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.
Mastinox is not affected by most hydrocarbons or greases.
It is recommended however, that wherever Mastinox will come in contact with aggressive hydraulic fluids, for example "Skydrol" it is protected using a conventional polyurethane paint system.
Direct contact between different alloys can lead to galvanic corrosion at the joint.
In assemblies which are subject to shock and vibration, this corrosion is exacerbated by the presence of humidity. Jointing compounds are therefore required which both inhibit corrosion and at the same time, are effective insulators.
Their remarkable flexibility minimizes any risk of cracking or separation resulting from ageing.