Sikasil®-825

• Certified to ISO11600 F25LM and G25LM.
• UKCA / CE marked under EN15651 for cold climate, façade, glazing and sanitary applications.
• ASTM C719 Class 35.

Alkoxy silicone

12 months from date of manufacture

Store in original unopened containers between +5 °C and +25 °C. Storage outside these parameters may dramatically reduce shelf life

Colours: 1.33 - 1.37 g/cm³

ca. 30

0.35 MPa (ISO 11432, 100 %)

<5 % (ISO 10563)

>70 % (ISO 7389)

0.5 MPa at break

(ASTM C719) ±35 % (ISO 11600) ±25 %

0.10983 W/mK

- 50 °C to + 150 °C

Maximum joint width 50 mm, max depth 50 % of joint width (from 10 mm)
Joint widths are calculated as in BS6213:
Width=(M x 100)/F + M
Where M = movement and F = movement accommodation Factor
For maximum movement accommodation, it is recommended that:
1. The sealant joint depth should be no less than 5 mm.
2. Joint depth should be 5 mm for joints up to 10 mm wide.
3. Joints above 10 mm in width should be half the width in depth up to 20 mm and minimum 10 mm for wider joints.
Joint depth may be adjusted to the correct size using JOINT BACKER ROD.

>200 % (ISO 8339, +23 °C)

+ 5 °C to + 40 °C

mm/1 day approx 2
mm/3 days approx 6
mm/7 days approx 9

30 - 45 minutes (23 °C / 50 % RH)

Sikasil®-825 does not require a primer on most common surfaces, although adhesion tests are recommended prior to full scale application. If the joint is likely to be immersed or if adhesion is poor (especially on porous surfaces) use Sika® Primer-3 N or Sika® Primer-115. To improve adhesion (if required) to non-porous surfaces, prime with Sika® Aktivator-205.

Surfaces must be clean, dry and free from dust, grease and other contaminants. Remove dust with compressed air. Degrease by using a solvent soaked pad, following by wiping with a clean cloth. The following cleaning procedure and materials are recommended:

Uncured sealant - white spirit / Sika® Wonder Wipes.
Cured sealant - mechanically.