Heat shrink cuffs
Such a cuff is a cut of two-layered heat shrinking tape made of a thermal-light-stabilized base layer, sewn and oriented polyethylene, and a hot-melt adhesive layer.
The cuffs are supplied in a package that includes: a tape, lock tape and two-component epoxy primer.
| Ratio | Standard | |
|---|---|---|
| Therma STMP Cuff | ThermoRadMST Cuff | |
| Appearance | The tape should not have blemishes (ruffles, bubles, clefts, breaks, punctures, non-uniformity of the adhesive coat). | The tape should not have blemishes (ruffles, bubles, clefts, breaks, punctures, non-uniformity of the adhesive coat). |
| Adhesion of the tape to the primed steel and polyethylene covering at a temperature of (20±5) C, minimum, N/cm wide | 35 (50)* | 70 |
| Relative elongation at rupture of the base tape lengthwise, % minimum | 200 | 200 |
|
Shrinkage allowance lengthwise, % maximum (minimum) |
15 (30) | 20 (30) |
|
Adhesion of the tape to the primed steel after 100 h of exposure to water, N/cm wide, minimum, at a temperature of (20, 40, 60)º C. for pipes of the following diameter: up to 820 mm inclusive (over 820 mm) |
3,0 (3,5) | - |
|
Adhesion of the tape to the primed steel after 100 h of exposure to water, at a temperature of 60º C, N/cm wide, minimum: |
- | 50 |
|
Transition resistance of the coating in a 3% solution of NaCl at a temperature of (20±5)ºC, Om x m2, minimum: initial (after 100 days of testing)
|
1010 (109) | 1010 (108) |
|
Coating impact resistance, J, minimum, at a testing temperature in between minus (40±3)ºC to plus (40±3) for pipelines of the following diameter: up to 273 mm inclusive up to 530 mm inclusive up to 820 mm inclusive > 820 mm |
4 6 8 10 |
- |
|
Coating impact resistance, J, minimum, at a temperature of: - (30±3)ºC minimum - (20±3)ºC minimum - (50±3)ºC minimum |
- |
8 4 2 |