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SikaSeal®-331

Heat curing seam sealant for e-coat and high temperature powder coat applications

SikaSeal®-331 is a 1-component, cold-applied heat-curing sealant based on acrylic plastisols. It is a flexible sealant especially designed for sealing metals prior to a powder-coating process and e-coating process.  

  • Capable of withstanding baking / curing temperatures up to 230 °C
  • Superior compatiblity with many powder coats and powder coating processes
  • Bonds well to wide variety of substrates without plasticizer migration
  • Outstanding performance of non-sagging properties
  • Very good application and tooling characteristics
 
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PRODUCT BENEFITS

  • Capable of withstanding baking / curing temperatures up to 230 °C
  • Superior compatiblity with many powder coats and powder coating processes
  • Bonds well to wide variety of substrates without plasticizer migration
  • Outstanding performance of non-sagging properties
  • Very good application and tooling characteristics
 

Areas of Application

SikaSeal®-331 is suitable for seam sealing of truck bodies, cabs, and other manufacturing units and cures in the subsequent powder coat baking process. It is suitable for use with e-coated metals. It provides an outstanding finish with a variety of powder coat chemistries.
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

Acrylic Plastisol

Color (CQP001-1)

White

Solid content (CQP576-1)

minimum

95 %

Density

1.42 kg/l

Application temperature

ambient

5 ─ 35 °C

Non-sag properties

Good

Curing conditions

30 minutes at 200 °C

Tensile strength (ASTM D412)

2.5 MPa

Elongation at break (ASTM D412)

250 %

Service temperature (CQP513-1)

-25 ─ 90 °C

Shelf life

9 months A

CQP = Corporate Quality Procedure

A) 23 °C / 50 % r. h.
Technical Information

CURE MECHANISM

SikaSeal®-331 is cured by heat. The cure rate depends on temperature and time of exposure. The most suitable heat sources are convection ovens. The minimum cure temperature is 180 °C at 30 minutes and the maximum heating temperature must not exceed 230 °C.
It is highly recommended to perform tests with original parts to ensure proper curing and function of the bonded part under original conditions.

Application

Application Information

Application

SikaSeal®-331 is applied as dots or in bead form with a recommended diameter of 1 to 6 mm.
The time between application and curing must be as short as possible, since moisture uptake could negatively affect the performance of the process material.
SikaSeal®-331 can be processed between 5 °C and 35 °C with manual, pneumatic or electric driven piston guns as well as pump equipment.
For advice on selecting and setting up a suitable pump system, contact the System Engineering Department of Sika Industry.

Tooling and finishing

Do not use any chemical tooling or finishing agents.

Removal

Uncured SikaSeal®-331 can be removed from tools and equipment with Sika® Remover-208 or another suitable solvent. Once cured, the material can only be removed mechanically. Hands and exposed skin have to be washed immediately using a suitable industrial hand cleaner and water. Do not use solvents on skin.

 

Overpainting

SikaSeal®-331 is suitable for powder coating paint processes and is compatible with light colors. For best results, the time between powder coat application and curing must be as short as possible.
All paints have to be tested by carrying preliminary trials under manufacturing conditions.

STORAGE CONDITIONS

SikaSeal®-331 has to be kept between 5 °C and 25 °C in a dry place. Do not expose it to direct sunlight or other heat sources.
If SikaSeal®-331 is stored at higher temperatures the shelf life will be reduced.

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