Advanced cleaning and industrial chemical suppliers based in Leicester, UK

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Bonderite® M-ZN 20

Metal Treatment & Aerospace

Product Functions

  • Surface Additive

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Product Uses

Bonderite M-ZN 20 (was Granodine 20) produces a fine grained phosphate coating on iron, steel and zinc surfaces which protects against rusting and underfilm corrosion and provides an excellent substrate for paint or other organic coatings. The zinc-calcium phosphate coating is produced in an accelerated dip process which takes just 2-5 minutes at 60-70C. The Bonderite M-ZN 20 process is suitable for the pretreatment of most ferrous and zinc components including forgings and castings. The multi-stage process is easy to follow and control, and should be observed for best results. It involves pre-cleaning with an alkali cleaner and water rinsing, or solvent vapour degreasing. Rust or scale is removed, and then the item is dipped into the Bonderite M-ZN 20 solution. Rinses in water and Bonderite M-PT 54 NC are followed by a final drying stage. The resulting zinc-calcium phosphate coating has a weight of 2.5-3.5g/m2, and the process is approved to Def Stan 03-11 as an accelerated process (Class II) to meet the requirements of BS 3189: 1991.

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