PR-1428 Class B is a low adhesion sealant.

工作温度范围从-65°F（-54℃）至250°F（121℃），间歇性游览高达275°F（135℃下）。材料是专为使用的检修门密封胶或制造点胶垫圈(工厂检验计划)。它也可以被用来防止燃料，湿气，灰尘和短路保护电线，终端及设备，

PR-1428 B类是由两部分组成，二氧化锰固化，聚硫化合物。未固化的材料是一种低弧垂，触变性膏状适合配用挤压枪或抹刀。对常用飞机基材有着良好的附着力，在室温下固化形成有弹性的密封胶。

 Features

It has a service temperature range from -65°F (-54°C) to 250°F (121°C), with intermittent excursions up to 275°F (135°C).

The material is designed for use as an access door sealant or in the fabrication of form-in-place (FIP) gaskets. It can also be used to protect electrical wires, terminals and equipment against fuel, moisture, dirt and short circuits.

The uncured material is a low sag, thixotropic paste suitable for application by extrusion gun or spatula.

It cures at room temperature to form a removable seal to common aircraft substrates.