Features: Imparts water repellency to a wide variety of substrates

Description: Nano Siloxane-100-2770 WB is a nonflammable, water-soluble sodium methyl siloxane solution designed to impart water repellency to a wide variety of surfaces. Supplied at a concentration of 30% solids in water, its usually diluted to a concentration of 3% before being applied. The final concentration depends on the application. The siloxane reacts with moisture and carbon dioxide in the air to form an insoluble water-resistant resin within 24 hours.

Benefits: Reduces water absorption into substrates, reducing spalling due to freeze-thaw and efflorescence. Colorless and non-yellowing protection preserves the natural appearance of substrate. Penetrating and breathable, low VOC, and Nonflammable.

Composition: Water-dilatable sodium Nano Methyl Siloxane solutions clear to light yellow.

Applications: Hydrophobing treatment of plasterboard and plaster blocks. Treatment for powders and granular materials to make them water repellent and free flowing, and to reduce caking.


Typical Properties: Specification Writers: These values are not intended for use in preparing specifications. Please contact your local sales representative prior to writing specifications on this product.

Test Unit Value
Solids Contents, After 90 Min
At 150 degree C (150°F) % 30
Silicone Solids Content % 19
Specific Gravity at 25 Degree C (77°F) 1.25
Flash Point, Open Cup Degree C (F) 0 (212)
pH 13 >10
Density lb/gal (g/L) 10.4 (1240)
Solvent (thinner) Water
VOC Content lb/gal (g/L) 0.668 (80)

How to Use: Nano Siloxane-100-2770-WB is primarily used as a material additive or surface treatment in applications that utilize its ability to impart a water repellent surface and reduce water absorption.

As a Surface Treatment: Nano Siloxane-100-2770-WB is diluted to a concentration of 3% solids or less just prior to application. To prepare a 3% solution, mix one gallon (3.78 liters) of Nano Siloxane-100-2770-WB as supplied with 11 gallons (4.16 liters) of water.

Do not use concentration higher than 3% solids unless prior testing indicates a necessity. The use of higher concentrations that requited may result in the formulation of a white residue on the surface. Users should test any concentration on substrate prior to use. After application of the solution, the treated surface should be allowed to dry at least 24 hours to develop maximum water repellency.

This interval may be shortened somewhat by force drying at temperatures up to 149 degree C. (300 degree F). While this removes the water quickly, time must be allowed for the curing reaction between Nano Siloxane-100-2770-WB and the surface being treated, CO2 streams do not appear to reduce the cure time appreciably.

Substrate %Active
Total Solids
Rate ft2/gal (m2/I)
%Water Exclusion
vs. Control after 72 hrs
%Water Absorption
Limestone 3
50(1.2) 2.1 2.3
Glen Gary
Salem Brick
200(4.9) 75.4


Belden Alamo
Jumbo Brick
130(3.2) 74.4 1.2
Belcrest 350
110(2.7) 65.2 1.50

Application methods: Dilute solutions of Nano Siloxane-100-2770-WB as recommended. Apply by spraying, or brushing.

Surfaces to receive water-soluble siloxane should be lightly dampened immediately prior to application. Water-soluble siloxane does not wet a surface that has been previously treated with a water repellent.

When spraying Nano Siloxane-100-2770-WB, great care should be taken to protect nearby vegetation or articles from over spray. The material is very caustic. It will damage or kill vegetation and will stain or etch glass, plastic, aluminum and most metals. If contamination does occur, wash immediately with water. Due to the high solvent resistance of the cured material, water repellant that has been dried on glass must be scraped, and other surfaces may require sandblasting. If a white precipitate of Na2CO3 should form due to the use of too concentrated a solution of water repellent, rundown, overlapping, or second coating, sand blasting or wire brushing may be necessary to remove it if water does not.

Product Safety Information: See MSDS


Usable life/Storage: When stored at or below 25 degree C in the original unopened containers, this product has a usable life of 36 months from the date of production.


Limitations: This product is neither tested nor represented as suitable for medical or Pharmaceutical uses.


Limited Warranty: The information contained herein is offered in good faith and is believed to be accurate. However, because conditions and methods of use or our products are beyond our control, this information should not be used in substitution for consumer’s tests to ensure that our products are safe, effective, and fully satisfactory for the intended end use. Suggestions of use shall not be taken as inducements to infringe any patent. Your exclusive remedy for breach of such warranty is limited to refund of purchase price or replacement of any product shown to be other than as warranted.