Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Product Type
- Technologies
- Product Families
Features & Benefits
- Ready-to-Use Product Features
- Benefits
- Virtually unaffected by temperature fluctuations, high humidity or moisture containing substrates
- Effective with vinyl ester, polyester, FRP, steel, concrete and other substrates
- Improves bonding up to 24 hours after application
Applications & Uses
- Applications
- Compatible Substrates & Surfaces
- Application Guidelines
- Prepare the thermoplastic surface to be bonded by lightly sanding, then cleaning with styrene monomer. Chemically degraded sections should be ground down to structurally sound laminate.
- Steel should be sandblasted to white metal and primed promptly to avoid the formation of flash rust. Non-copper blast media must be used to avoid inhibition of Primer 71 curing. Smooth, troweled concrete surfaces should also be sandblasted.
- Primer 71 components must be mixed before use. Blend 1 part (by weight) Part A with 4 parts (by weight) Part B. The pot life of blended Primer 71is approximately 60 – 90 minutes at 80°F and 50% relative humidity.
- Blome Primer 71 may be used on vertical surfaces or to improve adhesion to very porous substrates. Blend 3% hydrophilic fumed silica (Cabosil TS-720) into Primer 71 Part B (up to 1 part by volume), followed by 0.2% Tween 20 or Tween 80 (Croda).
- One gallon of blended material covers approximately 250 square feet on steel substrates, and approximately 150 square feet on concrete or brick substrates.
- Apply the Primer 71 mixture using brush, roller or spray for larger surfaces. Allow primer to cure for a minimum of 2 hours at ambient temperatures. Complete curing is evident when the primer surface cannot be indented by a fingernail. The cure is moisture-initiated, so cure time will vary with temperature and humidity conditions. If primer is left for more than 24 hours, reapplication will be necessary to obtain full interlaminar bond strength.
- Apply appropriate resin over the cured, primed surface, and then complete application according to accepted industry practice.
- To ensure maximum performance of the Primer 71 Bonding System, conduct small scale tests to determine the most suitable conditions. Specific substrates should also be evaluated before large scale operations are conducted.
- Protect components from exposure to moisture; reseal opened containers and keep them tightly sealed after use.
Properties
- Component A
- Component B
- Typical Properties
| Value | Units | Test Method / Conditions | |
| Flash Point | 425.0 | °F | — |
| Specific Gravity (77°F) | 1.23 | — | — |
| Viscosity (77°F) | 180.0 | cps | — |
| Vapor Pressure (77°F) | max. 1x10⁻⁴ | mm Hg | — |
| Isocyanate Equivalent Weight (77°F) | 133.0 | — | — |
| NCO Content (77°F) | 31.5 | % | — |
| Acidity (HCl, 77°F) | 0.02 | % | — |
| Value | Units | Test Method / Conditions | |
| Flash Point | 81.0 | °F | — |
| Specific Gravity (77°F) | 1.02 | — | — |
| Viscosity (77°F) | 180.0 | cps | — |
| Value | Units | Test Method / Conditions | |
| VOC | max. 20 | g/L | — |
Safety & Health
- Caution
Mix and use with extreme caution. Blome Primer 71 may cause skin irritation with prolonged or repeated contact. Avoid skin contact and follow the material safety data sheet, which is available for each product.
Storage & Handling
- Shelf Life
- 6 Months