ASTM C Standard Specification for Latex Sealants. ASTM C This standard covers latex sealants used for sealing joints in building construction. The following are tests done within this standard: extrudability. Meets ASTM-C 40 Year Durability. Product Description: Paintable. SIITex 40 Siliconized Acrylic Latex Caulk is a white caulking. Mildew Resistant compound.

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Link to Active This link will always route to the current Active version of the standard.

They receive different ratings based on their ability to move, flex and return to their original configuration. Applying sealants c34 gaps and joints in construction projects takes more than a strong wrist and a steady hand. Is it an inside or outside application?

New silicone may not stick to old silicone, so proper surface preparation is the key to successful sealant repairs where silicones have been used. Typically, the higher the cost, the greater the performance you can expect. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. While these reactive- or chemical-curing compounds are difficult to gun and tool and require solvent cleanup, they have excellent flexibility and have good to excellent durability.

They tend to be more expensive than other types of sealants.

Product Specifications

Sealants used in commercial construction may be specified by the owner, architect or engineer; however, the contractor often has final say on brand and type.

ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. Like any family, each has strong points, weak points and idiosyncrasies that can make it a very good — or very poor — match for the job at hand. Answering these questions before you begin will help you select the best sealant for the job: All purpose sealant with average flexibility and adhesion Sealant selection is very much performance-based.


How much joint movement is required? These are the most common in the paint industry and come in a variety of formulations that affect cost, durability and adhesion. Unauthorized reproduction of any information on this site is a violation of existing copyright laws. They shrink little while curing and can withstand traffic once cured. They maintain their properties over a wide temperature range. The sealant shall be composed of latex formulated with appropriate fillers, pigments, and chemical additives.

Historical Version s – view previous versions of standard. Adtm a sealant requires an understanding of the joint: Successful gap-filling starts with selecting the right sealant for the job and continues with proper surface preparation and application. Silicones are also reactive-curing compounds, but they offer easy gunning ability. The inch-pound in parenthesis are provided for information purposes only.

All acrylics are paintable, and no primer is needed before application. Currently, there is no ISO standard similar to this specification. It is essential, therefore, that the type and grade be specified for proper description of a sealant.

Once cured, they are very flexible, extremely durable and resist ultraviolet light degradation. Sealants are tested to federal specifications or standards set by ASTM. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. The following are the type and grade of sealant under this specification: Because they are hard to remove completely, especially on porous surfaces, repairs and future painting can be difficult.

Urethane hybrid blended acrylics are at the high end of the acrylic family in cost and performance and can often be used in a variety of applications where a silicone or polyurethane sealant may be used. They are easy to gun and because they are water-based, they clean up easily.


Is this an above — or below-ground application? What is the substrate? Choices must be made after considering the amount of expansion and contraction the joint will experience at the extreme temperature ranges of the area.

Other articles in this issue: This abstract is a brief summary of the referenced standard. It should be recognized by the user that not all sealants meeting this specification are suitable for all applications and all substrates. Their jelly-like consistency makes them hard to tool for a nice finish, but they cure quickly and will cure at below-freezing temperatures.

ASTM C – 05 Standard Specification for Latex Sealants

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Some must be applied to a primed surface, but in general they adhere well to a variety of surfaces.

Norman Efros Manufacturer Profile: Does the sealant need to be paintable or must it match the substrate? Sealants, Caulks, Caulking Guns Selecting a sealant requires an understanding of the joint: Select the proper sealant Painters can err by selecting the wrong type of sealant or expecting too much from it.

The following tests shall be done: If tests are required using substrates in addition to or other than standard, they should be so specified for testing. What is the ambient and surface temperature at the time of application?