覆盖隔热垫的主要原因是将其固定在适当的位置，并防止灰尘和液体（尤其是水）等污染物进入。 由于其轻量和良好的抗撕裂性，广泛使用了非常薄的聚酯薄膜或用尼龙纱线增强的聚氟乙烯塑料薄膜（0.5至2密耳）。 在容易遭受滥用的区域，使用了轻质，耐磨的涂层织物，例如乙烯基涂层的尼龙和乙烯基涂层的玻璃纤维。 高温区域需要使用有机硅涂层的玻璃纤维，金属化的玻璃纤维或陶瓷材料保护层。
C.3.2 Insulation Covers
The main reasons for covering insulation batting are to hold it in place and to keep out contaminants such as dust and fluids, especially water. Very thin plastic films (0.5 to 2 mils) of polyester or polyvinyl fluoride reinforced with nylon yarn are used extensively due to their light weight and good tear resistance. In areas that are subject to abuse, lightweight, abrasion-resistant coated fabrics such as vinyl-coated nylon and vinyl-coated fiberglass are used. Areas subject to higher temperature require the use of silicone-coated fiberglass, metallized fiberglass, or ceramic covers.