Information

Alpha Wire | www.alphawire.com | 1-800-52 ALPHA
Specifications subject to change. For complete specifications and availability, visit www.alphawire.com.
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FIT > FIT Heat-Shrink Tubing
Heat-Shrink Tubing
FIT®-321 Heat-Shrink Tubing
3:1 Shrink Ratio, Dual-Wall XLPO, Adhesive Lined
AMS-DTL-23053/4 Class 3
UL 224
CSA 198
• Thicker wall for increased
durability
• Water-resistant inner
permanent-bonding adhesive
Operating Temperature
• -55°C to +125°C
Shrink Temperature
• 110°C min.
• 110°C full recovery
Material
• Dual-wall flexible polyolefin with
thick-wall adhesive
Color
• Black
Physical Properties
• Tensile strength: 1500 psi
(10.34 N/mm
2
)
• Elongation: 250% min
• Longitudinal change: +1%/-15%
• Flame tested
• Shelf life: 3 years at 18°C to 35°C
Chemical Properties
• Corrosive eect: none
• Fungus resistance: no growth
• Water absorption: 1.0% max
• Fluid resistance: 900 psi
(6.20 N/mm
2
)
• UV resistant
• Lead free
Electrical Properties
• 600 V (UL, CSA)
• Dielectric strength: 300 V/mil
(118 kV/cm)
• Volume resistivity: 10
12
ohm-cm
Availability
See table
Part No.
Supplied ID, Min. Recovered ID, Max.
Recovered
Wall Thickness, Nom.
Recovered Melt
Wall Thickness, Nom.
Inch mm Inch mm Inch mm Inch mm
FIT-321-1/8 0.125 3.18 0.024 0.61 0.037 0.94 0.020 0.51
FIT-321-1/4 0.252 6.40 0.073 1.85 0.047 1.19 0.020 0.51
ST-303-3/8 0.374 9.50 0.118 3.00 0.051 1.30 0.025 0.64
FIT-321-1/2 0.500 12.70 0.157 3.99 0.071 1.80 0.030 0.76
ST-303-3/4 0.748 19.00 0.236 5.99 0.071 1.80 0.035 0.89
FIT-321-1 0.945 24.00 0.315 8.00 0.098 2.49 0.040 1.02
FIT-321-1-1/2 1.575 40.01 0.512 13.00 0.098 2.49 0.040 1.02
Packaged Assortments
Assorted sizes of 6”
(15 cm) lengths
Availability
Part No.
Qty, Cut Pieces at Length
4 ft (1.2 m) 6” (152 mm)
FIT-321-1/8 25 28
FIT-321-1/4 25 20
FIT-321-1/2 5 14
FIT-321-1 5 8
FIT-321-1-1/2 5 5
FIT-321-MS-1 Colors: Black
Size
Quantity
Inch mm
FIT-321-1/8 0.125 3.18 5
FIT-321-1/4 0.252 6.40 5
FIT-321-1/2 0.500 12.70 5
FIT-321-1 0.945 24.00 5