Supex 7221 Polyurethane Adhesive

Supex 7221: Best Rockwool Adhesive & Honeycomb Adhesive – Premium PU Glue in India

Discover Supex 7221 – The Ideal Rockwool and Honeycomb Adhesive

You need a strong bond for insulation panels. Supex 7221 delivers it reliably. This one-part polyurethane (PUR) adhesive bonds Rockwool, honeycomb cores, metals, and more. Manufacturers in India trust it for construction, fire doors, and sandwich panels. Moreover, it cures with air moisture for tough, flexible joints. Therefore, it excels as the top rockwool adhesive and honeycomb adhesive.

First, see why this matters. Rockwool provides fire resistance and insulation. Honeycomb cores keep panels light yet strong. Weak adhesives fail under heat or vibration. However, Supex 7221 prevents that. It creates durable, high-strength bonds that last.

Key Features of Supex 7221 Polyurethane Adhesive

Supex 7221 stands out among insulation adhesives. Check these highlights:

• One-part formula – No mixing required; easy to apply.
• Solvent-free and low-VOC – Safe for users and the environment.
• Moisture-curing – Reacts with air humidity for reliable strength.
• High heat and fire resistance – Matches Rockwool’s properties.
• Excellent moisture, chemical, and vibration resistance – Handles tough conditions.
• Fast initial grab – Handling strength in 10–15 minutes.
• Flexible bond – Absorbs movement without cracking.
• No shrinkage – Ensures even, clean results.
• Versatile adhesion – Bonds metals (steel, aluminum), Rockwool, paper/aluminum honeycomb, wood, plastics, composites, glass, and laminates.
• Coverage – 100–200 g/m² depending on surfaces.

Additionally, it offers quick curing in presses. This speeds up production.

Why Choose This Rockwool Adhesive and Honeycomb Adhesive?

One-part PUR adhesives like Supex 7221 outperform many options. They cure consistently without extra activators. For example, they bond porous materials well. In contrast, some glues weaken in humid or hot settings. Supex 7221 maintains strength through temperature changes.

Engineers prefer it for structural work. It reduces weight while boosting durability. Plus, its eco-friendly design fits modern regulations. As a result, it suits sustainable projects in India.

Common Applications for Supex 7221

Use Supex 7221 in these key areas:

• Rockwool bonding – Attach slabs to metal, concrete, brick, or plaster in ETICS systems, facades, roofs, walls, and fire doors.
• Honeycomb structures – Join paper or aluminum cores to outer sheets in sandwich panels for buildings, vehicles, boats, and aircraft.
• Insulation panels – Bond Rockwool in HVAC, boilers, pipelines, acoustic ceilings, studios, and industrial enclosures.
• Sandwich elements – Create lightweight, high-strength composites with wood, foams, or metals.
• Other uses – General construction and industrial insulation bonding.

It handles porous and smooth surfaces equally well. Therefore, one adhesive covers diverse needs.

Easy Application Steps for Supex 7221

Apply it simply. Follow these steps:

1. Clean surfaces thoroughly. Remove dust, grease, and contaminants.
2. Ensure materials stay dry (avoid wet application unless misting non-porous sides).
3. Apply evenly with spatula, roller, doctor blade, or spray.
4. For non-porous substrates, add light water mist to introduce moisture.
5. Join surfaces immediately for full contact.
6. Press with at least 0.6 N/mm² (e.g., 30 minutes at 70°C in a press).
7. Allow 1–4 hours curing based on temperature; full strength develops over time.

Clean uncured residue with Supex Cleaner. Remove cured adhesive mechanically. Store sealed below 25°C for up to 8–9 months shelf life.

FAQs

1. What is Supex 7221 and what is it primarily used for?

Supex 7221 is a premium one-part polyurethane (PUR) adhesive, solvent-free and low-VOC. It is the best rockwool adhesive and honeycomb adhesive in India, used for bonding Rockwool insulation slabs to metal, concrete, brick, or plaster in ETICS systems, facades, roofs, walls, and fire doors. It also excels in honeycomb panel fabrication (bonding paper/aluminum honeycomb cores to outer sheets in sandwich panels for buildings, vehicles, boats, aircraft), HVAC insulation, acoustic ceilings, and lightweight composites.

2. What materials (substrates) does Supex 7221 bond effectively?

Supex 7221 provides excellent adhesion to a wide range including Rockwool, paper/aluminum honeycomb cores, metals (steel, aluminum), wood, sheet metal, panels, ceramic wool, rigid foams (polystyrene, polyurethane), thermocol, plastics, composites, glass, and laminates. It bonds both porous and smooth surfaces reliably.

3. Is Supex 7221 a one-part or two-part adhesive? Does it require mixing?

It is a one-part formula—no mixing required. This makes application quick and easy compared to two-part systems.

4. How long does Supex 7221 take to cure?

It develops handling/initial grab strength in 10–15 minutes (fast initial tack). Full curing typically takes 1–4 hours depending on temperature, humidity, and substrate. For optimal results in production, use pressing (minimum 0.6 N/mm² for 30 minutes at 70°C). Full bond strength develops over time with moisture curing.

5. What is the recommended application method for Supex 7221?

Apply evenly using a spatula, doctor blade, roller, or spray gun. Prepare surfaces to be clean, dry, and free of dust/grease. For non-porous substrates or low-humidity conditions, lightly mist with water (never spray directly onto bare metal—mist the opposite substrate or adhesive). Join surfaces immediately and apply uniform pressure during curing.

6. What coverage can I expect with Supex 7221?

Coverage is approximately 100–200 g/m² (100–200 GSM), depending on substrate porosity, surface condition, and application method.

7. What temperature range is suitable for applying Supex 7221?

Apply between 10°C and 35°C for best results. It offers high heat and fire resistance once cured, matching Rockwool properties, and maintains performance in demanding Indian climates.

8. How should I store Supex 7221 to maintain its shelf life?

Store in a cool, dry place below 25°C in the original sealed container. Shelf life is up to 9 months from manufacturing date (best before 8–9 months). Seal tightly immediately after use to prevent moisture ingress, as it is moisture-curing. Use opened containers as soon as possible.

9. Is Supex 7221 safe and eco-friendly?

Yes—it is solvent-free, low-VOC, and environmentally friendly. It complies with modern regulations (REACH-like standards) and is safe for users in industrial settings like construction and panel manufacturing.

10. How do I clean uncured or cured Supex 7221 adhesive?

Remove uncured adhesive and residue using Supex Cleaner or a suitable solvent. Once fully cured, it can only be removed mechanically (e.g., scraping or sanding).

11. Why choose Supex 7221 over other adhesives for rockwool or honeycomb bonding?

It offers fast grab, flexible yet strong bonds, no shrinkage, excellent moisture/chemical/vibration resistance, and high heat/fire performance. As a one-part PUR, it cures reliably without activators, outperforms many alternatives in humid/hot conditions, and supports faster production in Indian manufacturing.

12. Can Supex 7221 be used for fire doors or sandwich panels?

Yes—it is specifically designed for fire doors (bonding Rockwool insulation) and sandwich panels (honeycomb core to sheets), providing durable, fire-resistant bonds that enhance safety and longevity.

Benefits for Indian Manufacturers

India’s construction and insulation sectors expand quickly. Supex 7221 supports this growth with consistent quality and pan-India supply. It enhances panel safety, fire performance, and longevity. Plus, Supex offers expert guidance pan India.

Choose Supex 7221 today. It provides superior bonding for Rockwool and honeycomb applications. For the best rockwool adhesive, honeycomb adhesive, and polyurethane solution in India, this product leads the market.