ISO 7991:1987
Glass — Determination of coefficient of mean linear thermal expansion
Glass — Determination of coefficient of mean linear thermal expansion
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 7
- Дата публикации:
- 26 ноября 1987 г.
- Издание:
- ISO IS 7991 edition 1 version 1
- ICS:
- 81.040.01
The method deals with the measurement of the change of length of a glass fibre under specified conditions. The apparatus including the used dilatometers and the possibilities of corretion, the formulae for the final length and the expansion coefficient are specified. In the annex, devices for self-adjusting alignment of specimen and push-rod axis are described and illustrated.
Abstract
Overview
ISO 7991:1987 specifies a standardized laboratory method for determining the of glass in its elastic, solid-like state (well below the transformation temperature). The nominal reference temperature is , so expansion results are reported as . The method describes specimen preparation, dilatometer apparatus, furnace and temperature-measurement requirements, correction procedures and calculation formulae. An annex illustrates self-adjusting alignment devices for specimen and push‑rod axes.
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