Ultra low expansion glass has an coefficient of thermal expansion of about 10 " 8 / K at 5 35 �C . It has a thermal conductivity of 1.31 w / ( m " �C ), thermal diffusion of 0.0079 cm 2 / s, a mean specific heat of 767 J / ( kg " �C ), a strain point of 890 �C [ 1634 �F ], and an estimated softening point of 1490 �C [ 2714 �F ], an annealing point of 1000 �C [ 1832 �F ].
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