Everbuild Everflex Contract AC50 Acoustic Sealant Adhesive White C4 380ml AC50C4

Everbuild Everflex Contract AC50 Acoustic Sealant Adhesive White C4 380ml AC50C4

Size: C4 380ml Cartridge

MPN:  AC50C4

Sika Code: 489513

Barcode: 5029347600358

Product Overview:

The Everbuild Everflex Contract AC50 Acoustic Sealant and Adhesive is a professional-grade, high-strength sealant designed to reduce sound transmission and bond plasterboards and insulation materials to various substrates. Formulated for acoustic performance, it forms a flexible, long-lasting barrier that prevents noise leakage through joints and gaps in walls, floors, and ceilings.

Ideal for both trade and domestic applications, Everbuild AC50 can be used as both a sealant and an adhesive, bonding plasterboard to plasterboard, timber, metal studding, blockwork, and other common building materials. It is also suitable for sealing around partitioning systems, sockets, and service penetrations, ensuring superior acoustic insulation and airtight results.

Key Features and Benefits

• Dual Purpose: Acts as both an acoustic sealant and a powerful internal plasterboard adhesive.

• Effective Sound Barrier: Reduces airborne sound transmission by sealing gaps and joints in plasterboard and dry lining systems.

• Strong Adhesion: Bonds effectively to plasterboard, wood, metal, concrete, and blockwork.

• Permanently Flexible: Maintains elasticity to accommodate movement without cracking.

• Over-Paintable: Can be painted once cured for a seamless finish.

• Mould Resistant: Provides long-term hygiene and durability.

• Non-Flammable and Easy to Apply: Safe to use in various environments and easy to clean up with water.

• Professional Finish: Smooth application for neat, airtight results.

Typical Applications

• Acoustic Sealing: Forms an airtight, soundproof barrier in walls, floors, ceilings, and dry lining systems.

• Plasterboard Bonding: Bonds plasterboard to plasterboard, timber, metal studding, and direct to blockwork.

• Insulation Work: Suitable for bonding Kraft-lined insulation boards and other lightweight materials.

• Partition Systems: Ideal for sealing around sockets, pipe penetrations, and junctions to maintain acoustic integrity.

How to Use

1. Surface Preparation: Ensure all surfaces are clean, dry, and free of dust, grease, and loose material.

2. Application: Cut the cartridge tip, screw on the nozzle, and load into a standard sealant gun. Apply the sealant evenly along the joint or surface.

3. Bonding: For adhesive use, apply the product in a continuous bead and press the materials firmly together.

4. Tooling: Smooth with a damp tool or cloth within 5 minutes for a clean finish.

5. Curing: Allow to dry fully before over-painting or applying further finishes.

Technical Details

• Size: 380ml C4 Cartridge

• Colour: White

• Skin Time: Approx. 15 minutes (at 20°C, 50% RH)

• Full Cure: 24–48 hours depending on conditions

• Application Temperature: +5°C to +40°C

• Base: Acrylic polymer

• Paintable: Yes, with most water-based paints

• Storage Life: 12 months unopened in cool, dry conditions

FAQs – Everbuild Everflex Contract AC50 Acoustic Sealant and Adhesive

1. How does AC50 improve soundproofing?
Everbuild AC50 forms a flexible, airtight acoustic barrier that seals gaps and joints where sound waves would typically pass through, significantly reducing noise transfer between rooms.

2. Can it be used for both new builds and refurbishments?
Yes, AC50 is suitable for both new installations and retrofitting in renovation projects. It’s ideal for plasterboard partitioning, insulation systems, and dry lining.

3. Is this suitable for outdoor use?
AC50 is intended for internal use. While it can resist some moisture, it’s not designed for prolonged external exposure.

4. Can I paint over it?
Yes, once cured, AC50 can be painted with most water-based paints. Allow at least 24 hours for the sealant to dry before painting.

5. How can I ensure effective sound insulation?
Apply AC50 generously to all joints, gaps, and penetrations in walls, floors, and ceilings to maintain a continuous acoustic seal. Always ensure the surface is clean and dry before application.

6. Is it safe to use around electrical fittings?
Yes, AC50 is non-flammable and can be safely used to seal around sockets, switches, and electrical boxes as part of acoustic systems.

7. What’s the difference between AC50 and standard decorators’ caulk?
Unlike standard caulk, AC50 has enhanced acoustic and adhesive properties, making it ideal for professional soundproofing and bonding applications.

8. Can it be used on ceilings and overhead joints?
Yes, its high grab and flexible formula make it suitable for vertical and overhead applications without slumping.

9. Does it shrink over time?
No, the permanently flexible formula prevents cracking or shrinkage, ensuring a long-lasting, secure seal.

10. Is this a water-based or solvent-based product?
AC50 is a water-based acrylic product, making it safe, low-odour, and easy to clean up after use.

Why Choose Everbuild Everflex AC50?
Everbuild Everflex AC50 is the industry standard for acoustic sealing and bonding. Combining excellent soundproofing performance with strong adhesive properties, it delivers professional results in every installation. Whether bonding plasterboard or sealing gaps in walls, floors, and ceilings, AC50 ensures long-term flexibility, durability, and sound reduction — a trusted solution for contractors, builders, and decorators alike.

Everbuild Contract AC50 380ml Data Sheet:

"Always read the Technical Datasheet prior to first use to ensure you have the correct information and  product for your application"

All Plasterboard Adhesives