We have been updating the average coefficient of linear expansion [α], transition point [Tg], and yield point [At] values using new equipment since last year, and we are pleased to announce that all the average coefficient of linear expansion [α], transition point [Tg], and yield point [At] values on our website have been changed with the 2025 catalog update.

From the temperature and elongation of the glass sample, the mean linear coefficient of thermal expansion is determined and shown up to the first integer in units of 10-7K-1 for 3 temperature ranges; –30℃ to 70℃, 100℃ to 300℃, and -100℃ to 300℃ for each 10℃ increment.

In accordance with the change, we have decided to remove the “*” mark, which identifies the renewal device. We appreciate your kind attention to this change.