40-12mm RMW Medium Wall Heat Shrink Black 1.2m


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Product: 40mm ID to 12mm ID 1.2m Lengths
Heat Shrink – RMW Medium Wall Adhesive Lined Tube

Provides waterproof sealing of cable terminations and joints. Insulation for overhead and underground power cable connections. Insulation of communication cable connections. Waterproofing and environmental sealing of cable glands and connectors. Corrosion protection. Environmental sealing and mechanical protection of pipes and connections.


  • Shrink ratio 3.5:1
  • Dielectric strength 20kV/mm
  • Resistance to chemical, copper corrosion and fungus
  • UV stabilised
  • Operating temperature range -55°C to +110°C
Heat Shrink Tube Circular Dimensions
All Dim mm 
 Part Number
As Supplied After Recovery (mm)
Inside Ø Inside Ø Wall
RMW12 12 ≤ 4 1.7
RMW22 22 ≤ 6 2.0
RMW25 25 ≤ 8 2.2
RMW27 27 ≤ 6 2.2
RMW35 35 ≤ 9 2.2
RMW40 40 ≤ 12 2.2
RMW56 56 ≤ 17 2.7
RMW72 72 ≤ 22 2.9
RMW92 92 ≤ 26 3.0
RMW120 120 ≤ 35 3.0
RMW140 140 ≤ 42 3.0
RMW180 180 ≤ 58 3.0


Heat Shrink Part Numbers for Copper Lug and Link Barrel Insulation
Lug or Link to Suit Cable Size Heat Shrink Part Number
10mm² RMW12
16mm² RMW12
25mm² RMW12
35mm² RMW22
50mm² RMW22
70mm² RMW22
95mm² RMW25
120mm² RMW25
150mm² RMW25
185mm² RMW35
240mm² RMW35
300mm² RMW40
400mm² RMW40
500mm² RMW40
630mm² RMW56



RMW Black
(Not Applicable For Clear)
Testing Method Requirement / Result
Tensile Strength ASTM-D-638 14 N/mm²
Tensile Ultimate Elongation BS 6910-1 12 Mpa
Elongation at Break ASTM-D-638 300 %
Water Absorption BS 6910-1 0.5% 25°C / <1% 50°C
ASTM-D-570 <0.15% Max
Low Temperature Flexibility ASTM-D-792 -55°C No Cracking (Outer Wall)
BS 6910-1 -20°C No Cracking
Secant Modulus BS 6910-1 <250Mpa
Specific Gravity ASTM-D-792 1.4
Longitudinal Change ASTM-D-638 +/-10%
Continuous Operating Temperature   - 55°C to +110°C
Heat Shock at 200°C for 4hrs ASTM-D-2671 No dripping, cracking or flowing
Fungus Resistance ISO 846 Method A Rating 1
Copper Corrosion ASTM-D-2671 B Good
Electrical Strength BS EN 60243 >10kV/mm (Complied)
Dielectric Strength ASTM-D-2671 B >20kV/mm
Dielectric Constant ASTM-D-150 3.0 Max
Volume Resistance ASTM-D-257 1014Ohm/cm



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