Window & Door Sealant

ASI 335 Window & Door Sealant is a high performance, one-part, neutral cure silicone that reacts with moisture at ambient temperatures to form an attractive, color-stable, durable, highly flexible rubber seal with excellent movement capabilities (+50%, -50%). ASI 335 Window Seal has excellent adhesion to nonporous surfaces such as glass, metals and plastics, as well as porous surfaces, vinyl, concrete and mortar.  ASI 335 Window & Door Sealant greatly outperforms solvent based chemistries and products loaded with fillers. ASI Window & Door Sealant is also AAMA approved.


ASI 335 Window & Door Sealant meets or exceeds the requirements of federal specifications TT-S-00230c (COM-NBS) Type II, Class A for one component elastometric building sealants, TT-S_001543a (COM-NBS), for silicone building sealants.  ASI window caulk is AAMA approved.

General Uses

ASI 335 Window & Door Sealant is primarily intended for use in perimeter sealing of window and door frames, butt glazing, 2-sided structural glazing, dual seal insulated glass units, in expansion and construction joints in masonry or metal building panels and sealing curtain wall joints where the medium modulus flexibility is beneficial. Pre-application testing to determine feasibility of use in a given application is recommended prior to actual use.

Surface Preparation

Provided that all bonding surfaces are clean and dry, ASI 335 Window & Door Sealant has excellent unprimed adhesion to most substrates. If there is any doubt about contamination, surfaces should be solvent wiped with oil-free solvents, such as xylol, toluol, naphtha or nonflammable chlorinated solvents. Do not solvent wipe with oil-based solvents such as Varsol.


Priming for ASI 335 Window Sealant is normally not required for application to most substrates. Unprimed adhesion can be readily testing by applying a small trial bead and allowing 7 days for maximum adhesion to occur.

ASI 335 Windows Sealant has excellent unprimed adhesion to many substrates as shown in the adhesion chart.


ASI 335 Window Sealant should not be applied to surfaces that will be painted. Painting over sealant is not recommended because paint film does not stretch with the extension of the sealant and the adhesion of paint to the sealant is not adequate.

Safety Precautions

ASI 335 Window Sealant, when stored in original unopened container at or below 32ºC(90ºF), has a shelf life of 12 months from date of shipment.

Warranty and Limitations

ASI warrants that its products will meet its specifications. ASI shall in no event be liable for incidental or consequential damages. Except as expressly stipulated, ASI’s liability, expressed or implied, is limited to the stated selling price of any detective goods.


About American Sealants, Inc.

Since 1987 American Sealants has become a recognized and trusted manufacturer, supplier and packager for some of the biggest brand name adhesive and industrial companies in the United States. American Sealants Inc. has grown due to its manufacturing capabilities, core values, and quality control processes. As a leader in the industry, our experienced customer service and technical team are here to ensure your satisfaction. You can be assured that you are receiving a quality product. We do not cut corners to provide cost savings – rather we offer a high performing product at a competitive price through our capabilities and processes. If you do not see something listed on our website, please do not hesitate to call and ask. With our experience we can help you get moving in the right direction.