ASTM C279 :- Standard Specification for Chemical-Resistant Masonry Units

 This specification covers solid, kiln fired brick and tile
made from clay, shale, or mixtures thereof, suitable for indoor
and outdoor use in masonry construction subjected to chemical
environments 

The brick and tile covered herein are intended for use in
chemical environments where resistance to thermal shock may
be a consideration. 

The brick and tile are normally used with
chemical-resistant mortars.  The values stated in inch-pound units are to be regarded
as standard.

Classification

The physical and chemical properties of brick and tile
differ from supplier to supplier, mainly because their composition is determined by the source of raw materials. Regardless
of the differences, brick and tile are considered to be one of
three types and one of two classes as follows:

Type I—For use where low absorption and high acid
resistance are not major factors.

Type II—For use where lower absorption and higher
acid resistance are required

Type III—For use where minimum absorption and
maximum acid resistance are required.

Class S—For use in standard applications.

Class X—For use where a higher degree of precision
and lower permissible variation in size than that permitted for
Class S is required.

Physical Properties

Strength—The brick and tile when tested in accordance
with Test Methods C67 shall conform to the requirements for
modulus of rupture (flexural strength) for the type specified, as
prescribed in Table 1. 

5.2 Water Absorption—The brick and tile when tested in
accordance with Test Methods C20 shall conform to the
requirements for water absorption (based on the 2 h boil) for
the type specified, as prescribed in Table 1.

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