Materials and Processes by Barrie D. Dunn

Author:Barrie D. Dunn
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

5.15.4 Removal of Silicone Polymers

It is generally difficult to completely remove liquid silicones from metallic surfaces.

In the case of uncured liquid it is advisable to begin cleaning before any polymerization takes place. This takes place quickly when the liquid is in contact with air. White spirit is quite effective; it has a high flash point and is not very volatile. Experts advise that wiping with a cloth soaked in isopropyl alcohol (IPA) gives the best results. As IPA is flammable, benzyl alcohol is an alternative but is slightly toxic.

Fluorosilicones, being a separate family of materials, require the use of polar solvents. Here, methyl isobutyl ketone or methyl ethyl ketone is recommended.

Methylene chloride may be suitable to remove cured low molecular silicones.

Other, cured solid silicones may be mechanically removed by peeling [this is possible for some conformal coatings (Dunn and Desplat 1994)].

Two special removal agents are also available: DIGESIL from C&M Research Ltd., Enfield, UK (or from Merck in other countries), and

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