If die-cast sewer pipe joints are used, they shall be similar and
equal to the Slipseal Sewer Joint as made with dies and materials
furnished by the Universal Sewer Pipe Corporation, Cleveland, Ohio,
Die Cast Sewer Joint as made by American Vitrified Products Company,
Cleveland, Ohio, Atlas Slipjoint Compound as made by the Atlas Mineral
Products Company, Mertztown, Pennsylvania, or approved equal. Sewer
pipe shall be primed and cast with Slipseal or equal approved die-cast
tapered-type joint, which shall be made by fitting the spigot and
socket of the pipe with collars of Slipseal bituminous compound. Compound
shall have a melting point of 240° - 270° F., and a penetration
of 4-7 at 77° F. A lining or ring of this jointing material shall
be die-cast into the socket of the pipe. The spigot shall be fitted
with a collar of the same material, die-cast around the end of the
pipe, and of a size such that when shoved firmly into the socket portion
of the pipe, a tight fit between the socket and the spigot end of
the pipe will be made. All pipe must be dry and clean when lining
and collar cast, and a compound must be poured at a heat high enough
to procure proper adhesion to the pipe. When laying these pipes, the
lining and collar shall be painted with Slipseal solvent, which shall
cause their surfaces to become plastic or tacky, and when the pipes
are shoved firmly together, the joint material shall unite, and incidental
to the diffusion of the solvent, congeal and become one homogeneous
body. The foregoing is a brief description of the method of making
this type of joint, however, during construction the manufacturer's
directions shall be followed in all respects.