Double Layer Up to 35kV Shield Protection

WDWT Semi‑conductive / Insulation Double Layer Shrinkable Tubing

Made from heat shrinkable insulating material and heat shrinkable semi‑conductive material via special processing. The inner layer provides excellent insulation, while the outer layer ensures reliable shield protection. Ideal for power cable straight joints (up to 35kV) and other applications requiring both insulation and shielding.

Material: cross‑linked polymer

Operating temperature: -40°C to 100°C

Shrink: starts at 100°C, fully at 130°C

Color: black

Suitable for straight joints and shield termination

Dimensions & Packaging

As supplied inner diameter, after recovery ID, total thickness, and length options

Size (mm)	As supplied ID min (mm)	After recovery ID max (mm)	Total thickness (mm)	Length
30/11	≥30	≤11	5.0±0.3	300‑1200 mm (custom cut)
35/13	≥35	≤13	5.0±0.3
45/16	≥45	≤16	5.0±0.3
55/20	≥55	≤20	5.0±0.3
65/27	≥65	≤27	5.0±0.3
88/32	≥88	≤32	7.0±0.3
100/40	≥100	≤40	7.0±0.3
120/47	≥120	≤47	7.0±0.3

*Length can be cut according to specific requirements (300‑1200 mm per piece).

Technical Data

Inner insulation layer and outer semi‑conductive layer properties

Inner Insulation Layer

Property	Test Method	Standard Value
Hardness (Shore A)	ASTM D2671	≤90
Tensile strength (MPa)	ASTM D2671	≥12
Elongation (%)	ASTM D2671	≥300
Volume resistance (Ω·cm)	IEC 93	≥1×10¹⁴
Water absorption (%)	ASTM D570	≤0.5

Outer Semi‑Conductive Layer

Property	Test Method	Standard Value
Hardness (Shore A)	—	≤90
Tensile strength (MPa)	ASTM D2671	≥12
Elongation (%)	ASTM D2671	≥300
Volume resistance (Ω·cm)	IEC 93	1×10² – 1×10³

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Double layer construction ensures both high insulation resistance and effective shielding for medium voltage cables up to 35kV.