PR-1428 Class B is a low adhesion sealant.

工作溫度范圍從-65°F（-54℃）至250°F（121℃），間歇性游覽高達275°F（135℃下）。材料是專為使用的檢修門密封膠或制造點膠墊圈(工廠檢驗計劃)。它也可以被用來防止燃料，濕氣，灰塵和短路保護電線，終端及設備，

PR-1428 B類是由兩部分組成，二氧化錳固化，聚硫化合物。未固化的材料是一種低弧垂，觸變性膏狀適合配用擠壓槍或抹刀。對常用飛機基材有著良好的附著力，在室溫下固化形成有彈性的密封膠。

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.

PR-1428 Class B is a two-part, manganese dioxide cured, polysulfide compound. 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.