SWFR tubing from TE is a cost effective, highly flame-retardant, 2:1 shrink ratio tubing made of irradiated, cross-linked polyolefin. It insulates and mechanically protects components, electrical connections, and terminations.
SWFR is offered in two very flexible types. X2 is a thin wall tubing, and X4 is a very thin wall tubing. The thicker wall of the X2 offers better protection, while the space-saving thinner wall of the X4 permits denser packing of protected components and a faster shrink time to better protect against thermal damage of temperature-sensitive components. Both types are halogen free, permitting their use in enclosed spaces where toxic gasses from burning materials containing halogens is undesirable.