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High-performance hindered phenolic antioxidant offering exceptional thermal and oxidative stability.
Low volatility and excellent compatibility with polyolefins, including PP and HDPE.
Non-staining and low odor—ideal for applications requiring high aesthetic and sensory performance.
Good hydrolytic stability, ensuring consistent performance during melt processing and long-term service life.
Synergistic with phosphite co-stabilizers (e.g., Irgafos 168) for enhanced processing and end-use protection.
Polypropylene (PP) fibers and nonwovens for hygiene and medical use.
HDPE blow-molded containers for food and pharmaceutical packaging.
Automotive interior components exposed to elevated temperatures and UV stress.
Thin-walled injection-molded parts requiring minimal extractables and regulatory compliance.
Recycled polyolefin compounds where stabilization against thermo-oxidative degradation is critical.
| Chemical Type | Hindered phenol |
| Product Form | Free-flowing white to off-white powder |
| Appearance | Free-flowing crystalline powder |
| Melting Point | 120–125 °C |
| Assay (by HPLC) | ≥ 99.0% |
| Volatile Matter (105 °C, 2 h) | ≤ 0.3% |
| Heavy Metals (as Pb) | ≤ 10 ppm |
| Primary Applications | Polyolefins (PP, PE), engineering plastics, recycled resins |
Q1: What is the primary function of Bruggolen H321 in polymer systems?
A: Bruggolen H321 is a high-performance hindered phenolic antioxidant designed to protect thermoplastics and elastomers against thermo-oxidative degradation during processing and long-term service life. It effectively scavenges free radicals generated under heat and shear stress, thereby preserving mechanical properties and color stability.
Q2: Which polymer types is Bruggolen H321 most commonly used with?
A: It is widely compatible with polyolefins (e.g., PP, HDPE, LDPE), styrenics (e.g., ABS, PS), and engineering plastics such as polyacetals and polyamides. Its good thermal stability and low volatility make it especially suitable for high-temperature processing applications like extrusion and injection molding.
Q3: How does Bruggolen H321 compare to other primary antioxidants in terms of compatibility and blooming resistance?
A: Bruggolen H321 exhibits excellent compatibility with a broad range of polymers and low tendency to bloom or migrate due to its balanced molecular weight and polarity. This makes it preferable over lower-molecular-weight phenolics in applications where surface clarity, printability, or long-term appearance retention are critical.
Q4: What is the typical dosage range for Bruggolen H321 in polymer formulations?
A: Dosage depends on the polymer type, processing conditions, and end-use requirements, but it is typically used at low concentrations—generally ranging from 0.1% to 2% by weight. Optimization through application testing is recommended to achieve the desired balance of stabilization and cost efficiency.
Q5: Is Bruggolen H321 suitable for food-contact or medical-grade polymer applications?
A: Bruggolen H321 is formulated for industrial and technical polymer applications. For food-contact or medical-grade use, regulatory compliance must be verified case-by-case with the final formulation and processing conditions; users are advised to consult applicable regional regulations and conduct required migration or biocompatibility assessments.
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E-mail: wangxingqiang@ericwchem.com
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