Dow Corning Molykote 111 Aerospace Grade Valve Lubricant and Sealant, DC-111, 5.3oz for O-Ring, Valve, and Fitting Applications
Valves, O-rings, and fittings in fuel, hydraulic, and pneumatic systems need a lubricant that seals as well as it lubricates, stays in place through water exposure and temperature variation, and does not degrade the rubber and plastic components it contacts. Supplied by JHEARs Aerospace, Dow Corning Molykote 111 is the aerospace-grade silicone compound that handles the lubrication and sealing function in a single application. Water washout resistance keeps the protective film on seals and fittings through washdowns and moisture exposure, and the wide operating temperature stability means the compound performs consistently whether the aircraft has been sitting overnight in a cold hangar or working through a sustained hot operation cycle.
Compatibility with most rubber and plastic materials makes Molykote 111 a reliable default for valve, O-ring, and fitting lubrication where the specific elastomer type may not always be immediately known, reducing the risk of seal degradation from an incompatible lubricant. The 5.3oz container provides a practical working quantity for bench and line maintenance use without the waste of a larger industrial-format container when precision, low-volume application is the normal requirement for seal and valve servicing work.
Spec: Dow Corning Molykote 111 silicone valve lubricant and sealant, aerospace grade, DC-111. 5.3oz container. Silicone base, wide temperature range stability, water washout resistant. Compatible with most rubber and plastic elastomers. Suitable for O-rings, valves, fittings, and seals in fuel, hydraulic, and pneumatic system applications.
Who this is for: Aircraft mechanics and MRO engineers servicing valves, O-ring seals, and fittings across fuel, hydraulic, and pneumatic systems, maintenance technicians who need a rubber-compatible silicone lubricant and sealant in a single compound, and engineers working on any system where valve and seal lubrication and moisture sealing are both required at the same service point.
FAQ
Is Molykote 111 safe to use on all rubber O-ring materials including Viton and nitrile?
Molykote 111 is compatible with most common elastomers including nitrile (NBR), neoprene, EPDM, and silicone rubber. Compatibility with Viton (FKM) fluoroelastomers is generally good, but as with any lubricant applied to critical sealing components, verify compatibility with your specific elastomer specification and aircraft maintenance documentation before application in fuel or hydraulic system service.
Can Molykote 111 be used as both a lubricant and a sealant in valve assemblies?
Yes. Molykote 111 functions as both a lubricant and a sealant in valve and fitting applications, providing smooth operation of valve seats and O-ring seals while also forming a sealing film that resists moisture ingress and fluid weepage at fitting interfaces. It is this dual function that makes it a widely specified compound across aerospace valve and fitting maintenance.
What is the temperature range over which Molykote 111 remains effective?
Molykote 111 is stable and effective across a wide temperature range suited to aerospace applications, from low-temperature cold-soak conditions through to sustained high-temperature operating environments. Refer to the Molykote 111 technical data sheet for specific temperature performance data relevant to your application.
Why should I purchase my specialist valve lubricants from JHEARs Aerospace?
At JHEARs Aerospace, we supply aerospace-grade lubricants and sealants sourced for professional use in aviation system maintenance. Our range is selected to ensure product authenticity and specification compliance for the valve, seal, and fitting applications that your maintenance programme depends on.
