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January 26, — Advices

Chemical stripping: a powerful solution for steel hooks

Greensolv's chemists' mission is to find innovative, environmentally-friendly and cost-effective solutions for the stripping of metal parts of all kinds that are used in industrial assembly lines.

Stripping the hooks used to hold parts to be painted in place is a perfect example of the innovations the company is developing.


Many industrial manufacturing companies use stainless or carbon steel hooks, usually in the shape of a straight C or elongated S to hang bulky parts and hold them in place while they are painted.

Powder or liquid paint applied to the parts eventually accumulates on the hooks, making them unusable. Although these hooks are inexpensive, it is preferable to strip them to extend their life in order to avoid supply difficulties (and stops in the assembly line) and reduce the company's carbon footprint.

Stripping in a Burn-Off Oven

The traditional method of stripping hooks is to insert them into a burn-off oven. The high heat then destroys the structural integrity of the paint, which flakes off the surface of the hook.

This method is effective, but it has its share of disadvantages:

  • Pyrolysis leaves ash-like residues, which can then contaminate the paint line.
  • As stripping occurs, pyrolysis weakens the structural integrity of the hook, whether it is stainless or carbon steel, and its hardness is altered.
  • Pyrolysis requires a lot of energy compared to chemical stripping.
  • This process gives the hook a porous finish, reducing its electrical conductivity and paint adhesion. This increases the costs of painting because it is then necessary to apply more powder or paint for a similar result.
  • Pyrolysis reduces the number of uses of the hook.
  • This stripping process emits a large amount of CO2.

An alternative: chemical stripping

To overcome these drawbacks, Greensolv has developed a high-performance chemical stripping process which is performed in Greensolv stripping tanks.

Here are the advantages over pyrolysis:

  • The stripping time is shorter (less than 2 hours in optimal conditions), compared to that of burn-off ovens (4 to 8 hours).
  • The hooks come out of the tank clean and smooth (non-porous surface).
  • Operating costs are lower, 50% less per square foot stripped.
  • Hooks provide better conductivity and adhesion of the paint. The coating process will require less powder to paint the parts.
  • Hooks can be reused over a longer period of time.
  • The paint line does not get contaminated.
  • The chemical stripping system requires less maintenance, and less energy is required to strip the same surface.

In the end, chemical stripping of hooks is a more practical and economical solution.

Interested in chemical stripping? Contact us!