ALDOSEAL 399 is a high solid, low VOC, one-part silicone elastomeric flashing grade specifically designed for use in sealing roof penetrations, curbs, seams, flashing areas and any other roof top areas of possible water infiltration. ALDOSEAL 399 is also the sealant of choice for any roof system that has been previously coated with a silicone elastomeric coating. Once applied, this silicone flashing grade provides a durable, seamless and flexible system that resists lateral movement, shear and will allow for normal expansion and contraction. Mil for mil, ALDOSEAL 399 provides greater waterproofing protection than similar flashing grade silicone sealants and offers excellent resistance to moisture penetration.
ALDOSEAL 399 was specifically developed as a protective sealant for pipe boots, seams, flashing areas, curbs, exposed fasteners and all other breaches in a roof system that will allow water to enter a structure. With excellent adhesion to other silicone products, ALDOSEAL 399 is proven to provide long term durability versus water based sealants.
TYPICAL PHYSICAL PROPERTIES
TOTAL SOLIDS: 95% ± 3 by volume
WEIGHT PER GALLON: 10.7 lbs per gallon
FLASH POINT: >200° F
CLEAN UP SOLVENT: ALDOTHINNER II
SHELF LIFE: 12 months @ 50°- 85° F
VISCOSITY: 150,000 cps
HARDNESS: 50 ± 5 Shore A
TENSILE STRENGTH: 130
PERMEABILITY: 4.2 perms
SERVICE TEMPERATURE: -25o TO 175o F
THINNER: Not Recommended
CURE TIMES: 12-18 Hours
TACK FREE: 1-2 Hour
PACKAGE SIZE: 2 gallon pails
VOC: <50 grams per liter
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