Project #1
Identify system that will effectively clean machine parts and products which have been contaminated with a mixture of uncured, partially cured and fully cured polysiloxane coating
08/07/2003
Delrin plastic
The parts are used on a machine to hold the products while it is coated. The product is used to make eyeglasses
50% parts, 50% product
5 inch diameter x 3 inch height
Small
Less than 1 lb
Laura Vetro
Machine parts are used during coating application for 1 day -2 weeks before cleaning. Product is coated and cured before cleaning
Machine parts are returned to machine. Product is returned to machine for reapplication of one layer of coating.
3000
30-150
Blackstone NEY ultrasonics, Sweepsonic 2D
Potassium Hydroxide
2.4 N, 500 liters/year
It is only partially effective at removing the polysiloxane coating flakes, particles and films
Machine parts must be clean enough to avoid contaminating the product.
Immersion 10 min, Hose 10 sec
1 month, 2 hours
Surface particle counter
Eleven products were evaluated over three trials. Initially four aqueous products removed nearly all of the coating within the 5 minutes of cleaning. The four semi aqueous products were not as effective, but three still removed over 90%. However, when these products were used on supplied parts, visual inspection revealed little change for all four aqueous cleaners. Kyzen and Florida Chemical caused a change in the appearance of the lens. The pot ash caused some of the coating to be removed. Upon review by the client, the tested products did not meet the cleaning needs. During the third trial Chem Tech Westech CT-4712 was the only product to remove the coating from the front of the lens. Kyzen Ionox FCR, Inland Tech EP 921 and Dynamold Solvents DS 104 all effected the coating on the back.