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Sikasil® WT-470

High-performance, 2-component window bonding adhesive

Sikasil® WT-470 is a 2-component, high-modulus, neutral-curing structural silicone adhesive 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
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

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PRODUCT BENEFITS

Meets requirements of EOTA ETAG 002 and RAL-GZ 716/1
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

Areas of Application

Sikasil® WT-470 has a wide adhesion range on many substrates such as glass, (coated) metal, wood, PVC and many other substrates. In combination with its good mechanical properties, especially the high modulus of elasticity, this makes the adhesive most suitable for structural bonding of insulating glass units into window frames and for back-bedding applications. It is further suitable for highly demanding industrial bonding and sealing applications. This product is suitable for experienced professional users only. Tests with actual substrates and conditions have to be performed ensuring adhesion and material compatibility.

Product Details

Typical Product Data

Properties

Sikasil® WT-470 (A)

Sikasil® WT-470 (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

1.40 kg/l	1.07 kg/l
1.37 kg/l

Mixing ratio

A:B by volume

A:B by weight

10:1

13:1

Viscosity (CQP029-6)

1 100 Pa·s

300 Pa·s

Consistency

Paste

Application temperature

ambient

5 ─ 40 °C

Snap time (CQP554-1)

50 minutes ^A

Tack free time (CQP019-3)

240 minutes ^A

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

Tensile strength (CQP036-1 / ISO 527)

1.9 MPa

100 % modulus (CQP036-1 / ISO 527)

1.0 MPa

Elongation at break (CQP036-1 / ISO 527)

250 %

Tear propagation resistance (CQP045-1 / ISO 34)

6 N/mm

Service temperature (CQP513-1)

-40 ─ 150 °C

Shelf life

15 months ^B

12 months ^B

CQP = Corporate Quality Procedure

^A) 23 °C / 50 % r. h.

^B) storage below 25 °C

Technical Information

CURE MECHANISM

Sikasil® WT-470 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.

When processing Sikasil® WT-470 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-470, 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-470 may be removed from tools and equipment with Sika® Remover-208 or an-other 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-470 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-470, 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.