Everbuild Silicone 825 Buff 380ml
Low-modulus, neutral-cure silicone for facade and expansion joints with high movement capability. Bonds to most construction materials. Buff finish suits natural stone and light brickwork.
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Product Overview
Low-modulus, neutral-cure silicone for facade and expansion joints with high movement capability. Bonds to most construction materials. Buff finish suits natural stone and light brickwork.
Delivery & Returns Information
How Our Delivery Works
We work with a nationwide network of trusted suppliers. As a result, items in your basket may be supplied by different suppliers and delivered separately. Where this applies, you'll see multiple delivery charges at checkout. We always aim to group products from the same supplier to keep delivery costs as low as possible.
Delivery Areas & Charges
Delivery charges listed on our website apply to mainland UK, excluding the following postcode areas: AB, CF, DD, DG, FK, KW, IV, LA, LD, LL, NP, PA, PH, SA, SY
If your delivery address falls within one of these postcode areas, we’ll be in touch before processing your order to confirm any additional delivery costs.
Please note: We do not currently offer delivery outside the UK mainland.
Standard (Nationwide) Delivery
| Screws & Fixings and Adhesives & Sealants | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £50 | £5 ex. VAT |
| Over £50 ex. VAT | FREE |
| Insulation, Plasterboard and Drylining Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £350 | £35 ex. VAT |
| Over £350 ex. VAT | FREE |
| Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 | £10 ex. VAT |
| Over £300 ex. VAT | FREE |
Express Delivery
| Express Delivery - Insulation and Plasterboard & Drylining | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £400 | £50 ex. VAT |
| Over £400 ex. VAT | £35 ex. VAT |
| Express Delivery - Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 | £50 ex. VAT |
| Over £300 ex. VAT | £35 ex. VAT |
Returns
We offer a 30 day returns policy on any faulty products.
Key Features
- {{timeline}} Accommodates significant joint movement
- {{check_circle}} Maintains form during vertical or overhead application
- {{fitness_center}} Provides high flexibility and low stress on substrates
- {{commit}} Ideal for perimeter and expansion joints
Technical Specification
| Size: | 380ml |
|---|---|
| Sales Unit: | Each |
| Brand: | Everbuild |
| Manufacturer's Reference: | 825BUFF |
| Colour: | Buff |
Technical Downloads
Product Overview
Everbuild Tecnic Silicone 825 Buff supplied in a 380ml cartridge is a low modulus, neutral cure, alkoxy-based silicone sealant designed for professional construction, glazing, and façade applications.
It provides exceptional adhesion to both porous and non-porous substrates, including glass, aluminium, uPVC, polycarbonate, and wood, without the need for primer in most cases. Its high viscosity, non-slump formulation ensures precise bead control during application and excellent tooling for large joint installations.
Once cured, it maintains flexibility and performance under dynamic movement, with a ±35% movement capability and long-term resistance to weathering and UV exposure.
The silicone also demonstrates excellent chemical resistance to fumed hydrogen peroxide and formaldehyde, making it suitable for demanding industrial environments.
The buff colour provides a warm, neutral tone suited to stone, brick, and light masonry finishes.
Features & Benefits
- Low Modulus Neutral Cure Formulation: Provides high flexibility and low stress on substrates, ideal for perimeter and expansion joints.
- Excellent Adhesion: Bonds to glass, metals, uPVC, plastics, wood, and coated surfaces without the need for priming in most cases.
- Weather and UV Resistant: Long-lasting performance for external façades and glazing under extended weather exposure.
- High Viscosity Non-Slump Formula: Maintains form during vertical or overhead application, allowing smooth, clean joint lines.
- Movement Capability ±35%: Accommodates significant joint movement without cracking or loss of adhesion.
- Certified Performance: Conforms to ISO11600 F25LM and G25LM, ASTM C920, and EN15651 standards for façade, glazing, and sanitary use.
- Buff Colour Finish: Provides a natural, subtle joint line ideal for blending with stone, brickwork, and other warm-toned façade materials.
Applications
- Perimeter Sealing: Around uPVC, aluminium, and timber windows and doors, internally and externally.
- Curtain Wall and Panel Joints: For sealing pre-formed façade panels and structural glazing.
- Glass and Metal Joints: Suitable for glass-to-glass, glass-to-metal, and glazing perimeter seals.
- Roof and Parapet Weatherproofing: Used in sealing parapets, coping joints, and roofing terminations.
- Expansion Joints: Ideal for movement joints in both horizontal and vertical substrates.
- Insulated Glass Units: For bedding and perimeter sealing of IGU assemblies.
Installation Guidance
- Surface Preparation: Ensure all surfaces are clean, dry, and free from dust, grease, and contaminants before application.
- Priming: Priming is not required for most substrates; however, use Silicone Primer P1 on porous surfaces and Primer NP2 on aluminium if necessary.
- Application Temperature: Apply between +5°C and +40°C for optimum performance.
- Joint Design: Maintain correct joint proportions with a depth no greater than 50% of width, using a backer rod where necessary.
- Tooling: Tool sealant within 30–45 minutes to achieve a smooth finish and ensure full contact with joint sides.
- Cleaning: Remove uncured sealant with white spirit; cured material must be removed mechanically.
Compliance & Performance
- Material Composition: Alkoxy-based, neutral cure silicone.
- Hardness and Elasticity: Shore A hardness 20–30; elongation at break >200%; elastic recovery >80%.
- Temperature Resistance: Service range from -50°C to +150°C.
- Movement Accommodation: ±35% (ASTM C719) and ±25% (ISO11600).
- Certified Standards: ISO11600 F25LM/G25LM, ASTM C920 Class 35, EN15651 CE-marked for façade, glazing, and sanitary use, UL Listed.
- Important Note: Not suitable for use with bitumen, neoprene, or food-grade applications; not paintable and not recommended for mirror bonding.
