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This tubing meets or exceeds MIL-I-23053/1 Class 1 & 2. It shrinks down 50% of its supplied inside diameter, upon exposure to heat of 150°C/302°F - will remain elastomeric - with no cracks. Longitudinal shrinkage +5% to -10% upon complete shrinkage.Will protect solder joints, terminals, fittings, pipes, used for harnessing and jacketing wire. Medical equipment, etc. Resists corrosion, chemicals, flame; the tubing has good mechanical and electrical strength.