What Bostik PU 520 Kit Catalyst Base is and why choose it
Bostik PU 520 Kit Catalyst Base is a two-component polyurethane contact adhesive specifically designed for bonding and repairing inflatable structures made of PVC and polyurethanes. Supplied as a liquid base resin with separate hardener, it delivers high initial grab and excellent mechanical strength, making it ideal for demanding industrial and professional applications where flexible yet durable joints are required.
Its toluene-free formula, fast drying time and strong adhesion on plastified PVC and polyurethane substrates make Bostik PU 520 a reliable solution for maintenance, assembly and repair operations on inflatable items and technical fabrics.
Main features
- Contact adhesive in polyurethane base with separate hardener.
- Specially formulated for bonding and repair of inflatable structures (PVC and polyurethanes).
- High initial grab for rapid handling without repositioning.
- High mechanical resistance once fully cured.
- Can be used on plastified PVC, polyurethanes, conveyor belts, tarpaulins, coatings and inflatable boats.
- Toluene-free formula.
- Immediate bond after joining the parts (no adjustment possible).
- Good performance on porous substrates when applied in two coats.
Technical specifications
- Chemical base: Polyurethane.
- Application temperature (material minimum): +10 °C (at lower temperatures the product loses properties).
- Recommended minimum material temperature: +15 °C.
- Mixing ratio (by volume): 750 ml resin to 30 ml hardener.
- Initial viscosity of mixture: approx. 2500 mPa·s.
- Drying time at +20 °C: approx. 15 minutes.
- Open time at +20 °C (maximum): approx. 30 minutes.
- Pot life of mixture at +20 °C: approx. 6 hours.
- Time to reach final strength: after 24 hours at ambient temperature.
- Coverage: 120–150 g/m² per side, depending on substrate porosity.
- Physical state: very viscous liquid.
- Colour: colourless.
- Density (liquid): approx. 0.87 g/cm³.
- Water solubility: insoluble.
- Solid content: approx. 19.80 %.
- Initial boiling point: about 56 °C.
- Flash point: -17 °C.
- Auto-ignition temperature: 343 °C.
- Lower flammability limit: 1.2 % (v/v).
- Upper flammability limit: 13 % (v/v).
- Dynamic viscosity: 2300–2900 mPa·s at 20 °C.
- VOC content: No data available.
- Storage life: 12 months in original, closed packaging, protected from frost, between +10 °C and +30 °C.
- Supplied kit: 750 ml resin + 30 ml hardener (code 30506090).
Applications and use cases
Bostik PU 520 Kit Catalyst Base is designed for professional bonding where a flexible yet highly resistant contact adhesive is required. Typical applications include:
- Repair and bonding of inflatable structures.
- Bonding of plastified PVC and polyurethane sheets or components.
- Repair of inflatable boats and other inflatable equipment.
- Bonding of conveyor belts and technical belts.
- Assembly of tarpaulins, coated fabrics and coverings.
Substrate preparation
- Surfaces must be clean, dry and free from dust and grease.
- On very smooth surfaces (particularly rubbers), light sanding or stripping of the material is recommended.
- Do not apply on very cold materials; minimum material temperature: +15 °C.
Mixing and application
- Immediately before use, pour the hardener into the resin container (ratio 750 ml resin to 30 ml hardener).
- Mix thoroughly until a homogeneous colour is obtained.
- Apply an even coat to both bonding surfaces using a fine notched trowel or brush.
- Allow solvents to evaporate for approximately 15–20 minutes.
- Join the two surfaces and apply strong pressure for about 15–20 seconds. Bond is immediate and cannot be adjusted.
- For very porous substrates, apply two coats of adhesive, waiting at least 1 hour between coats.
- Optimum, definitive adhesion is achieved after 24 hours at ambient temperature.
- Because of the variety of materials and applications, a compatibility test is recommended before full use.
Cleaning
- Fresh product can be cleaned with Bostik Agosolvant cleaner.
FAQ
1. What materials can I bond with Bostik PU 520 Kit Catalyst Base?
This adhesive is specially indicated for inflatable structures and can also bond plastified PVC, polyurethanes, conveyor belts, tarpaulins, coatings and inflatable boats.
2. How long do I have to work with the mixture once the hardener is added?
The pot life of the mixed adhesive is approximately 6 hours at +20 °C.
3. When does the bond reach its full strength?
Final, optimum strength is reached after about 24 hours at ambient temperature.
4. Can the parts be repositioned after joining?
No. Bostik PU 520 provides immediate grab upon contact, so repositioning is not possible once the parts are pressed together.
5. What is the recommended application temperature?
The material being bonded should be at least +15 °C. The general application temperature must not be below +10 °C.
6. How much adhesive do I need?
The typical consumption is 120–150 g/m² per side, depending on the porosity of the substrate.
7. How should I store the product?
Store in its original, closed container, protected from frost, in a tempered location between +10 °C and +30 °C. Under these conditions, the shelf life is 12 months.
8. How can I remove uncured adhesive?
Fresh, uncured adhesive can be cleaned using Bostik Agosolvant.
9. Is the product flammable?
Yes. Bostik PU 520 is classified as a highly flammable liquid (Flammable liquids Category 2) and forms flammable vapour/air mixtures in use.
10. Does the adhesive contain toluene?
No. The formulation is toluene-free.
Section 14 – Transport information
Bostik PU 520 Kit Catalyst Base is classified as a dangerous good for transport.
ADR/RID (Road/Rail)
- UN number: UN1133
- Proper shipping name: Adhesives
- Class: 3 (flammable liquids)
- Packing group: II
- Description: UN1133, Adhesives, 3, II, (D/E)
- Classification code: F1
- Tunnel restriction code: (D/E)
- Limited quantity (LQ): 5 L
- Environmentally hazardous: No
IMDG (Maritime)
- UN number: UN1133
- Proper shipping name: Adhesives
- Class: 3
- Packing group: II
- Description: UN1133, Adhesives, 3, II, (-17 °C c.c.)
- Marine pollutant: Not classified as marine pollutant (NP).
- Limited quantity (LQ): 5 L
- EMS code: F-E, S-D
IATA (Air)
- UN number: UN1133
- Proper shipping name: Adhesives
- Class: 3
- Packing group: II
- Description: UN1133, Adhesives, 3, II
- Limited quantity (LQ): 1 L
- Special provision: A3
- ERG code: 3L
Section 8 – Personal protective measures
Due to its solvent content and classification as a highly flammable, eye-irritant mixture that may cause drowsiness or dizziness and is harmful to aquatic life, appropriate personal protection must be used when handling Bostik PU 520 Kit Catalyst Base.
Personal protective equipment (PPE)
- Eye and face protection: Tight-fitting safety goggles and, if there is a risk of splashing, a face shield. Eye protection must conform to EN 166.
- Hand protection: Protective gloves. Breakthrough time will depend on glove material, thickness and temperature.
- Skin and body protection: Suitable protective clothing, including antistatic footwear and fire/flame-resistant clothing. Plastic or rubber gloves and an apron are recommended.
- Respiratory protection: If ventilation is insufficient, use appropriate respiratory protection. In case of mist, spray or aerosol formation, wear suitable respiratory protection and protective suit. Recommended filter type: organic gas and vapour filter conforming to EN 14387.
Safety and hygiene recommendations
- Avoid breathing vapours and prevent contact with skin, eyes and clothing.
- Use only with adequate local exhaust ventilation, especially in confined areas.
- Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
- Repeated exposure may cause skin dryness or cracking.
- Do not eat, drink or smoke while using this product. Wash hands before breaks and after handling.
- Prevent release to the environment; the mixture is harmful to aquatic life with long lasting effects.
Contenido generado por IA
