Product Data Sheet Show all documents

Sikasil® WT-480

HIGH-MODULUS, 2-COMPONENT WINDOW BONDING ADHESIVE

Sikasil® WT-480 is a 2-component, neutral-curing structural silicone adhesive with very high modulus, for structural bonding of insulating glass units into window frames and for back-bedding applications.  

  • Meets requirements of EOTA ETAG 002 and RAL-GZ 716/1
  • Very high modulus
  • Excellent adhesion to a wide variety of substrates
  • Outstanding UV and weathering resistance
  • Very good mechanical properties
  • Good gap-filling capabilities
  • Remains flexible over a wide temperature range
  • Long-term durability
 
Product Data Sheet Show all documents

Product Details

Typical Product Data
Properties

Sikasil® WT-480 (A)

Sikasil® WT-480 (B)

Chemical base

2-component silicone

Color (CQP001-1)

 

mixed

White, light grey

Black, dark grey

Black, grey S6

Cure mechanism

Polycondensation

Cure type

Neutral

Density (uncured)

  

mixed

1.4 kg/l

1.1 kg/l

1.4 kg/l

Mixing ratio

A:B by volume

A:B by wight

10:1

13:1

Viscosity (CQP029-6)

1 100 Pa·s

250 Pa·s

Consistency

Paste

Application temperature

ambient

5 ─ 40 °C

Snap time (CQP554-1)

35 minutes A

Tack free time (CQP019-3)

180 minutes A

Shore A hardness (CQP023-1 / ISO 48-4)

60

Tensile strength (CQP036-1 / ISO 527)

2.5 MPa

100 % modulus (CQP036-1 / ISO 527)

2.0 MPa

Elongation at break (CQP036-1 / ISO 527)

140 %

Tear propagation resistance (CQP045-1 / ISO 34)

2.5 N/mm

Service temperature (CQP513-1)

-40 ─ 150 °C

Shelf life (CQP016-1)

15 months C

12 months C

CQP = Corporate Quality Procedure

A) 23 °C / 50 % r. h.

B) For further values including design values see Calculation Value SheetC) stored below 25 °C
Technical Information

CURE MECHANISM

Sikasil® WT-480 starts to cure immediately after mixing the two components.
The speed of the reaction depends mainly on the temperature, i.e. the higher the temperature the faster the curing process. Heating above 50 °C could lead to bubble formation and is therefore not allowed.
The mixer open time, i. e. the time the material can remain in the mixer without flushing or extrusion of product, is significantly shorter than the snap time indicated above.

Application

Application Information

Surface preparation

Surfaces must be clean, dry and free from grease, oil and dust. Surface treatment depends on the specific nature of the substrates and is crucial for a long lasting bond.

Application

The optimum temperature for substrate and sealant is between 15 °C and 25 °C.

Before processing Sikasil® WT-480 both components have to be mixed homogeneously and air-bubble-free in the correct ratio as indicated with an accuracy of ± 10 %. Most commercially available metering and mixing equipment are suitable. For advice on selecting and setting up a suitable pump system, contact the System Engineering Department of Sika Industry.

Consider that the B-component is moisture-sensitive and must therefore only be exposed briefly to air.

Joints must be properly dimensioned.

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.

Tooling and finishing

Tooling and finishing must be carried out within the snap time of the adhesive.

When tooling freshly applied Sikasil® WT-480, press the adhesive to the joint flanks to get a good wetting of the bonding surface. No tooling agents must be used.

 

Removal

Uncured Sikasil® WT-480 may be re-moved from tools and equipment with Sika® Remover-208 or another suitable solvent. Once cured, the material can only be removed mechanically.

Re-usable, usually metallic, static mixer can be cleaned with Sika® Mixer Cleaner.

Hands and exposed skin have to be washed immediately using hand wipes such as Sika® Cleaner-350H cleaning towels or a suitable industrial hand cleaner and water. Do not use solvents on skin.

Overpainting

Sikasil® WT-480 cannot be overpainted.

Application limits

Recommended solution from Sika for structural glazing and window bonding are usually compatible to each other. These solutions consist of products such as Sikasil® SG, IG, WS and WT series. For specific information regarding compatibility between various Sikasil® products and other Sika products contact the Technical Department of Sika Industry.
To exclude materials influencing Sikasil® WT-480, all materials such as gaskets, setting blocks, sealants etc., in direct and indirect contact have to be approved by Sika in advance.
Where two or more different reactive sealants are used, allow the first to cure completely before applying the next one.
The above mentioned Sika process materials may only be used in structural glazing or window bonding applications after a detailed examination and written approval of the corresponding project details by Sika Industry.

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