Medium-wall adhesive lined heat shrink tubes with shrink ratio 3:1

type : СТТК (3:1)

  • (TU 2247-021-97284872-2006)
  • Designed for sealing, insulation and corrosion protection in power and telecommunications
  • Extended shrink ratio: 3:1 to 4:1
  • Color: black
  • Thickness of medium-wall tubes СТТК greatly exceeds the thickness of standard tubes ТТК (4:1)
  • Medium-wall adhesive lined heat shrink tubing has exceptional mechanical strength, abrasion resistance and insulating properties
  • Hot-melt adhesive layer is applied on the entire inner surface of heat shrink tubes, by co-extrusion
  • Resistant to UV rays and weather conditions
  • While shrinking, the adhesive layer melts, fills all the irregularities of the microrelief and ensures complete leakproofness of connections
  • Packing: in cutting - 1 m or 1.22 m




Elongation at break point

not less than 350 %

Shrinking temperature

115- 140 °С

Operating temperature

-55 °C to +125 °C

Tensile strength

not less than 10 MPa

Electric durability

at least 20 kV/mm

Operating voltage

Up to 1000 V

Specific volume electrical resistance

1014 Ом/cm

  • Key parameters
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  • Quality certificate (PDF)
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Name Nominal diameter (mm)

Wall thickness after shrinkage (mm)*

The optimal range of shrinkage (mm) Packing
(cutting, m)
(quantity of pieces in a polybag)
Before shrinkage
D not less
After shrinkage
D not more
СТТК-8/2   8 2 1.7 7.2–2.4 1.00 10
СТТК-12/3    12 3 1.8 10.8-3.6 1.00 10
СТТК-22/6   22 6 2.2 19.8-7.2 1.00 10
СТТК-33/8   33 8 2.5 29.7-9.6 1.00 10
СТТК-40/12   40 12 2.5 36-14.4 1.00 10
СТТК-55/16   55 16 2.7 49.5-19.2 1.00 10
СТТК-75/20   75 20 3.0 67.5-24 1.00 5
СТТК-95/25   95 25 3.0 85-30 1.00 5
СТТК-115/34   115 34 3.3 100-40 1.22 5
СТТК-140/40   140 40 3.5 125-48 1.22 5
СТТК-160/50   160 50 3.5 145-60 1.22 5
СТТК-200/55   200 55 3.5 180-66 1.22 5


* Thickness of the tube wall after shrinkage is given without taking into account  thickness of adhesive layer


Medium-wall adhesive lined heat shrink tubes CTTK - a special kind of high-class medium- wall adhesive lined tubes with extended shrink coefficient from 3:1 to 4: 1, designed for insulation, corrosion protection and sealing of contact joints.

CTTK (KBT) tubes wall thickness is almost two times more than ТТК 4:1, which provides exceptional mechanical strength and resistance to abrasive deterioration

The extended shrinkage factor allows the use of heat shrink tubing CTTK for installation on cables and twists with complex reliefs and with even greater level differences, than in the case of TTK 4:1.

Whole nner surface of the tubes CTTK is evenly coated with a layer of hot melt adhesive, by coextrusion. Its presence provides a reliable seal of the contact connections and gives them additional mechanical strength after shrinkage.

Melting and filling all the irregularities of the microrelief by hot-melt glue makes the cable assembly as monolithic leakproof structure. Due to a specific composite, including Eva (ethylene vinyl acetate), provides excellent adhesion to many surfaces and materials.

These properties make CTTK (KBT) tubes extremely popular for mounting on profiles with complex shapes and/or in the presence of special requirements for leakproofness and protection against mechanical stress.

This group of adhesive lined tubes is issued in black color and possesses high stability to ultraviolet and weather conditions. The form of delivery of a heat shrink tubes CTTK differs in variability of lengths, depending on its sizes – tubes from 8/2 to 95/25mm inclusive are delivered in cutting - 1 meter length, and from 115/34 to 200/55 –  1,22 meters length.

The quantity in the package also depends on the diameters (up to size 75/20mm in one package there are - 10 tubes, and all other sizes – by 5 pieces).

CTTK (KBT) tube is not the first year, successfully used in a number of industries when performing electrical work for marking and banding wiring, assembly and anticorrosive protection of contact connections.