Polyolefin composition blend for coating battery boxes.

General Features

Thermoplastic powder Thermofix® has been specifically developed to ensure the protection of the steel surface. Properties have been achieved thanks to the special composition based on modified polyolefins. Thermofix® has excellent mechanical strength, resistance to chemicals, salt and pollution in the air. Thermofix® has excellent adhesion to metal. It provides a high degree of electrical insulation, abrasion resistance and impact resistance.

Thermofix® is typically used in a Fluid Bed Powder Coating process, which involves dipping preheated metal parts into a fine powder suspended in an air chamber. Fluid Bed process is used when uniform and drip-less coating is required. This method is very efficient and low cost.

Product specification sheet KPE 03

Powder coverage3 m2/kg at 350 µm
Particle size95% less than 300 µm
Density0,93 g/cm3
MFI 190 ºC, 2,16 kg4 - 8 g/10´
Fluiditylow
Melting point105 ºC

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How to Use

Pretreatment:

The steel surface must be cleaned of grease and other impurities with technical petrol. For better adhesion of the material is recommended to slightly roughen the surface.

Coating:

It is recommended to preheat the metal to a temperature of 280-350° C. Because the preheated metal cools after removing from the oven, it is important to minimize the distance oven – fluid bath. The hot metal is immersed in the powder for 8-10 seconds. Extending the time will not improve the coverage.

For thin layer applications it is suggested to second heat the product after the powder application to temperature of 170-180° C.

The recommended temperatures might need adjustment for specific products, however, the adhesion of the powder is ensured only at temperatures above 150° C. Overheated material can cause color instability.

Cured film properties

Recommended film thickness300 - 1000 µm
GlossISO 281370
Neutral Salt Spray testISO 7253after 1000 hours
cross-sectioned surface (X)loss of film adhesion less than 10 mm from the cut

corrosion under layer of 2-3 mm
undamaged surfaceno adhesion loss
no signs of corrosion
Chemical resistance- acids and alkali
- salts /except peroxid/
- solutions 60 ºC		good
good
good
Adhesionexcellent

Quality guarantee:

The whole production process is carried out under strict quality control standard per ISO 9001:2000.

Application Method

Thermofix® is typically used in a Fluid Bed Powder Coating process, which involves dipping preheated metal parts into a fine powder suspended in an air chamber. Fluid Bed process is used when uniform and drip-less coating of 300 – 600 microns is required. This method is very efficient and low cost.

Major advantage of the fluid bed method is a waste-free 100% usage of the powder, which is either melted onto the product or remains in a bath. The ability to coat several products at once by immersion in a fluid bath makes this method very efficient. Truly low-tech technology that does not require a lot of interventions or adjustments.

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