LIGO Document E050228-v2
- Hydroxide-catalysis bonding is the process by which a hydroxide, Na in our application, catalyzes the silica surface by hydration and dehydration.
This document describes the procedure to join two pieces of glass using this bonding technique referred to as “silicate bondingâ€.
Because the surfaces are required to be in close contact to bond, a flatness of λ/10 is required on the surfaces to maximize bond strength.
The surfaces must be free of particles, thus, the bonding must take place under a Class 100 laminar flow bench.
Operator must be dressed in clean room attire.
Frock, boots, head cover, facemask, and approved cleanroom gloves are required.
- 09/16/05: The first version of this document was written by Helena Armandula and reviewed by Caroline Cantley in 2005.
08/31/10: The document was updated due to advances in the hydroxide preparation procedure. Also, the recommended hydroxide ratio has changed. Strength measurements have shown that a 1:6 volumetric ratio of the commercially available sodium silicate solution to DI water gives stronger bonds on average than 1:4 solutions do (Elliffe et al. Class. Quant. Grav., 2005 and recent results Karen Haughian).
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