as flame tolerant in accordance with AS5127/2 and are able to prevent flame penetration from incidental exposure to smaller fires. Users should evaluate their specific flame-resistance requirements prior to specifying any firewall sealing compound. Classification None. Safety - Hazardous Materials Shall be in accorrdance with AS5502 (1.1).