ST 3990 is self-leveling type and ST 3991 is non-sagging type, both are one-component neutral curing, specially designed for airport runways, highways, tunnel, bridges and other concrete or asphalt pavements for long-lasting weather sealing and waterproofing of upward, downward and longitudinal seams, with low modulus, high displacement, and good expansion and contraction restoration characteristics, with a displacement capacity of up to +100/-50 grades to adapt to the roadway joints. Displacement capacity up to +100/-50 levels, adaptable to pavement joints.
Artificially accelerated climate aging test shows that its excellent weatherability is fully capable of high and low temperatures, strong ultraviolet environment of the concrete road surface of the harsh test.
Conformity Standards
ST3990/ST3991 meets or exceeds the following standards:
Industry Standard ST3990: SR I N 50LM JC/T 976-2005 / ST3991: SR I S 50LM JC/T 976-2005 American Standard ASTM C 920-05 + 100, -50 levels, ASTM D 5893-04
Packaging and Color
(1) ST3990/ST3991 can be packed in 20 liter plastic drums with a net content of 25kg;
(2) ST3991 can be packed in composite plastic film, net content of 800g;
(3) The color is gray or other colors as required by users.
Storage and Validity
Store in a cool and dry place below 27℃, the storage period is 9 months from the date of production.
Technical Service
(1) Provide complete technical data of the product.
(2) Adhesion test:
ST3990/ST3991 Silicone Joint Sealant has excellent adhesion to concrete without primer
treatment. However, due to the diversity of concrete configurations and different surface
cleanliness; we can not guarantee that the sealant is suitable for all road concrete, must be carried out before the large-scale use of small-scale bonding test on the site, in order to make a reasonable program to ensure good adhesion.
The Use of Precautions
(1) Not suitable for construction in bad weather;
(2） It should not be used on frosty or wet surfaces;
(3) Not suitable for use on all materials that will exude grease, plasticizers or solvents, such as the surface of oil-impregnated wood;
(4) Not suitable for use in places continuously immersed in water and oil;
(5) Not suitable for use in airtight places, because the sealant needs to absorb the trace moisture in the air curing;
(6) When the surface temperature of the material is lower than 4℃ or more than 40℃, it is not suitable for construction.
(7) The newly poured concrete should be maintained in dry weather for at least 7 days, in case of rainy days, each rainy day must correspond to an additional drying day, i.e., to ensure at least 7 days of drying and maintenance; for quick completion or fast drying type of concrete, please contact our technical service personnel;
(8) When installing the sealant, it should be lower than the road surface to prevent abrasion;
(9) Restrictions on the use of substrates: not suitable for copper, lead, galvanized metal surfaces and polycarbonate materials.
Safety Instructions
(1) The product is completely cured and non-toxic, but should be avoided before the curing and eye contact, if contact with the eyes, please use a lot of water to flush, and find a doctor to deal with; uncured products should be avoided contact with children.
(2) For technical information about the safety of the product, please contact our customer service center.
