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�V����ʯӢ������ �����@�N�B��⋵ļ���������Ԫ��ʯӢ�°������Ч����ֹUv-B��Uv-C���⾀��ȫ��ݗ���Լ�Uv-A���⾀�Ĵ󲿷�ݗ�䣬��һ�N�����׺�ȫ��Uv������****��Ҋ͸��ȵ�������ϣ����m����ʯӢ�u��?z��)������w��늟�������Uv��Դ���Ķ�������Ч�ط�ֹ�����ܵ����⾀ݗ����ɵČ�(du��)���w�Լ����w��Σ�������ÿ��ԾS�ֿ�Ҋ���_(d��)��****�Ă���Ч�ʡ� �������w�ijߴ繫����g(sh��)ָ��(bi��o)��Ҋ��I����II����III����IV�� �ߴ繫�Dimensional Tolerance (table I)

�⏽���� Range of 0D �⏽ 0D �ں� WT ƫ�ڶ� Siding �E�A�� Out of Round ������ Bow/1220mm ��6mm ��20�� ��10�� 12�� 2.0�� 2.5mm 6.0-15.00m ��1.25�� ��8�� 10�� 1.5�� 2.5mm 15.00-20.00mm ��1.25�� ��10�� 15�� 1.5�� 2.5mm 20.00-25.00mm ��1.25�� ��10�� 15�� 1.5�� 3.0mm 25.00-30.00mm ��1.35�� ��12�� 15�� 1.5�� 3.0mm 29.00-38.00mm ��1.35�� ��12�� 15�� 1.5�� 3.0mm

��λ/���W(xu��)�ɷּ��u��������Chemical composition&OH (table II)

�tCr �NGe �FFe �VMg �Ti �}Ca �XAl �cNa �Li �K �u��OH 20 0.4 1.5 0.4 100 1.0 16 2.3 0.5 2.0 ��25

�������� ��Physical Properties (table III)

�ܶ� Density 20����kg��m-3(��103) 2.2 ����Ûϵ��(sh��) Coefficient of expansion 25-300�� c-1(��10-6) 0.56 ܛ���c(di��n) Softening point(��) 1630 �˻��c(di��n) Annealning point(��) 1180 ׃���c(di��n) Strain point(��) 1100 ����ģ�� Youngs modulus(pa) 7.3��105

����1.0mm��̎��͸�_(d��)�� ��Spectral Transmission at 1.0mm Thickness (table IV)

nm ��220 230-280 290-330 350 450 550 590 780 �� 0 ��15 0 15 88 92 93 93