泡沫敷料可具有不可透水的背衬层，该背衬层一直在敷料顶部上延伸并向下延伸到伤口接触表面。
The foam dressing may have a water-impervious backing layer, which extends all the way over the top of the dressing and down to the wound-contacting surface.
关键制模工艺包括：母模制备、金属型壳制造、模框制作、背衬强化层制作、脱模以及后处理等。
Arc spray tooling process mainly includes: master pattern preparation, surface pretreatment, fabrication of the metal shell, frame fabrication.
产品是背衬绝热功能材料，由其性能决定，不能用作炉衬的工作层。
The calcium silicate boards is back-up insulation material in all refractory constructions. Due to its capability, it can not be used as work layer of stove.
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