PR-1750 B類飛機整體燃料密封膠。溫度范圍從-65°F（-54℃）至250°F（121℃），間歇性偏移高達360°F（182℃）。這種材料是專為圓角密封油箱和其他飛機機身密封應用。長期接觸航空噴氣燃料和天然氣后，固化的密封劑仍保持彈性。PR-1750 B類是由兩部分組成，二氧化錳固化的聚硫化合物。未固化的材料是一種低弧垂，觸變性膏狀適合配合擠壓槍或抹刀使用。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。

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.