Phosphating is a chemical process. Due to the comparatively high porosity, phosphate coatings are often utilised in relation with oils, paint or varnishes. Depending on the composition of the phospating bath, thicker or thinner coatings are attained.

Zinc Phosphate coatings have a grey surface and are used with different crystallization according to the operational area.

Coarse-crystalline zinc phosphating generates "heavy" phosphate layers up to 30 g/m². These coatings are very suitable as undercoating for thick varnish layers. On other parts the crystals can be to large. Then they would easily break off when mechanically strained. However, on highly solid materials the phospate crystals get formed smaller (layer weight 10 g/m²), so that these phosphatings can also be utilised well here.

Fine-crystalline zinc phosphate coatings serve as undercoating for varnishes, whereat thinner layers carry less varnish. When oiled, these phosphatings result in a very good corrosion protecion as well.

Micro-crystalline zinc phosphatings are suitable as carrier for organic coatings als varnish, adhesives & rubber coatings and enhance the protection against under-rust.

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Very fine-crystalline and dark grey to back layers at a layer weight of 5 - 25 g/m² mark are a feature of manganese phospate. Due to superb gliding abilities these coatings are utilised for wearout reduction with machine parts, engine or gear parts, als well as for threads.

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The blue to blue/grey, not layer-building iron phosphate generates very low layer weights of 0.3 - 0.8 g/m² und is mostly utilised als temporary corrosion protection or simple primer for varnishes.