Ardex ABA 291Y

One Component Non Sag Polyurethane Sealant  

    
Product Description 

ABA 291Y is a single component, low modulus non sagging elastomeric polyurethane sealant ideally
for expansion and construction joint applications. After application, the sealant cures with atmospheric moisture to form a durable rubber seal.  
Feature & Benefits 

• Good durability
• Remain flexible throughout
• Excellent workability – easy, quick to apply, no mixing
• Decorative – choice of colour
• Non staining
• Paintable with most acrylic paints 
• Conform to ASTM C920 sealant standard 

Application Range 

• Metal frame perimeter sealing
• Various joint sealing of PC or RC
• Granite, marble and sandstone joints
• Aluminium windows  

Specification Clause 
All joints indicated shall be sealed with ABA 291Y, a single component non sagging polyurethane
sealant supplied by Ardex Singapore Pte Ltd, or similar approved. 

Application Notes 
Packaging  
Available in 600ml aluminum foil sausage, 20 sausages per box
Colour 
Available in white, grey, sand beige, black and brown.
 
Shelf Life 
12 months when stored at below 25oC. Avoid exposure to humidity or temperature above 50oC for long time.  
 
Coverage 
For 10mm x 10mm joint size, 600ml of ABA 291Y will cover approximately 6 metre. 
 
Substrate Preparation 
Surfaces must be structurally sound, fully cured, dry, clean and free of dirt, moisture, loose particles, oil and grease, asphalt, tar, paint, wax, rust, waterproofing, curing compounds and membrane materials.  

Joint Preparation 
Clean joint saw cut and control joints of dust, the joint width should be designed for a maximum of
±50% movement. The depth of the sealant should be 1/2 the width of the joint. The maximum depth is 13mm and the minimum is 6mm. In deep joints, the sealant depth must be controlled by closed cell backer rod or joint filler. Where the joint depth does not permit the use of backer rod, a bond-breaker (polyethylene strip) must be used to prevent three-point bonding. Soft backer rod should be pproximately 25% larger in diameter that the joint width.   

Priming 
In most situations, priming is not necessary. However, for non-porous surfaces prime with ABA Primer No. 1. One thin coat should be applied using a clean, dry brush ensuring complete coverage. 
Application  
ABA 291Y must be applied between 30 minutes to 3 hours after priming depending upon the climatic
conditions. If the primed surface cured more than 3 hours, the surfaces need to be re-primed before
applying the sealant. ABA 291Y should be applied by means of a caulking gun. Extrude the sealant
firmly into the joint to ensure complete contact with joint surfaces. Tool off the sealant by using a
tooling stick. Remove masking tape immediately after tooling.   
Cleaning 
Clean equipment immediately after use with solvent. Use proper precaution when handling solvent.
Remove cured sealant by cutting with a sharp edge tool. 
Product Limitation 

• Do not use it for glazing works
• Do not use soapy water for tooling
• Do not applied sealant for immersion, such as swimming pools, spas etc.  

Safety Data 
ABA 291Y contains isocyanates. The use of protective gloves during application is recommended. In
case of contact of the material with the eyes, rinse with plenty of water and consult a physician. Hands and tools must be cleaned before curing with solvent. 
 
User Notes 
The technical details and recommendations contained in this data sheet are given in good faith and
represent the best of our knowledge and experience at the time of printing. It is the responsibility of
the user to ensure that the products are used in accordance with the ABA’s instructions and in
applications for which they are intended.
 
Technical Data