Part # Shrink Ratio  Material  Min Supplied ID  Max Recovered ID  Nom Recovered Wall  Temperature  Ratings 
FIT-300-3/4 3:1  SR XLPO  0.75  0.313  0.065  -55 to 125  AMS DTL-23053/4 Class 1, CA Prop 65, RoHS, UL 224 Except Clear 
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1) Tubing Type Dual Wall Heat Shrinkable Tubing
2) Tubing Material Dual Wall Semi-Rigid XLPO
3) Minimum Supplied ID(In) 0.750
4) Maximum Recovered ID (In) 0.313
5) Nominal Recovered Wall Thickness(In) 0.065
6) Nominal Recovered Melt Wall (In) 0.040
1) UL Standard 224 (Except Clear) 125°C / 600 VRMS
2) Other AMS-DTL-23053/4, Class 1 
1) EU Directive 2011/65/EU(RoHS2):
 All materials used in the manufacture of this part are in compliance with European Directive 2011/65/EU regarding the restriction of use of certain hazardous substances in electrical and electronic equipment.
2) REACH Regulation (EC 1907/2006):
 This product does not contain Substances of Very High Concern (SVHC) listed on the European Union's REACH candidate list in excess of 0.1% mass of the item.
Physical & Mechanical Properties
1) Temperature Range -55 to 125°C 
2) Shrink Ratio Approximately 2.5:1 
3) Full Recovery Temperature 135°C 
4) Minimum Shrink Temperature 140°C 
5) Tensile Strength 1500psi, Min ASTM D638
6) Elongation 200%, Min ASTM D638
7) Cold Impact(-55°C) no cracking ASTM D746
8) Heat Shock(250°C,4hrs) no cracking AMS-DTL-23053
9) Secant Modulus 2.5x10 4 psi, Min ASTM D882
10) Longitudinal Change +1%/-10% AMS-DTL-23053
11) Specific Gravity 0.99, Max ASTM D792
12) Shelf Life 3 Years @ 18 to 35°C 
Electrical Properties
1) Dielectric Strength 500 V/mil, Min ASTM D876
2) Volume Resistivity 1x10 16 ohm-cm, Min ASTM D876
Chemical Properties
1) Water Absorption 0.50%, Max ASTM D570
2) Corrosion(0°C,16hrs) no corrosion AMS-DTL-23053
3) Fluid Resistance(23°C,24 Hrs) 1000 PSI, Min AMS-DTL-23053
4) Fungus Resistance Pass AMS-DTL-23053
5) Vacuum Outgassing - CVCM 0.15%, Max ASTM E595
6) Vacuum Outgassing - TML 0.94%, Max ASTM E595
7) Halogen Free Yes 
8) Lead Free Yes 
5X4 FT, 4X6 IN

Our FIT heat-shrink tubing offers a reliable way to protect and seal terminations or add additional mechanical ruggedness. FIT preferred heatshrink products are made from premium compounds under the tightest manufacturing controls. This means FIT will consistently have excellent physical characteristics such as low longitudinal shrinkage and wide temperature ranges while providing an elegant appearance when used alone or on OEM equipment.

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