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SEALANT: This is a material designed to maintain
a bond between the sides of a joint, which may be subjected to different
degrees of movement, and prevent the passage of air, water, dust,
etc. between the mediums.
JOINT: Solution for continuity between two rigid materials that are
subjected to movement, which has different parts:
Free face: the accessible surface of the medium where the joint is
located.
Joint edges: the side walls of the joint that outline the location
of the sealing material.
Joint base: material that limits the depth of the sealant in the
joint and services three purposes: sizing the joint, increasing the
adhesion of the sealant between the mediums and preventing adhesion
of the sealant to a third face, which would cause breakage inside
the joint.
Joint depth: distance between the free face or surface and the base
of the joint.
DILATION: effect that occurs in the joint that consists of an increase
of its width.
CONTRACTION: effect that occurs in the joint that consists of a decrease
of its width.
PRIMER: product used to treat one or both of the surfaces to be sealed
in order to improve or achieve proper adhesion between them. Both
surfaces must be dry before sealing.
APPLICATION TEMPERATURE: the temperature of the surfaces to be sealed
when the sealant is applied.
SERVICE TEMPERATURE: the temperature extremes between which the sealant,
once applied, maintains its properties intact.
SKIN FORMATION: time after which the sealant is no longer sticky.
MOVEMENT CAPACITY: the percentage of movement that a joint can withstand
during contraction or dilation; it is given in a +/- percentage of
the width of the joint, and it indicates the maximum movement in
one direction or the other that it is capable of withstanding. Joints
subjected to movements must be sealed with materials with permanent
elasticity only. |
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