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Construction Silicone:  

High joint movement accommodation, one-component silicone joint sealant for facade applications  

 

Uses:  

For sealing moving or static joints in:  

Precast or in-situ concrete  

Curtain walls and lightweight cladding  

Tilt-up slabs  

Brick, blockwork, marble and granite facades  

Most building materials   
Advantages:  

Ready to use  

Easy application  

Fast curing  

Service temperature range -50oC to +150oC  

Long life weathering performance  

High joint movement accommodation  

Excellent adhesion to most construction materials  

Will not stain porous construction materials such as concrete, marble or granite   
Description:
  
Construction Silicone is a one part, gun applied, neutral cure silicone sealant which cures rapidly to form a durable, weathertight seal. Construction Silicone remains permanently flexible and weatherproof under a wide range of climatic conditions. The unique polymers utilised in this 'state of the art' sealant combine to provide the outstanding weathering performance, for which silicone sealants are renown, with no risk of staining porous building materials.    

 

Design criteria:
  

Joint design: Moving joints should be designed and suited to minimise stresses imposed on the joint sealant. All movement joints should be designed with an optimum width to depth ratio of 2:1 with the overriding requirement that the sealant depth must not be less than 8 mm on nonporous surfaces and not less that 12 mm on porous surfaces.  

 

Bond breakers and joint fillers: In moving joints, the sealant must not be allowed to bond to the back face of the joint. Prevention of 3 sided adhesion is achieved by installing either a polyethylene bond breaker tape, or through the use a polyethylene foam backing rod.     

  
Properties:
   

Data quoted are typical for this product but do not  

constitute a specification.  

 

Form: Non slump thixotropic paste  

Colours: Emer-Seal colour range  

Movement accommodation factor: Plus 50% / minus 30% (80% total)  

Typical hardness Shore 'A': 18 - 25  

Physical or chemical change: Chemical cure (non-acid)  

Application temperature: Minimum 5oC  

Service temperature: Minus 50oC - 150oC  

Tooling time: 20 minutes minimum @ 25oC, 65%RH  

Cure rate: Approx. 3 mm for 1st day at 25oC, 65% R.H then 1 mm / day Thereafter     

 

Application instructions
  
Preparation
  
Joint faces must be sound and completely dry, clean and frost free. Oil, grease, curing compounds, form release agents, and all surface contaminants must be completely removed by grinding joint faces or by using Solvent 10. If it is necessary to apply Construction Silicone onto paints or other renewable surface coatings it is recommended that proposed system be carefully tested to ensure that adhesion is acceptable and properties of either the paint or the sealant are not adversely affected by long term contact. Construction Silicone is suitable for use directly onto powder coated metals and Colour Bond steel surfaces.    

 

Priming
  

Construction Silicone has excellent adhesion to most building surfaces without the use of a primer. For optimum results, particularly with moving joints, priming is always recommended.  

 
Primer 9: PVC, fibreglass and many plastic surfaces  

Primer 10: Concrete, brick and most porous substances  

Primer 11: Metals and most non-porous substrates  

Primer 13: Concrete surfaces subject to water immersion  

 

Primer drying times:  

Primer 9 and 11: 30 minutes  

Primer 10: 30 minutes  

Primer 13: 30 minutes - 2 hours  

Reprime if the sealant is not applied within 8 hours after primer application.    

 

Application
  
Fit the sausage of Construction Silicone into a suitable sausage gun (PC 770513), and gun firmly into joint. Ensure sealant is forced well against all joint surfaces to achieve good surface wetting and thus optimum adhesion. Guide nozzle along the joint gradually, applying even pressure to the trigger. The joint must be filled completely at all points.    

 

Tooling
  
Immediately after application the sealant should be tooled. Use a smooth convex tool to produce both the required surface finish and to assist in further forcing the sealant into good contact with the joint faces. The use of use soapy water as a tooling aid is not recommended as the cure of the sealant may be adversely affected.    

 

Cleaning
  
Equipment should be cleaned promptly by wiping with solvent 10, as cured sealant is very difficult to remove. Cured sealant can only be removed by mechanical methods. Soaking the equipment in Solvent 10 makes removal of cured sealant easier.    

 

Limitations
  
Elastomeric sealants such as Construction Silicone should not be applied in close proximity to bituminous materials or products containing reclaimed rubber (e.g. some tile adhesives).    

 

Estimating Supply
  

Construction Silicone: 600 ml sausage  

Primer 9, 10 and 11: 250 ml cans  

Primer 13: 250 ml packs  

Solvent 10: 4 and 20 litre drums
  
Coverage
  
Each 600 ml sausage of Construction Silicone will seal 6 metres of a 10 x 10 mm joint or 3 metres of a 10 x 20 mm joint. As a guide, a 250 ml tin of primer will be required for every 12 sausages on porous surfaces or for every 50 sausages on non-porous surfaces.
  
Storage
  

Shelf life 12 months in unopened containers stored under cool, dry conditions.

 

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