Specialty Products Group; Knowledge Page for Construction Professionals and Stake Holders for the use of Vapor Lock™

Certification: Please read and click on the appropriate link at the bottom of the page.

Vapor Lock™ is an ASTM C-494 type S certified Concrete Ad-Mix. It is certified to be free of all Chlorides and chlorines.

This paper was prepared specifically to share information about Vapor Lock™ to all construction professionals who interact with Vapor Lock™ enhanced concrete. This includes but is not limited to:

From this list it is obvious that many trades interact with Vapor Lock™ enhanced concrete.

What is Vapor Lock™?

Vapor Lock™ is actually a family of products that have similar chemical characteristics, so the information here is applicable to all Vapor Lock™ Concrete Ad-mixes. The family currently includes:

Please contact The Specialty Products Group, SPG, at 877-957-4626 or info@SpgGoGreen.com for help with choosing the correct product for you application.

All Vapor Lock™ Ad-Mixes focus on quality. Quality of the concrete and quality of the materials. The American Concrete Institute, ACI, states: “The key to long lasting, durable concrete, is impermeability.” Vapor Lock™ accomplishes this impermeability by changing concrete’s weakest point into its strongest. Here is how this is accomplished: Concrete that does not contain Vapor Lock™ (Unenhanced)has about twice as much water as the chemical process (Hydration) requires and makes about 600 lbs. of Calcium Silicate Hydrate (C-S-H) and a substantial amount of a waste byproduct Calcium Hydroxide (CH). This “Free Water” or water of convenience allows the aggerate in the concrete to settle. This settling creates Bleed Channels as the lightest component of the concrete, water, fills in the tract created by the settling aggerate. This is one of the paths that creates porosity in the concrete, not only does bleed water come out of the concrete while it is in its plastic state through this route, but this path allows future ingress of water, salt, Carbon Dioxide and chemicals. The CO₂ that follows this path eventually destroys the concrete’s natural defense against corrosion. This is called passivity.

Vapor Lock™ does not take any of concrete’s good characteristics away, it simply combines the “freewater” with the CH. In a process similar to Flyash and GGBFS, although much faster and more predictable. This chemical process converts up to 145 lbs. of freewater and 145 lbs. of CH into about 300 lbs. of extra Crème’ (C-S-H.) Combined the C-S-H content in Vapor Lock™ Enhanced Concrete is about 50% higher than unenhanced concrete.

 Vapor Lock™ helps all trades with ease of installation and prevents the aggerate from settling. This extra Crème’ not only stops the creation of bleed channels but drastically reduces the size of concrete’s internal pores and creates tortuosity. Tortuosity is resistance to moisture vapor moving through the non-continuous pore and capillaries. The result is Vapor Lock™ enhanced concrete is virtually impermeable.

Batch Plants and Concrete Precasters

Vapor Lock™ should be added to the headwater to ensure proper mixing.  While it is compatible with most other Concrete Ad-mixes, all mixes should be dispensed through a separate outlet. Vapor Lock™ should not directly contact the Portland Cement until the water is added. Redi-mix facilities that are working on a project that requires  SPG presence on the jobsite, please give at least 5 days notice so that attendance at the placement can be arranged. One 4” cylinder per day of Vapor Lock™ placed concrete is requested. The SPG Technical Sales Representative will help to co-ordinate this process. As a Quality Control step, SPG includes a priority marker in the Vapor Lock™. This marker can be used to verify the approximate dosing rate. Warrantied projects require a SPG review of a project specific mix design, to verify compatibility with insurance requirements. In general, Vapor Lock™ is dosed at 10 ounces per hundredweight (650 ml/ 100 Kg) of cementious materials. There is also a minimum dosing rate of 52 ounces per cubic yard. (1.8L/Mᵌ) If the Vapor Lock™ must be tail loaded, please ensure through mixing with at least 5 minutes at mix speed. Please contact SPG with any questions.

Normally there is a modest strength gain within the first 28 days. Much larger gains have been realized in the breaks at 56 days and beyond.

Most Redi-Mix suppliers value their relationship with SPG since profits are boosted with this value added, easy to use material.


Finishing Vapor Lock™ concrete is commonly viewed as preferable to finishing unenhanced concrete. Since there is extra Crème’ there is virtually no bleed water. Please do not wait for the bleed water to start finishing. Please follow ACI best practices for Hot or Cold Weather placements. If you see a significant amount of bleed water, please contact SPG or your local Technical Sales respective immediately. Please confirm that the Redi-mix, the General Contractor, or the finisher has been in touch with SPG regarding the starting of a new warrantied project.


Vapor Lock™ helps with reducing pump pressures. Pumping professionals actually view Vapor Lock™ as a pumping aid, especially when using Lightweight Concrete.

General Contractors

Please confirm that SPG’s local Technical Sales rep or SPG, is aware of the upcoming project, so that testing, sampling and documenting efforts can be properly coordinated.

Flooring, Roofing and Coating

Vapor Lock™ has been used in millions and millions of square feet of projects. Different applications require SPG to do different testing. Please contact SPG or your Local Technical Sales Representative to determine the test protocols for your particular project. Projects are generally sped up with roofing, flooring, or coating being able to be applied much sooner. Your Technical Sales Representative will work with the SPG Technical Dept. to determine the timeline for your project based on your conditions. Generally, the concrete should be viewed as an impermeable substrate however because of close scrutiny to the mix design, Vapor Lock™ enhanced concrete will healthily allow surface Carbonation. This allows the PH on the surface to be reduced to an acceptable point for flooring adhesives, while helping to maintain passivity where it is needed. This carbonation also encourages mechanical adhesion of coating, primers and glues.  Moisture and bond testing must be conducted prior to installation, upon successful completion an authorization to proceed will be issued in writing.

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