Type M: High compressive and tensile bond strength
Type S: Moderate compressive and tensile bond strength
Type N: Low compressive and tensile bond strength
Type O: Very low compressive and tensile bond strength
Type K: No longer used
Type S mortar is a good all-purpose mortar.
Now lets look at how mortar is specified using each cementitious system. Specification is either by proportion or by property. Specification by proportion is the default. If the specifier does not say by property, the specification is assumed to be by proportion.
