Hardening of the surfaces of blanket and felt insulation improves the resistance to erosion by high-velocity gases and reduces the permeability of gases.
羊毛和毡绝缘表面的硬化增强了产品对高速气体侵蚀性的抵抗能力，同时也降低了渗气性。
Hardening of the surfaces of blanket and felt insulation improves the resistance to erosion by high-velocity gases and reduces the permeability of gases.
羊毛和毡绝缘表面的硬化增强了产品对高速气体侵蚀性的抵抗能力，同时也降低了渗气性。
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