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Etching Solution for Fluoroplastic

IP.com Disclosure Number: IPCOM000074110D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Gonnella, NT: AUTHOR

Abstract

Fluoroplastics may be adhesive bonded or plated provided the surface to be treated has been etched. A solution of lithium aluminum hydride and anhydrous cobalt chloride in tetrahydrofuran will etch fluoroplastics at room temperature without the hazard or toxicity of many alternative solutions.

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Etching Solution for Fluoroplastic

Fluoroplastics may be adhesive bonded or plated provided the surface to be treated has been etched. A solution of lithium aluminum hydride and anhydrous cobalt chloride in tetrahydrofuran will etch fluoroplastics at room temperature without the hazard or toxicity of many alternative solutions.

A solution was made by adding 0.5 gm of lithium aluminum hydride to 250 ml tetrahydrofuran while stirring the solution. Anhydrous cobalt chloride was added to another 250 ml quantity of tetrahydrofuran. Since cobalt chloride has limited solubility in tetrahydrofuran, a few grams easily saturate the tetrahydrofuran solution. This saturated solution is added to the lithium aluminum hydride solution. The combined solution turns black and is ready for use in the etching process.

A clean piece TEFLON* material placed in this solution takes on a blue color. Upon coming in contact with air and/or being rinsed in water, the piece changes to the tan color of the etched material. The longer the material is subjected to the solution, the deeper the etch. * Trademark of E. I. du Pont de Nemours & Co.

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