| 摘要 |
A gasket ( 10 ) is provided for an evacuation head assembly ( 20 ) to evacuate a chamber ( 104 ) defined by two glass sheets ( 101, 102 ). The gasket ( 10 ) may be made from a metal foil such as aluminium and has opposite sealing surfaces ( 14, 15, 19 ) that are profiled with a series of fine grooves ( 17 ) and wherein the variation in thickness between the sealing surfaces is less than 1 mum.
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