WC-1 NG is a specially formulated water-based breathing-type mastic coating for the protection of thermal insulation, or other substrates, in nuclear applications where it is important to minimize the risk of stress corrosion occurring on certain types of steel components. WC-1 NG contains only minimal levels of chlorides, fluorides, oxidizable sulfur, and other leachable contaminants which can cause stress corrosion. WC-1 NG is a heavy-bodied high-build coating which provides excellent topcoat protection while maintaining a very low flame spread classification.
WC-1 NG is a PVA based material which can be applied by trowel, palm or spray to a wet film thickness of 1/8” to yield our recommended dried film thickness of 1/16” (application method must be specified when ordering). Whey dry, WC-1 NG provides a tough, durable, flexible film which offers excellent protection from the elements, other sources of moisture, mechanical abuse and a variety of moderately harsh chemical environments. It will maintain a water-tight seal under intermittent flooding but should not be used where it will be exposed to continual standing water.
WC-1 NG has been fully tested by independent government-approved laboratories for compliance with NRC Reg. Guide 1.36 and MIL-DTL-24244D (SH).
WC-1 NG is a latex emulsion which contains no hazardous substances or solvents. It must be protected from freezing during storage and application. It must be protected from moisture, freezing, oil, grease and foot traffic, until it is thoroughly cured.
Vimasco manufactures under a stringent quality assurance program in accordance with MIL-I-45208 and each batch is tested for compliance with the appropriate standard or specification. Our manufacturing and Quality Assurance procedures are routinely audited by government and private industry inspectors.
We do not include the SDS for these products on our website, these may be obtained by contacting our office at our regular address, phone, fax or e-mail.
Product Information Data
SPECIFICATION COMPLIANCE
MIL-DTL-24244D(SH)
NRC Reg. Guide 1.36
SERVICE TEMPERATURE RANGE
0ºF to 180ºF constant (-17.8ºC to 82.2ºC)
-20ºF to 200ºF intermittent (-29ºC to 93ºC)
COLOR
White (other colors available but require separate qualification testing)
PERM RATING (ASTM F 1249 WVTR)
1.97
COVERAGE (ASTM C 461)
13sq. ft./gal. @ 1/8” wet (.32 m²/liter @ 3.17mm)
FIRE HAZARD CLASSIFICATION (ASTM E 84)
Flame Spread 15
Also meets fire test requirement of MIL-C-19565C
DRYING TIME (ASTM D 1640-69)
To touch: 2 hours to 8 hours; Through: 12 to 48 hours (Depending upon temperature, relative humidity and substrate)
CLEANUP
Wet State: water Dry State: safety solvent
WEIGHT PER U.S. GALLON (ASTM D 1475)
10.2 pounds (1.22 kg/liter)
RECOMMENDED SHELF LIFE
18 months in unopened container @ 40ºF (4ºC) to 90ºF (32ºC)
SOLIDS
64% by weight 54% ± 2% by volume
CAUTION
The addition of water or any thinning agent to this product will change its physical properties and will adversely affect its performance. No expressed or implied warranty will be offered on applications where this product has been thinned or altered in any manner.