Its paste form—BPO suspended in a plasticizer or carrier such as phthalate or dicyclopentadiene (DCPD)—makes it easier to handle, safer, and more compatible with various production environments, especially those involving lay-up manuale, spruzzatura, pultrusione, filament winding, E casting applications.

1. Chemical Composition & Structure

• Nome chimico: Benzoyl Peroxide (C₁₄H₁₀O₄)

• Numero CAS: 94-36-0

• Modulo: White or off-white paste

• Typical Concentration: 50-60% active BPO by weight

• Carrier Material: Commonly phthalate esters (e.g., dioctyl phthalate), DCPD, or non-phthalate plasticizers

• Stabilization: Stabilized with moisture-absorbing agents, anticaking additives, or thickeners to ensure safe storage and handling

2. Role in Resin Curing

BPO acts as an initiator of polymerization by decomposing into free radicals at elevated temperatures. When used in conjunction with accelerators such as cobalt octoate, it triggers the rapid and exothermic curing of UPR and vinyl ester systems. This reaction is especially critical in:

• Fiberglass lamination processes

• Automotive FRP parts

• Pultruded profiles

• Transparent castings

• Marine panels

• Composite bathtubs and sanitaryware

Vantaggi:

• Excellent curing at room and elevated temperatures

• Stable and predictable reaction profile

• High compatibility with a broad range of unsaturated resins

3. Product Features and Benefits

4. Applications Across Industries

UN. FRP Molded Products

BPO paste is a key component in the modanatura of FRP components such as tanks, panels, and ducts. It offers consistent curing and ensures mechanical integrity.

B. Hand Lay-Up & Spray-Up

In these methods, BPO paste is used with accelerators to cure each layer of laminate. Its stability and adjustable cure time enhance process efficiency.

C. Pultrusion

Used in continuous manufacturing processes of profiles like rods, bars, ladders, and channels, BPO paste supports fast throughput and low scrap rates.

D. Casting Applications

In clear casting or composite stone, BPO ensures bubble-free, clear finishes with controlled exothermic profiles.

5. Scheda tecnica (TDS)

General Properties

Thermal Decomposition Data

6. Safety and Handling Guidelines

Condizioni di conservazione

• Store in original containers away from sunlight and ignition sources

• Recommended storage temperature: 10°C – 25°C

• Avoid freezing and exposure to moisture

• Keep separated from accelerators (e.g., cobalt salts)

Personal Protective Equipment (PPE)

• Gloves (nitrile or neoprene)

• Safety goggles

• Lab coat or apron

• Proper ventilation during use

Hazards

• Classified as an oxidizing agent

• Avoid contamination with heavy metals or reducing agents

• Can cause skin and eye irritation

• Explosion risk if heated above decomposition point or subjected to friction

7. Packaging Options

8. Compatibility with Accelerators

BPO paste must be used with a suitable accelerator for proper curing. The most common are:

Note: Never premix BPO with accelerators—mix into resin separately and in proper sequence.

9. Environmental & Regulatory Compliance

BPO paste is subject to multiple international regulations due to its oxidizing and irritant properties:

• REACH Registered (Europe)

• TSCA Listed (USA)

• GHS Classified (Globally Harmonized System)

• Conforme alla direttiva RoHS for electronics-related GRP usage

• Transport Classification: UN 3108 (organic peroxide type E, solid)

10. Quality Assurance

Manufacturers typically follow ISO9001:2015 quality systems, ensuring:

• Raw material traceability

• Batch consistency

• In-house QC testing (BPO content, viscosity, stability)

• Customized formulation options based on resin system or processing temperature

11. Technical Support and Customization

Reputable BPO paste suppliers offer technical support, including:

• Cure profile analysis

• Custom-formulated pastes (phthalate-free, low exotherm, fast cure)

• Lab trials with specific resin systems

• Safe transportation advice

• Application troubleshooting and process optimization

Conclusione

BPO paste is an indispensable auxiliary agent in the glass fiber composites industry. Its ability to safely and effectively initiate polymerization has made it a backbone material in fiberglass part manufacturing. Whether used in basic hand lay-up operations or automated pultrusion lines, BPO paste delivers process control, product performance, and production safety.