Glass fiber auxiliary material BPO paste

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Glass fiber auxiliary material BPO paste

Benzoyl Peroxide (BPO) Paste is a widely used auxiliary agent in the composite industry, particularly in the manufacturing and processing of glass fiber reinforced plastics (GFRP). Functioning primarily as a free radical initiator, BPO paste plays a vital role in initiating the polymerization of unsaturated polyester (UPR) and vinyl ester resins, essential for curing thermosetting resin systems.

Einführung zur Produktleistung

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 hand lay-up, spray-up, Pultrusionsverfahren, filament winding, Und casting applications.

1. Chemical Composition & Structure

Chemical Name: Benzoyl Peroxide (C₁₄H₁₀O₄)
CAS Number: 94-36-0
Form: 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

Vorteile:

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

Besonderheit	Beschreibung
High activity	50-60% BPO content ensures efficient initiation
Safe formulation	Paste form reduces risk of dust ignition or exposure
Improved dispersion	Easy to mix uniformly with base resins
Temperature adaptability	Can be used in ambient or elevated temperatures
Anpassbar	Formulated with various carriers (phthalate, DCPD, or phthalate-free)
Consistent performance	Reproducible curing profiles batch-to-batch

4. Applications Across Industries

a. FRP Molded Products

BPO paste is a key component in the Formen 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. Technical Data Sheet (TDS)

General Properties

Eigentum	Typical Value
Appearance	White to off-white paste
Active Content (BPO)	50% – 60%
Density at 20°C	1.15 – 1.30 g/cm³
pH (aqueous extract)	Neutral to slightly acidic
Flash Point	>80°C (closed cup)
Moisture Content	<0,51 TP3T
Solubility	Insoluble in water
Viscosity (25°C, Brookfield)	3,000 – 8,000 mPa.s (depends on carrier)
Freezing Point	Below 0°C

Thermal Decomposition Data

Parameter	Wert
Self-Accelerating Decomposition	~60°C
SADT (Safe Storage Temp)	35°C (recommended max storage temp)
Activation Energy (Ea)	Approx. 105 kJ/mol

6. Safety and Handling Guidelines

Storage Conditions

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

Package Type	Net Weight	Notes
PE-lined pail	5 kg / 10 kg	Sealed and moisture-protected
Fiber drum	25 kg	Large-scale production usage
IBC bulk	Individuell	For factory-integrated dosage systems

8. Compatibility with Accelerators

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

Accelerator Type	Recommended Dosage	Typical Use Temperature
Cobalt octoate (1%)	0.5% – 1.0%	15 – 35°C
DMA (dimethylaniline)	0.2% – 0.5%	Low-temp conditions
Cobalt napthenate	Similar to octoate	Broad resin systems

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)
RoHS Compliant for electronics-related GRP usage
Transport Classification: UN 3108 (organic peroxide type E, solid)

10. Quality Assurance

Manufacturers typically follow ISO 9001:2015 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

Abschluss

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.

tags:

Glass fiber auxiliary material BPO paste

Serie :

Fiberglass Accessories >

Anwendung

a. FRP Molded Products BPO paste is a key component in the molding 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.

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Produktname :
Glass fiber auxiliary material BPO paste

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FAQ

Q : What is BPO Paste used for in the fiberglass industry? A : BPO (Benzoyl Peroxide) paste is primarily used as a curing initiator for unsaturated polyester and vinyl ester resins. It helps start the polymerization process in various fiberglass manufacturing methods like hand lay-up, spray-up, pultrusion, casting, and filament winding.
Q : Why is BPO used in paste form rather than powder? A : Safer (less risk of explosion or fire) Easier to handle and mix Less dusty More stable during storage and transportation
Q : Can BPO paste be used alone for curing? A : No. BPO paste requires a promoter/accelerator—most commonly cobalt octoate—to decompose properly and generate free radicals for curing.
Q : What is the typical dosage of BPO paste in fiberglass production? A : The standard dosage is usually 1.0% – 2.5% by resin weight, depending on resin type, curing speed required, and temperature.

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