PPG PRC-DeSoto D40 Mastinox Yellow BMS 3-27A Spec Jointing Compound is used in separable assemblies to connect parts and seal seams. The jointing compound is suitable for use in high-temperature applications where the environmental temperature is high or where engine temperature is known to reach up to 200 degrees Celsius. Mastinox is not affected by most hydrocarbons or greases, making it ideal for use in engine assemblies. If the compound will come in contact with aggressive hydraulic fluids, it is recommended that a coat of conventional polyurethane paint is applied for extra protection.
The choice of the correct grade of Mastinox can be based on two criteria.
- Whether the joint is likely to be separated at any time or whether it will remain permanently assembled.
- Temperature resistance required.
a. Permanent assemblies: choose a version of Mastinox which cures in contact with air
Mastinox C627B is very flexible and contains corrosion inhibiting pigments. It has very good resistance to aging and to temperatures between 100-120°C.
b. Separable assemblies:
choose a non-hardening version
Mastinox 6856H (1914/3600) - resists temperatures up to 115-120°C. Mastinox 6856K (1913/3600) ? use in preference to Mastinox 6856H where temperatures are likely to exceed 150-160°C Mastinox D40 (1640/3600) ? use where temperatures are likely to reach 200°C.
Alternate PN#s: FMI1080
Boeing PN/Spec#: BMS 3-27A