permeability cups

• Permeability Cups (ถ้วยทดสอบการซึมผ่านของไอน้ำ)

  Permeability Cups (ถ้วยทดสอบการซึมผ่านของไอน้ำ) The permeability of a coating to water vapor is measured by suspending a free film of the material across the top of a wide shallow ...

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