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CRISTOBALITE (Silicon Dioxide) (560 words) |
 | Cristobalite is common in volcanic rocks and many microscopic crystals are easily seen in a petrographic microscope. |
| Most cristobalite is believed to crystallize as beta cristobalite which has an isometric symmetry and later as the crystal cools, it easily converts to alpha cristobalite or just cristobalite. |
| The conversion from beta cristobalite to cristobalite is so easy that the beta cristobalite's isometric crystals are outwardly preserved in their original form. |
| United States Patent Application: 0030109624 (3721 words) |
| The composition of claim 5 wherein said cristobalite silica is a powder with mean particle size of from 1 to 3 micrometers and maximum particle size of 25 micrometers and wherein the amount of said cristobalite silica is 9% to 16% by weight based on the weight of said composition. |
| Cristobalite silica is preferably added during a time when the reaction mixture has low enough viscosity to be stirred, so that the cristobalite silica can be mixed with the other components. |
| Cristobalite silica may be added to the RP prepolymer in the same manners and amounts as in the one- and two-stage processes. |
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