Material Selction Flashcards
1
Q
Latex
A
- Interior use only
- Limited flexibility (movement) - typically <10%
- Not suitable for joint treatment
- Paintable with latex products only
- Limited service life before replacement is required
- Commonly referred to as a caulk not a sealant
2
Q
Acrylics
A
- Interior & exterior use
- Limited flexibility (movement) - typically <12.5%
- Slightly more flexible than latex
- Poor weathering characteristics
- Can be painted with most common paint products
- Limited service life before replacement is required
- Commonly referred to as a caulk not a sealant
3
Q
Butyls
A
- Interior & exterior use
- Good bond to many substrates
- Limited flexibility (movement) - typically <10%
- Poor weathering characteristics
- Can be used as a sealant and an adhesive
- Can be difficult to apply (sticky and “stringy”)
4
Q
Polysulfide’s
A
- Interior & exterior use
- Good bond to many substrates
- Limited flexibility (movement) - typically <12.5%
- Poor recovery to its original state after extension/elongation
- Good chemical resistance properties
- Good for submerged applications
- Commonly require a primer
- Typically high solvent content (VOCs)
5
Q
Silicones
A
- Interior & exterior use
- Good bond characteristics to many substrates
- Good UV stability
- Good flexibility (movement) - typically <350%
- Very sensitive to application conditions; adhesion is easily adversely affected
- Difficult for other materials to bond to
- Poor stain resistance
- Prone to dirt pick up
- Poor paintability characteristics with water based paints
6
Q
Polyurethanes
A
- Interior & exterior use
- Wide range of modulus performances available (low to high)
- Typically high solvent content (VOCs)
- High isocyanates content (carcinogens)
- Good flexibility (movement) - typically up to 1,000%
- Poor adhesion on damp substrates
- Bubbling common in high humidity conditions or when applied to damp surfaces
- Reduced performance in low temperature conditions
- Stiffer and more difficult to apply
- Reduced bond strength
- Reduced service life compared to STPs
7
Q
Silane Terminated Polyethers (STP) (a.k.a. MS Hybrids)
A
- Interior & exterior use
- Combine the best of polyurethane and silicone technologies
- 100% solids, isocyanate FREE (NO VOCs!), Environmentally friendly
- Good flexibility (movement) - typically up to 1,000%
- Maintains flexibility both in-service and during application in lower temperatures
- Easy to install, even in low temperatures
- Fast tack free and full cure times
- Exceptional bond
- Bonds to silicates within the concrete and maximizes bond strength
- Bonds to damp substrates
8
Q
Sell CTS Sealants….
A
- Will NOT bubble in humid conditions or when applied to damp substrates
- Maximizes service life
- Paintable in 24 hours with most common paint & coating materials
- Good dirt pick up resistance
- High heat resistance
- Great weather and UV resistance
- Good stain resistance
- Very high peel and tensile strengths
- Good adhesion to a wide variety of substrates (e.g., wood, metals, plastics, ceramics)