Product Announcement from KOSTER American Corporation
SB BONDING EMULSION
ADDITIVE FOR KOSTER NB 1 SYSTEM AND OTHER CEMENT BASED COMPOUNDS
KOSTER SB BONDING EMULSION is a carboxylated styrene butadiene copolymer latex. It is designed to be used as an additive for KOESTER NB 1 as well as with hydraulic cements. It imparts excellent improved protection from water soluble salts, acid and alkalis.
The addition of KOSTER SB BONDING EMULSION to hydraulic cement mixes results in:
-> Improved adhesion to most substrates
-> Improved water resistance
-> Improved resistance to dilute alkalis
-> Improved resistance to dilute acids
-> Improved resistance to water soluble salts
-> Increased flexural strength
-> Improved abrasion resistance
-> Improved free-thaw resistance
-> Reduced water cement ratios
-> Improved flexibility which enables thermal movements and surface tensions to be more easily accommodated, reducing the risk of cracking.
-> KOSTER SB BONDING EMULSION can, however, slightly reduce compressive strength.
As a plasticizer for KOSTER NB 1 SYSTEM.
As an additive to Cement Mortar, to improve adhesion to the substrates and water resistance of the final product.
For bonding slurries as well as floor and wall toppings, etc.
To improve Freeze-Thaw Resistance of cement-based mixes.
For cant strips between walls and floors.
For overlays, underlayments and screeds.
Surface must be sound, clean and free of contaminants like curling compounds, dust, dirt, paint, oil, previous coatings and form-release agents. Substrates must have cured a minimum of 7 days and provide an absorptive surface.
A damp surface is required prior to applications of mixes containing KOSTER SB BONDING EMULSION.
As additive to KOSTER NB 1, positive side application, mix 1 part SB BONDING EMULSION with 7 parts clean potable water (see CSI specifications) (1:13 SB/water for negative side applications).
As additive to mortar, concrete or bonding slurry, premix SB BONDING EMULSION with water 1:1.
Suggested mixes for cement and sand are:
*Mortars: 1:3 cement/sand
Bonding Slurry 1:1 cement/sand
Concrete: Depends on individual mix design
*Depending on thickness of application.
Consult manufacturer of details.
When mixing KOSTER SB BONDING EMULSION with cement/sand, use slow-speed mixing equipment to avoid aeration of mix. Always add cement/sand mix to SB BONDING EMULSION/water mix. Use clean potable water only.
Suggested trowel application techniques of mixes containing KOSTER SB BONDING EMULSION:
1. Use the minimum possible trowel strokes to finish mixes containing SB BONDING EMULSION.
2. Do not try to refinish already-troweled surface.
3. Apply minimum pressure when troweling and finishing mixes.
Clean all mixing and application equipment with water immediately after use.
KOSTER SB BONDING EMULSION modified mixes do not require curing if used as mortars. The latex forms a skin that acts as a curing compound.
If KOSTER SB BONDING AGENT is used as an additive for overlays or screed mixes, a wet cure using wet burlap bags and plastic sheeting is recommended. Place burlap and plastic as soon as cement has reached initial set. Wet cure for a minimum of 48 hours.
NO CURING IS PERMITTED AND NECESSARY WHEN KOESTER SB BONDING EMULSION IS USED AS ADDITIVE TO KOSTER NB 1 SYSTEM.
5 gallon containers
55 gallon drums
KOSTER SB BONDING EMULSION has a shelf-life of 1 year.
Long-term exposure to temperatures in excess of 95°F must be avoided.
PROTECT FROM FREEZING.
As all butadiene copolymers, this latex is sensitive to copper and manganese ions. Exposure to these should be avoided.