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SikaPower®-320

Heat curing powder-coating sealant

SikaPower®-320 is a one-component, cold-applied, heat-curing sealant based on epoxy resin and polyurethane. It is developed for sealing applications directly before powder or stove enamel coating and cures with the paint in the oven.  

  • Heat-curing one-component sealant
  • Compatible with powder-coat baking oven conditions up to 220 °C
  • Good and easy applicability
  • Very good gap-bridging capabilities
  • Adheres well to oily substrates
  • Does not contain solvents or PVC
 
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PRODUCT BENEFITS

  • Heat-curing one-component sealant

  • Compatible with powder-coat baking oven conditions up to 220 °C

  • Good and easy applicability
  • Very good gap-bridging capabilities
  • Adheres well to oily substrates
  • Does not contain solvents or PVC
 

Areas of Application

SikaPower®-320 is suitable for sealing applications of various types of metals and can be used in combination with spot welding, riveting, clinching and other mechanical joining processes. SikaPower®-320 can be applied on oily substrates and can absorb superficial oil (up to 3 g/m2) during the heat curing process. This product is suitable for experienced professional users only. Tests with actual substrates and conditions have to be performed ensuring adhesion and material compatibility.  

Product Details

Typical Product Data
Chemical base

Epoxy-Polyurethane

Color (CQP001-1)

Grey

Density (uncured)

1.5 kg/l

Application temperature

20 ─ 40 °C

Curing conditions

30 minutes

180 °C

Shore A (CQP023-1)

65 A

Tensile strength (CQP580-5, -6 / ISO 527)

4 MPa A

Elongation at break (CQP580-5, -6 / ISO 527)

150 % A

Shelf life

6 months

CQP = Corporate Quality Procedure

A) 23 °C / 50 % r.h.

Technical Information

CURE MECHANISM

SikaPower®-320 is cured by heat. The cure-rate depends on the temperature and the exposure time. The most common heat sources are convection ovens.

The temperature window for curing is between 160 °C and 220 °C (substrate temperature). The maximum exposure time at 220 °C is 30 minutes and must be observed.

The temperature and the duration of exposure to heat influence the final properties of the product. Therefore, preliminary tests with original parts under real curing conditions must be carried out to ensure proper curing and function of the sealant.

Application

Application Information

Application

SikaPower®-320 can be processed with pneumatic or electric driven piston dispenser as well as pump equipment.

To reduce extrusion force, the product viscosity can be reduced by heating the unipacks up to 40 °C prior to the application.

After application, the maximum exposure time is 7 days at 23 °C / 50 % r.h. If the product is not heat-cured within the maximum exposure time, blisters may form in the paint.

For advice on selecting and setting up a suitable pump system, contact the System Engineering Department of Sika Industry.

 

Overpainting

SikaPower®-320 is suitable for powder-coating painting processes and is even compatible with very light colors. The Product is non-conductive and does not feature e-coating paintability.

Wash-out resistance before curing is limited to low-pressure washing.

Preliminary tests for process and paint compatibility are required.

STORAGE CONDITIONS

SikaPower®-320 has to be kept between 5 °C and 25 °C in a dry place.

After opening of the packaging, the content has to be protected against humidity.

If SikaPower®-320 is stored at higher temperatures the shelf life will be reduced.

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