Nu-Tech’s large product line has state-of-the-art firewall Feed-Thru products that meet the requirements of the US Department of Defense (DOD-STD-2003) Navsea drawing #803-500127-1313.  We have a proven solution to provide a watertight, vapor-proof seal where cables enter connection/junction boxes and bulkheads.  Our heat shrinkable material compounds meet the requirements of Mil-I-81765/1A and SAE AS81756/1.  Adhesive lined products meet Mil-I-23053/15A requirements, and our heat-resistant body materials exceed the flame retardant requirements of the U.S. Navy.  (American Wire Gauge) (AWG) I.D. Reference Shelf Life REACH SvHC, IP Rating, S4X IP66 Rating, NEMA Type 4X, Dodd-Frank & European RoHS/WEEE & ELV compliant.


Nu-Tech heat shrinkable products are manufactured from specially formulated polyolefin cross-linked compounds allowing these materials to exhibit several unique characteristics:

  • Fast shrinkage upon application of heat above 120°C
  • Continuous operating temperature range from -55°C to 135°C
  • Meets or exceeds standard specifications for Cable Entry Seals (ASTM F1837M)
  • Flame retardant with a flammability rating of non-burning (ASTM D-635)
  • Dielectric strength of 400 minimum, (ASTM D-149) and volume resistivity; Ohm-cm psi (ASTM D-257) 7,880V/mm minimum dielectric performance, (ASTM D-876)
  • Resistant to all known types of corrosion (ASTM D-2671 A)
  • Fungus-growth resistant with a rating of zero (ASTM G-21)
  • Low water absorption percentile maximum 0.1 (ASTM D-570)
  • Good low temperature flexibility with no cracking after four hours at -55°C (ASTM D-2671 C)
  • Excellent heat resistance with no dripping, flowing or cracking at 225°C (ASTM D-2671)
  • Very high tensile strength rubber compound 1,200 to 1,500 psi (ASTM D-412)
  • Slightly heavier than water with a specific gravity of 1.4 (ASTM D-792)
  • Tough yet very flexible with a hardness Shore D: 45+/-5 (ASTM D-2240)
  • High ultimate elongation rating of 250% minimum (ASTM D-412) with more expansion than our competitors
  • Extremely durable with a stiffness maximum of 25,000 psi (ASTM D-747)