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Cold applied tape VS hot applied tape
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Cold Applied Tape: Polyethylene is used as the base materials which are covered by the liquid butyl rubber film. Both of which are pressed and compounded with heat complex technology.
Characteristic:
1. Use butyl rubber as the major components on the adhesive film. Due to the butyl rubber has highly saturation at the molecular structure, and has extremely stability at the chemistry. Moreover, it performs great result in resistance to aging, sealing force, electrical insulation and resistance to high temperature. Therefore, cold applied tape is reliable for the pipeline anti-corrosion. The life of the tape is 40 years underground and underwater, dielectric strength more than 30 KV/MM.
2. During the heat complex process. The film and adhesive melted together on the certain degree of heat, and increase the peel strength between the film and adhesive. As the result, peel strength is greater than 22 N/CM.
3. Customizing the thickness of tape in term of film and adhesive as you want. You can choose the range of the adhesive from 0.1mm to 1mm and the range of the film from 0.2mm to 1mm.
4. Ease of construction: as long as keeping the temperature of tape more than 50C, you can wrap directly to the pipeline under the operation temperature from -30C to 80C.
Hot applied tape: Polyethylene is used as the base materials which are covered by the liquid bitumen film. Both of which are coated with hot melted paint technology.
Characteristic:
1. the cost of the adhesive of hot applied tape is lower than cold applied tape, so it may has greater thickness than cold applied tape. However, it is extremely hard to control thickness of the adhesive in equilibrium.
2. The adhesive of the bitumen will totally lose the adhesive and the peel strength under -30C, so the constructor has to heating the hot applied tape up to 70C during the installation. Therefore, it is time consuming and it is costly for the installation.
3. Adopting hot melted paint technology required very high temperature during the processes, so during the coiling process, the tape still remain high temperature. Therefore, the liner is required for hot applied tape. During the installation, constructor has to peel off the liner of the tape before wrapping on the pipeline, and there is wastage due to the liner cannot be recycled and buyer has to pay for the liner when the buyer purchase the tape.
4. Hot applied tape is instability at the chemistry and physics. Under low temperature the tape is brittle and under high temperature is flowable so the range of usage is narrow than cold applied tape. Moreover, the life of the tape is 20 years underground and underwater, dielectric strength more than 15 KV/MM.
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