Weather Sealant

Silicone Weatherproofing Sealant is a one-part, neutral- cure, architectural grade sealant. It easily extrudes in anyweather and cures at ambient temperaturebyreaction with moisture in the air to form a durable, flexible silicone rubber seal.

SiliconeWeatherproofing Sealant is a specified, premium performance weather sealing product specifically designed for general glazing and weather sealing in curtainwall and building facades

Ideal for expansion, connection, perimeter and other movement joints
Neutral cure – suitable for use on coated glass, galvanized steel, masonry andother porous and non-porous substrates
Extension/compression movement capability of up to ±50 percent of the original joint width.
Excellent weatherability, virtually unaffected by sunlight, rain, snow, ozone.
Excellent unprimed adhesion to a wide variety of construction materials and buildingcomponents
Ease of application – ready to use as supplied
Excellent rheology, low string upon gunning

Test	Property	Unit	Result
Uncured – As Tested at 50% RH and 23°C (73°F)
ASTM C639	Flow (sag or slump)	inches (mm)	0
ASTM C603	Extrusion Rate	g/minute	140
	Working Time	minutes	20
ASTM C679	Tack-free Time, 77°F, 50% RH	minutes	40
	Curing Time at 77°F (25°C) and 50% RH	days	7–14
	VOC Content	g/L	31
As Cured – After 21 days at 50% RH and 77°F (25°C)
ASTM D2240	Durometer Hardness, Shore A	points	34
ASTM C794	Peel Strength	lb/in (kg/cm)	30 (5.4)
ASTM C719	Joint Movement Capability	percent	±50
ASTM C1135	Tensile Adhesion Strength At 25% extension	Psi (MPa)	40 (0.276)
	At 50% extension	Psi (MPa)	60 (0.414)

Clean all joints removing all foreign matter and contaminants such as grease, oil, dust, water, frost, surface dirt, old sealants or glazing compounds and protective coatings.

Install backing material orjoint filler, setting blocks, spacer shims and tapes.
Mask areasadjacent to joints to ensure neat sealant lines.
Primer is generally not required onnon- porous surfaces, but maybe necessary for optimal sealant of certain porous surfaces.Atest placement is always recommended.
Apply Silicone Weather proofing Sealant in a continuous operation using a positive pressure. (Thesealant can beappliedusing many types of air-operated guns and most types of bulk dispensing equipment.
Before a skin forms (typically within 15 minutes), tool the sealant with light pressure to spread the sealant against backing material and the joint surfaces.
Remove maskingtapeas soon as the bead is tooled.