所使用的绝热/隔音材料大多数是纤维玻璃棉，密度为0.42至0.6 lb/ft3，并与经过疏水处理的酚醛粘合剂粘合在一起。 玻璃纤维的直径非常小，出于声学原因，大约为0.0006英寸。 该材料很容易满足FAR 25.853（a）和FAR 25.855（a）的要求。 在其他绝热应用中（例如，用于风管），泡沫（例如，尿烷和聚酰亚胺）和毡（例如，芳香族聚酰胺）被广泛使用。 在较高温度的区域，使用带有硅树脂粘合剂的纤维状玻璃棉（最高温度为700°F）和陶瓷纤维（最高温度为2,000°F）。 应用领域包括发动机吊架，机舱，动力装置和发动机引气管。
C.3.1 Batting
Most of the thermal/acoustical insulation used is fibrous glass batting that is 0.42 to 0.6 lb/ft3 in density and held together with a water-repellent treated phenolic binder. The diameter of the glass fiber is very small, approximately 0.0006 inch for acoustical reasons. The material easily meets FAR 25.853(a) and FAR 25.855(a). In other insulation applications (e.g., used for air ducting), foams (e.g., urethane and polyimide) and felts (e.g., aromatic polyamides) are extensively used. In higher temperature areas, fibrous glass batting with a silicone binder (for temperatures up to 700°F) and ceramic batting (for temperatures up to 2,000°F) are used. Areas of application include engine pylons, nacelles, power units, and engine bleed air ducting.