NBS Source

Application

Suitable for general glazing and weather sealing in curtain wall and building facades.

Description

Dowsil 791 Silicone Weatherproofing Sealant is a one-part, neutral curing, low modulus silicone sealant.


Features and benefits:

  • Ideal for expansion, connection, perimeter and other movement joints.
  • Neutral cure.
  • Low odour.
  • Conforms to ISO 11600-F&G-25LM.
  • Resistant to ozone, ultra-violet radiation and temperature extremes.
  • Joint movement capability ± 50%.


Preparation:

  • Ensure that surfaces to be sealed are clean, dry, sound and grease-free.
  • Porous substrates such as concrete, brickwork, mortar, etc. must be mechanically cleaned of loose particles.

General information

Color

Available in a broad range of colours. Consult manufacturer and insert requirements.

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Material

Silicone

Shape

Formless

Uniclass

Pr_30_31_76_77 Silicone construction joint sealantsPrimary

CAWS

L40/195 Glass to glass jointing

H11/110 Curtain walling

Specification data - Silicone construction joint sealants Enhanced data

Standard

To BS EN ISO 11600.

Third party certification

CE Marked, SNJF, DIN 18540 Class F.

Material

Neutral cure.

Class

F-25LM, G-25LM.

Colour

Available in a broad range of colours. Consult manufacturer and insert requirements.

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Specific gravity

Uncured state.

1.50.

Hardness (shore A)

12 x 12 x 50 mm size T.A. joint (ISO 8339/DIN 2-8339).

29.

Modulus at 100% elongation

As cured after 7 days at +23°C.

0.35 MPa.

TensileStrength

0.75 MPa.

12 x12 x 50 mm size T.A. joint (ISO 8339/DIN 2-8339).

Elongation at break

380%.

12 x12 x 50 mm size T.A. joint (ISO 8339/DIN 2-8339).

Application temperature

+5 to +40°C.

Elastic recovery

12 x 12 x 50 mm size T.A. joint (ISO 8339/DIN 2-8339).

> 90%.

Joint movement

12 x 12 x 50 mm size T.A. joint (ISO 8339/DIN 2-8339).

Joint movement capability: ± 50%.

Capacity

310 ml.

Cartridge.

600 ml.

Sausage.

Shelf life

12 months.

When stored at or below 30°C in the original unopened containers, DOWSIL 791 Silicone Weatherproofing Sealant has a usable life of 12 months from the date of production.

Accessories

Not required.

DOWSIL R40 Universal Cleaner.

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