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Structure Silicon Adhesive:

Sikasil SG20 - High strength structural silicone adhesive

Description:

Sikasil SG-20 is a neutral curing silicone adhesive, which combines mechanical strength with high elongation. It adheres to a wide range of substrates. Sikasil SG-20 is manufactured in accordance with ISO 9001 quality assurance system and the responsible care program.

Product benefits:

Meets requirements of:
  
AS 1288-2006
EOTA ETAG 002 (carries ETA)
EN 13022
ASTM C 1184
Fire rated (EN 11925-2/DIN 4102-B1)
Outstanding UV and weathering resistance
Excellent adhesion to glass, metals, coated metals, plastics and wood

Areas of Application:

Sikasil SG-20 can be used for structural sealant glazing, bonding of solar modules and other high demanding industrial applications. This product is suitable for professional experienced users only. Tests with original substrates and conditions have to be performed to ensure adhesion and material compatibility.

Technical Product Data:

 

Chemical base

1-C silicone

Colour (CQP 001-1)

Black

Cure mechanism

Moisture curing

Cure Type

Neutral

Density (CQP 006-4)

1.37kg/l approx.

Non-sag properties (CQP 061-4 / ISO 7390

< 2 mm approx.

Application temperature

5 - 40C

Skin time (CQP 019-2)

15 min. approx.

Tack-free time (CQP 019-1)

180 min. approx.

Curing speed (CQP 049-1)

See diagram 1

Shore A hardness (CQP 023-1 / ISO 868)

39 approx.

Tensile strength (CQP 036-1 / ISO 37)

2.2 N/mm2 approx.

Elongation at break (CQP 036-1 / ISO 37)

450% approx.

Tear propagation resistance (CQP 045-1 / ISO 34)

7 N/mm approx.

100% modulus (CQP 036-1 / ISO 37)

0.9 N/mm2 approx

Movement accommodation capability (ASTM C 719)

+/- 25%

Thermal resistance (CQP 513-1) Long term
Short term 4 hour
1 hour
180C approx.
200C approx.
220C approx.

Service temperature

-40C to +150C

Water vapour transmission rate (CQP 520-2 / ISO 12572)

18 g H2O/ m2 24 h 2 mm approx.

Shelf life (stored below 25C) (CQP 016-1)

9 months

Cure Mechanism:

Sikasil SG-20 cures by reaction with atmospheric moisture. The reaction thus starts at the surface and proceeds to the core of the joint. The curing speed depends on the relative humidity and the temperature (see diagram 1 below). Heating above 50C to speed up the vulcanisation is not advisable as it may lead to bubble formation. At low temperatures the water content of the air is lower and the curing process proceeds more slowly.

Application Limits:

All Sikasil WS, FS, SG, IG, WT and other engineering silicone sealants and adhesives are compatible with each other. Sikasil SG, IG and WT sealants are compatible with SikaGlaze IG sealants. All other sealants have to be approved by Sika before using them in combination with Sikasil IG-25. Where two or more different reactive sealants are used, allow the first to cure completely before applying the next. Sikasil SG, IG and WT sealants and adhesives may only be used in structural glazing or window bonding applications by experienced professionals and after a detailed examination and written approval of the corresponding project details by the Technical Service Department. The compatibility of gaskets, backer rods, setting blocks and other accessory materials with Sikasil SG-20 must be tested in advance. The above information is offered for general guidance only. Advice on specific applications will be given on request.

Method of application: Surface preparation:

Surfaces must be clean, dry and free from oil, grease and dust. Advice on specific applications and surface pre-treatment methods is available from the Technical Service Department.

Application:

After suitable joint and substrate preparation, Sikasil SG-20 is gunned into place. Joints must be properly dimensioned, as changes are no longer possible after construction. Basis for calculation of the necessary joint dimensions are the technical values of the adhesive and the adjacent building materials, the exposure of the building elements, their construction and size as well as external loads. Joints deeper that 15 mm should be avoided. For more information please contact our Technical Department.

Tooling and finishing:

Tooling and finishing must be carried out within the skin time of the sealant or adhesive. When tooling freshly applied Sikasil SG-20 press the adhesive to the joint flanks to get a good wetting of the bonding surface. No tooling agents should be used.

Removal:

Uncured Sikasil SG-20 may be removed from tools and equipment with Sika Remover-208 or another suitable solvent. Once cured, the material can only be removed mechanically. Hands and exposed skin should be washed immediately using Sika Handclean Towel or a suitable industrial hand cleanser and water. Do not use solvents.

Overpainting:

Sikasil SG-20 is an elastic adhesive and cannot be overpainted.

Further information:

General guidelines for Structural Silicone Glazing with Sikasil Adhesives

Packaging information:

Cartridge

300 ml

Sausage

600 ml

Value Bases:

All technical data stated in this Technical Data Sheet are based on laboratory tests. Actual measured data may vary due to circumstances beyond our control.

Health and Safety Information:

For information and advice regarding transportation, handling, storage and disposal of chemical products, users should refer to the actual Material Safety Data Sheets containing physical, ecological, toxicological and other safety related data.

 

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