SikaMelt-255, Removable Hot Melt Pressure Sensitive Adhesive, Interior, 175 kg

Surfaces must be clean, dry and free from grease, oil and dust.
Based on the surface and type of material, a physical or chemical pre-treatment might be required. Type of pre-treatment must be determined by preliminary tests.

With adequate processing equipment SikaMelt-255 can be applied directly or by transfer method. It can be applied as film, dot, bead or spray application. For automated applications a suitable filter system is required.
Due to the better adhesion performance the direct method is usually chosen whenever possible. The transfer method is often used in combination with substrates that are porous and absorbing such as foams or when they are sensitive to high temperature such as thin PE films. To protect the adhesive surface against dust, light and oxygen it is necessary to cover the adhesive film with silicone coated paper or foil.

To meet the required application properties the adhesive viscosity can be adjusted by adapting the application temperature (see diagram 1).

Diagram 1: Viscosity as function of temperature

During breaks SikaMelt-255 is to be processed as follows:
For breaks ≥ 1 h the heating needs to be lowered to 80 °C and for breaks ≥ 4 h the heating needs to be switched off.
To ensure a constant quality during the whole production process it is recommended to protect the adhesive in the melting tank with nitrogen or carbon dioxide (to avoid possible reaction of the product with oxygen).
For advice on selecting and setting up suitable processing equipment contact the System Engineering Department of Sika Industry.

SikaMelt-255 may be removed from tools and equipment with Sika Remover-208 or another suitable solvent.
Hands and exposed skin have to be washed immediately using hand wipes such as Sika Cleaner-350H or a suitable industrial hand cleaner and water.

Do not use solvents on skin.

SikaMelt-255 has to be stored at temperature below 40 °C in a dry place.
For transportation purposes, the storage temperature can be exceeded for a period of max. 4 weeks up to 60 °C.