PR-1776 C級(jí)是一個(gè)低密度，高溫度飛機(jī)整體燃料密封。工作溫度范圍從-65°F（-54℃）至250°F（121℃），間歇性偏移高達(dá)360°F（182℃）。

PR-1776 Class C is a low density, high temperature 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).

這種材料是專為圓角密封油箱和其他飛機(jī)機(jī)身密封應(yīng)用。盡可能多節(jié)約20％重量，每單位體積，超過(guò)傳統(tǒng)密封較

長(zhǎng)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。

會(huì)抵制有限接觸二磷酸托架液壓液。

PR-1776M C類是由兩部分組成，二氧化錳固化PERMAPOL?P-5改性聚硫。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。

室溫下固化，形成有彈性的密封劑，對(duì)常見(jiàn)的飛機(jī)基板具有優(yōu)異的粘附性。

This material is designed for brush sealing of fuel tanks and other aircraft fuselage sealing applications. It offers as much as a twenty percent weight savings, per unit volume, over traditional sealants used for these purposes.The cured sealant maintains excellent elastomeric properties after prolonged exposure to aircraft fuels, (both jet fuel and aviation gas) and will resist limited contact to diphosphate ester based hydraulic fluids.

PR-1776 Class C is a two-part, manganese dioxide cured Permapol? P-5 modified polysulfide. The uncured material is a roller grade liquid suitable for application by brush, extrusion gun or spatula. It cures at room temperature to form a resilient sealant having excellent adhesion to common aircraft substrates.