PR-1750 B类飞机整体燃料密封胶。温度范围从-65°F（-54℃）至250°F（121℃），间歇性偏移高达360°F（182℃）。这种材料是专为圆角密封油箱和其他飞机机身密封应用。长期接触航空喷气燃料和天然气后，固化的密封剂仍保持弹性。PR-1750 B类是由两部分组成，二氧化锰固化的聚硫化合物。未固化的材料是一种低弧垂，触变性膏状适合配合挤压枪或抹刀使用。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。

PR-1750 Class B is an aircraft integral fuel tank sealant. It has a service temperature range from -65°F (-54°C) to 250°F (121°C), with intermittent excursions up to 360°F (182°C). This material is designed for fillet sealing of fuel tanks and other aircraft fuselage sealing applications. The cured sealant maintains excellent elastomeric properties after prolonged exposure to both jet fuel and aviation gas. PR-1750 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 resilient sealant having excellent adhesion to common aircraft substrates.