Product Data Sheet Safety Data Sheet Show all documents

Everbuild Tecnic® Silicone 825

A low modulus, neutral cure silicone sealant

Everbuild Tecnic® Silicone 825 is a low modulus, neutral cure, alcoxy, low odour silicone sealant that adheres to a wide range of both porous and non porous surfaces without the need for priming.

Excellent tooling and slow skinning properties for large scale construction and glazing applications.
Excellent adhesion - adheres to most common surfaces including glass, metals, plastics and wood (painted or unpainted), uPVC and polycarbonate.
Excellent external weathering properties (over many years exposure).
High viscosity non slump formula.
Resistant to fumed Hydrogen Peroxide and fumed Formaldehyde once fully cured.

Shrinkage ISO10563 <5 % Tensile Modulus at 100% Elongation ISO 8339 23°C0.25—0.3 MPaTensile Adhesion Strength at Break0.5 MPaCompressive Modulus 100% ISO 114320.35 MPaMovement Factors Maximum Compression 35 % Maximum Elongation 100 % (for a 20 mm wide joint min 13 mm max 40 mm)

Product Data Sheet Safety Data Sheet Show all documents

Usage

Perimeter pointing internally and externally around PVCu /wood and powder coated aluminium.
Sealing and as an adhesive onto PVCu, plastic trims and components. Sealing soft metals such as lead, copper and zinc. Weather sealing and joint sealing to pre-formed panels and curtain walling, glazing sealing and draught proofing. Glass to glass and glass to aluminium sealing. Parapet and roof weather sealing applications.
Ideal for precast concrete and masonry products, including brick, natural stone and terracotta.
Suitable as an expansion joint sealant.
Bedding and sealing of Insulated Glass units.

Advantages

Excellent tooling and slow skinning properties for large scale construction and glazing applications.
Excellent adhesion - adheres to most common surfaces including glass, metals, plastics and wood (painted or unpainted), uPVC and polycarbonate.
Excellent external weathering properties (over many years exposure).
High viscosity non slump formula.
Resistant to fumed Hydrogen Peroxide and fumed Formaldehyde once fully cured.

Packaging

380 ml cartridge

600 ml foil pack

Colour

White, Black, Mid Grey, Dark Grey, Brick Red, Brown, Buff, Beige, Anthracite, Dark Anthracite RAL 7016, Magnolia, Portland Stone, Limestone White

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

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

Product Information

Chemical Base

Alcoxy silicone

Shelf Life

12 months from date of manufacture.

Storage Conditions

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

Density

Colours: 1.33 - 1.37 g/cm³

Technical Information

Shore A Hardness

22-32

Elongation at break

>200 % (ISO 8339, +23 °C)

Movement Capability

(ASTM C719) ±35 % (ISO11600) ±25 %

Elastic Recovery

>70 % (ISO 7389)

Thermal Conductivity

0.10983 W/mK

Service Temperature

-50 °C to + 150 °C

Joint Design

Maximum joint width 50 mm, max depth 50 % of joint width

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 EVERBUILD^® JOINT BACKER ROD.

Application

Application Information

Ambient Air Temperature

+5 °C to +40 °C

Curing Time

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

Skin Time

30-45 minutes

Consumption

Yield

3 linear metres 9 x 9 mm fillet joint (380 ml cartridge)

Application steps

APPLICATION INSTRUCTIONS

PRIMER

Everbuild Tecnic® Silicone 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 3N. To improve adhesion (if required) to non-porous surfaces, prime with Sika^® Aktivator 205.

SUBSTRATE PREPARATION

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. Following cleaning procedure and materials are recommended:

Glass	Degrease with alcohol or MEK
Aluminium, light alloys and stainless steel	Degrease with alcohol or MEK
Other Metals	Lightly abrade then degrease as above
Wood	Lightly abrade surface then remove dust
Plastics	Degrease using an agent recommended by plastics manufacturer
Concrete and other alkaline surfaces	Brush and remove dust
Polyester Powder Coated Aluminium (PPCA)	Sika^® Cleaner P and Sika^®Aktivator-205