Unit 5 A&O - Sealants Flashcards
These sealants are typically used for non-exposed metal-to-metal joints and zone dam seals.
Butyl sealants
Less prevalent across the Ironworking tade than silicones, these sealants are still commonly used to seal window wall, curtain wall, and storefront perimeters.
Polyurethane sealants
These sealants are odorless and non-toxic, with good chemical and oil resistance.
Polyurethane sealants
The basic __________ polymer is clear and colorless and therefore lends itself to an unlimited range of color tints.
silicone
The outstanding property of silicone sealants is their high recovery from _________.
compression
Name the three types of silicone
Neutral cure, base cure, and acid cure.
This polymer is extremely versaltile and can be compounded for a wide variety of uses.
Polyurethane
Sealant tapes are most commonly made from ______ or _______.
Butyl, foam
The four crucial aspects of sealant applications are ___________, three sided adhesion, percentage of movement capability, and structural use.
depth to width ratio
For proper stretching characteristics, the ______ of a joint should be ________ the width of the joint.
depth, one-half
You can use either of these (2) materials to prevent three-sided adhesion.
Backer rod and bond-breaker tape
Joints can be classified as either _______ or ___________.
Working or non-working
It is extremely important to check the type of _______ material before applying any sealant.
substrate
When using backer rod, the diameter should _______ than the joint.
greater
This kind of backer rod is easy to install but does not repel water or provide good insulation.
Open cell
This kind of backer rod repels water and provides a firm backing to the joint, but must be installed with care not to puncture.
Closed cell
The ironwoker should consult the _______________ before any sealant is applied.
sealant application drawings
