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SikaPower®-4508

Heat curing paint-shop adhesive and sealant

SikaPower®-4508 is a 1-component, cold-applied heat-curing adhesive and sealant based on flexibilized epoxy resin. As a sealant, it is especially designed for sealing on e-coated surfaces prior to a paint or powder-coating process.  

  • Adheres to e-coated and oily metal 
    substrates
  • Suitable for powder-coating processes
  • Good tooling properties
  • Compatible with spot welding
  • Does not contain solvents or PVC
 
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Product Details

Typical Product Data
Chemical base

Epoxy-Polyurethane

Color (CQP001-1)

White

Density (uncured)

1.5 kg/l

Application temperature

20 – 50 °C

Curing conditions

at 180 °C

25 minutes

Tensile lap-shear strength (CQP046-9 / ISO 4587)

10 MPa A, B, C

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

12 MPa C

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

40 % C

Young's modulus (CQP580-5, -6 / ISO 527)

300 MPa C, D

Shelf life

9 months E

CQP = Corporate Quality Procedure

A) on 0.8 mm steel DC04

B) adhesive layer 0.3 mm

C) tested at 23 °C / 50 % r.h.D) elongation range 0.05 – 0.25 %E) stored at 5 – 25 °C
Technical Information

CURE MECHANISM

SikaPower®-4508 is cured by heat. The curing depends on both temperature and elapsed time. The most suitable heat sources are convection ovens. The minimum heating temperature is 160 °C, while the maximum must not exceed 220 °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

In unipacks, SikaPower®-4508 can be applied with electric or pneumatic driven piston-operated guns. To improve application properties (extrusion force, cut-off string, etc.), it is recommended to heat up the unipack to 50 °C.

The adhesive can be applied in form of a round bead. If SikaPower®-4508 is used as an adhesive, join the parts as soon as possible to avoid moisture pick-up.

To avoid excess moisture uptake in an uncured state, which can lead to blistering, perform the curing process within 24 hours after the application. If not possible, perform a pre-curing process.

 

Pre-curing

To improve wash-out resistance SikaPower®-4508 shall be pre-cured for 5 minutes at 160 °C; to reduce moisture uptake (e.g., in case of shipping before full curing) or to reach handling strength the product shall be pre-cured for 15 minutes at 160 °C.

After the pre-curing process, complete the curing with a second heating process.

Overpainting tooling finishing

For tooling purposes, use small quantities of Sika® Tooling Agent N. The joint must be dry after the tooling and prior to the curing or pre-curing process.