SikaMelt®-285 Primer

Hot melt primer for foam injected panels

SikaMelt®-285 Primer is a thermoplastic hot applied primer product with 100 % solids content. It is formulated as an adhesion promoter for foam injected panels.  

  • Solvent and Isocyanate free
  • Good adhesion on metals and plastics
  • High cohesion
  • Very high heat resistance
  • Good hydrolysis resistance
 
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PRODUCT BENEFITS

  • Solvent and Isocyanate free
  • Good adhesion on metals and plastics
  • High cohesion
  • Very high heat resistance
  • Good hydrolysis resistance
 

Areas of Application

SikaMelt®-285 Primer is used to give improved adhesion of injected foams to coated and bare metallic and various plastic surfaces. The product is designed as an alternative to isocyanate primer systems used for foam injected panels. SikaMelt®-285 Primer is not suitable for substrates containing monomeric plasticizer. This product  is suitable for experienced professional users only. Test with actual substrates and conditions have to be performed to ensure adhesion and material compatibility.  

Product Details

Typical Product Data
Chemical base

Thermoplastic rubber

Color (CQP001-1)

Light honey color, clear or opaque

Cure mechanism

Physical hardening

Density

1 kg/l

Viscosity (by Brookfield)

at 190 °C

7 000 mPa·s

Softening temperature (CQP538-5)

132 °C

Application temperature

 

short term max. 1 hour

170 ─ 190 °C

200 °C A

SAFT (CQP560-1)

100 °C

Coverage

30 – 50 g/m2

Shelf life

12 months

CQP = Corporate Quality Procedure

A) only valid for nozzle

Technical Information

CURE MECHANISM

SikaMelt®-285 Primer is a physically hardening primer.

CHEMICAL RESISTANCE

SikaMelt®-285 Primer is resistant to aqueous surfactant solutions, weak acids and caustic solutions.

The chemical resistance is influenced by several factors such as chemical composition, concentration, period of exposure and temperature. Therefore a project related testing in case of chemical or thermal exposure is required.

Application

Application Information

Surface preparation

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.

Application

SikaMelt®-285 Primer is applied directly on the substrate. It can be applied as film or by spray application.

For automated applications a suitable filter system is required.

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

en_PNG_01-diagram-sikamelt-285-primer

Diagram 1: Viscosity as function of temperature

 

During breaks SikaMelt®-285 Primer 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 guarantee 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.

Removal

SikaMelt®-285 Primer 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.

STORAGE CONDITIONS

SikaMelt®-285 Primer 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.