民航北京维修基地担负着大、中型客机的维修任务。从1965年开始试修苏制伊尔18飞机时,采用由苏联进口的密封材料 y-30M。以后采用国内研制成功的聚硫型密封剂 XM 15和XM 16,分别作为结构油箱和气密舱的密封。随着民航事业的发展,先后从国外引进了大型客机三叉戟、伊尔62、波音707和波音747飞机。初期,外场维护这些飞机所用的密封剂均从国外进口,但密封剂贮存期短而运输周期又长,难以满足航线维修的需要,尤其是三叉戟飞机的结构油箱经常出现渗漏,问题不小。因此,立足国内,解决各型客机用的密封剂已成为当 Civil Aviation Beijing maintenance base is responsible for the maintenance tasks of large and medium-sized passenger aircraft. From 1965 trial trial Su Yi Il 18 aircraft, the seal material imported by the Soviet Union y-30M. After the successful use of domestic research and development of polysulfide sealants XM 15 and XM 16, respectively, as the structure of the tank and airtight seal. With the development of civil aviation, large passenger planes such as Trident, Il 62, Boeing 707 and Boeing 747 have been introduced from abroad. Initially, the sealants used for outfield maintenance of these aircraft were imported from abroad, but the sealant storage period is short and the transport period is long, which is difficult to meet the needs of route maintenance. In particular, the structure of Trident aircraft often leaks into the fuel tank, and the problem is not small . Therefore, based on the domestic, to solve various types of passenger aircraft sealant has become