定义垫片类型和使用的材料选择如下一个值：
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Rubber
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PTFE
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Expanded PTFE
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Expanded graphite without metal insertion
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Expanded graphite with perforated metal insertion
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Expanded graphite with adhesive flat metal insertion
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Expanded Graphit and metallic sheets laminated in thin layers withstanding high stresses
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Non-asbestos fibre with binder, eG < 1mm
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Non-asbestors fibre with binder, eG >= 1mm