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Reversible Optical Cement

IP.com Disclosure Number: IPCOM000098031D
Original Publication Date: 1961-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Schmeckenbecher, AF: AUTHOR

Abstract

In order to cut and machine glass or ceramic parts it is desirable that they be held fast together by a cement which is reversible. That is, the cement is easy to dissolve and remove after the parts are cut.

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Reversible Optical Cement

In order to cut and machine glass or ceramic parts it is desirable that they be held fast together by a cement which is reversible. That is, the cement is easy to dissolve and remove after the parts are cut.

Such a reversible cement compound is prepared by mixing equal parts by weight of magnesium oxide and magnesium chloride with water to form a paste to hold glass parts. After standing for several hours at room temperature, the paste turns into a very hard brittle mass without evolution or absorption of an excessive amount of heat. The hardened material and embedded parts are now readily machined. In weak aqueous acids (pH 2-4) it is dissolved at room temperature in a few days, or at an elevated temperature in a few hours. This compound is very useful in machining small objects consisting of hard or brittle material such as glass, by embedding or potting the parts in the paste before it hardens, machine the hardened material together with the parts in a desired way, and then dissolve the potting material in a weak acid to recover the clean machined parts. Compound 1: 10g magnesium chloride (MgCL(2)- 6H(2)O) 10g magnesium oxide (Mg O)

and 5 m 1 water

Dissolution is hastened by adding a water soluble pulverulent material as a filler, such as a finely powdered sodium chloride, to the paste before it hardens. Compound 2: To the paste prepared as for compound 1, 10-20g of finely powdered sodium chloride is added.

The hardness and machinabil...