670 Karna-Sil Ultra
Karnak 670HS Karna-Sil Ultra is a white, single component, high solids, moisture curing silicone coating that produces a durable elastic coating with exceptional weathering and water resistance characteristics.
670HS Karna-Sil Ultra is ready to use right from the container as a protective
coating directly over spray polyurethane foam. 670HS Karna-Sil Ultra may also be
applied directly over silicone coated SPF roof as soon as the surface is
power-washed clean and dry without the use of 180 Karna-Sil Epoxy Primer. Over
Metal, built-up asphalt (BUR), modified bitumen membrane, concrete, masonry,
TPO, PVC, Hypalon and EPDM surfaces you must prime first with 180 Karna-Sil
Epoxy Primer before applying coating. Coating may be used on vertical as well as
horizontal applications. All surfaces must have positive drainage.
Surfaces to be coated should be dry, clean, and free of dirt, dust, grease, oil and
loose rust or coating. 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 Karna-Flex WB, Karna-Flex, 550 Patch-N-Go self sealing tape or
appropriate sealants or caulking materials.
Karnak 670HS Karna-Sil Ultra can be applied in a single coat application
(Material warranty only), or a multi-coat application (Required for Labor &
Material Warranties). Allow first coat to cure 2-8 hours before applying second
coat (dependant upon temperature and humidity). Subsequent coats should be
applied within 24 hours of prior applications to insure 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 top coat after application. Back-roll granules in, allow coating to cure then
blow off or vacuum loose granules.
Mix coating prior to application with a 3” diameter mixer (5-gallon pail) or
6” diameter mixer (55 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 and rising. Do not apply if rain is
expected within 24 hours after application. Commencement of work by the contractor implies his approval of the roof surface.
For spray application, a high-pressure airless spray unit with a minimum of 3500 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 ¾” ID and tip size should be a minimum size 0.030 orifice.
Do not use with hoses that have been used to spray acrylic coatings.
Single Coat: Apply at 1.5 gallon per 100 square feet (25 dry mils)
Multi-Coat: Apply each coat at 1.5 gallon per 100 square feet (25 dry mils x
number of coats)
CARE OF TOOLS:
While material is still wet, tools and spray equipment may be cleaned with mineral spirits or VM&P
Naptha. Do not leave coating in spray guns, pump equipment and hoses for prolonged periods. Take
necessary precautions when handling flammable materials.
Weight per Gallon:
Solids by Weight:
96% ASTM D-1644
Solids by Volume:
96 % ASTM D-22697
0.87 ASTM C-1549
0.70 ASTM C-1549
0.89 ASTM C-1371
0.90 ASTM C-1371
Hardness Shore A:
50 ASTM D-2240
||192% at 73°F ASTM D-2370
216% at 0°F ASTM D-2370
||331 PSI at 73°F ASTM D-2370
432 PSI at 0°F ASTM D-2370
||40°F and rising
||50°F-90°F. Dry environment
||5.9perms ASTM E-96
||-15°F to 180°F
(Temp.& Humidity Dependent)
|Shelf Life (Unopened):
(Stored at 35°F- 85°F)
||< 50 g/L
Cool Roof Rating Council (CRRC)
1. Solar Reflectance: Initial 0.87 3 year 0.70
2. Thermal Emittance: Initial 0.89 3 year 0.90
3. SRI: Initial 110 3 year 86
Pumping 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. Please refer to MSDS for more safety information.
COLD-PROCESS SYSTEMS AND COATING,EITHER EMULSION OR SOLVENT BASED,SHOULD
ONLY BE INSTALLED ON DECKS WITH POSITIVE DRAINAGE.
PER NRCA, (NATIONAL ROOFING CONTRACTORS ASSOCIATION), “THE CRITERIA FOR
JUDGING PROPER SLOPE FOR DRAINAGE IS THAT THERE BE NO EVIDENCE OF STANDING
WATER ON THE DECK 48 HOURS AFTER IT STOPS RAINING.”
Available in 5 gallon pails and 55 gallon drums.
If further information is needed, contactKarnak Technical Services at 1-800-526-4236.