White, single-component, high solids, moisture cure silicone roof coating.

Excellent weather and water resistance, cured film resists degrading, chalking under harsh UV exposure.

ASTM D6694

Solar Reflectance: 0.87 Initial (White Only) 0.70 3-Yr. Aged

Thermal Emittance: 0.89 Initial (White Only) 0.90 3-Yr. Aged

SRI: 110 Initial (White Only) 86 3-Yr. Aged

Miami-Dade approved

Newly sprayed polyurethane foam, previously silicone coated roofs, bare galvanized metal, concrete roofs (no primer required); painted metal (requires 180 Karna-Sil Ultra Epoxy Primer); TPO, PVC, Hypalon, EPDM roofs, smooth built-up asphalt (BUR), smooth and granule modified bitumen membrane (requires 406 Tru-Grip Base Coat, 405 Bond-N-Shield Base Coat or 180 Karna-Sil Ultra Epoxy Primer). New BUR surfaces must be allow to age a minimum of 90 -180 days. SBS and APP granular modified membranes and smooth surface APP membranes must be allowed to weathered a minimum of 30 days as well as new metal roofs. 670HS may be used on vertical as well as horizontal applications. All surfaces must have positive drainage.

Note: Vertical application may require multiple coats to achieve desired film thickness.

Meets ASTM D6694

Weight per Gallon: 10.7 lbs.

Viscosity: 25,000 cps ASTM D2196 Method A

Solids by Weight: 94%, Nominal

Solids by Volume: 91%, Nominal

Color: White

Hardness, Shore A: 50

Elongation: 212% @ 73° Nominal 167% @ 0°F Nominal ASTM D2370

Tensile Strength: 227 PSI @ 73° Nominal 317 PSI @ 0° Nominal ASTM D2370

Tear Resistance: 26 PSI ASTM D624

Cure Time: 2 hrs. @ 95°F / 90% RH 8 hrs. @ 50°F / 20% RH

Shelf Life (Unopened): 12 months (Stored at 35°F – 75°F)

Application Temp.: 50°F to 120°F

Service Temp(Cured Film): -75°F to 180°F

VOC Content: <50 g/L MAX

SURFACE PREPARATIONS:
‍Surfaces to be coated should be dry, clean, and free of dirt, dust, grease, oil and loose rust or coating. Recommended application temperature is 50°F to 120°F. Power wash surfaces with 799 Wash-N-Prep Roof Cleaner or 507 SPC Primer/Wash (EPDM Only) and water. Wash roof surfaces with a minimum of 2000 psi. taking all necessary precautions to avoid damage to the roof system. Patch and repair all seams, flashings, damaged areas, leak and cracks with 502MS Karna-Flex, 505MS Karna-Flex WB, 671 Karna-Seal or appropriate sealants or caulking materials.

APPLICATION:
‍670HS Karna-Sil Ultra should be applied in a single coat application at the required application rate. If additional coats are to be applied, allow previous coat to cure 2-8 hours (dependent upon temperature and humidity) before applying subsequent coat. Subsequent coats should be applied within 24 hours of previous application to ensure uniform adhesion. Applied coating film should be even and free of pinholes. Coverage will vary depending on the surface to be coated. To improve aesthetics, impact resistance and toughness of the coating, ceramic roofing granules should be applied immediately into the final coat after application. Back-roll granules into coating and allow to cure then blow off or sweep loose granules from the surface. Mix coating prior to application with a 3” diameter mixer (5-gallon pail) or 6” diameter mixer (50 gallon drum). Once product is mixed, the entire container should be used. 670HS Karna-Sil Ultra may be applied by brush, roller or airless spray equipment. Apply at temperatures 50°F to 120°F. Do not apply if rain is expected within 24 hours after application. Commencement of work by the contractor implies their approval of the roof surface. See listing at www.nsf.org for application and cure instructions for rainwater catchment use.

ROLLER / BRUSH APPLICATION:
‍Apply with a 3/4" – 1-1/4” nap roller or soft roof brush.

SPRAY APPLICATION:
For spray application, a high-pressure airless spray unit with a minimum of 5500 psi working pressure at the gun tip should be used. The pump must have a 3 gallon per
minute output. Hoses should be jacketed for prevention of moisture contamination. Hoses should have a 3/4” ID and tip size should be a minimum size 0.041 orifice. Do not use with hoses that have been used to spray acrylic coatings.

COVERAGE RATE:
‍Apply in a single coat at 1.5 gallons per 100 sq. ft. (24 wet mils) for most applications. May be applied up to 3 gallons per 100 sq. ft. on approved horizontal substrates in one application, where applicable.

COLORS:
White. For other available colors contact KARNAK Customer or Technical Service.

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Follow SDS and all recommended safety procedures strictly when using these products. If spraying, equipment should be grounded to avoid accidental ignition due to static sparks. Avoid breathing solvent vapors. Use with appropriate MESA/NIOSH approved respirator when exposure can exceed recommended PEL. Not for interior use. Do not apply when rain is imminent. Keep containers properly sealed when stored indoors, in a cool well-ventilated area. Keep containers away from moisture. Keep away from heat, sparks and open flame. Do not store above 100°F. Do not thin. Keep out of reach of children. Avoid prolonged contact with skin. Dispose of in an environmentally safe manner. Cover air intakes during application and while drying. For exterior use only.

Per NRCA (National Roofing Contractors Association), “The criteria for judging proper slope for drainage is that there be no evidence of standing water on a deck 48 hours after it stops raining.”