Antimony Trioxide, Antimony Trioxide Masterbatch, Diantimony Trioxide, Antimony Oxide EVA, ATO, 1309-64-4, 1327-33-9

Antimony Trioxide, Antimony Trioxide Masterbatch, Diantimony Trioxide, Antimony Oxide EVA, ATO, 1309-64-4, 1327-33-9

1. Chemical Identity & Basic Properties

2. Production Methods

Antimony trioxide is produced industrially by two main routes:

1. Volatilization Roasting
   Antimony ore (mainly stibnite, Sb₂S₃) is roasted in air:

   2 Sb2S3+9 O2→2 Sb2O3+6 SO22Sb2​S3​+9O2​→2Sb2​O3​+6SO2​

   The Sb₂O₃ vapor is collected in a baghouse or condenser. Purity typically reaches 99.5–99.8%.

2. Hydrometallurgical / Wet Process
   Antimony metal is dissolved in an oxidizing agent (e.g., nitric acid, hydrogen peroxide) followed by hydrolysis. This yields high‑purity Sb₂O₃ (>99.9%) used in catalysts and electronic applications.

3. Flame Retardant Mechanism

Antimony trioxide is not a flame retardant by itself; it acts synergistically with halogenated compounds (chlorine‑ or bromine‑based). The mechanism:

• At fire temperatures (200–300 °C), the halogen source decomposes to release HX (HCl or HBr).

• Sb₂O₃ reacts with HX to form antimony oxyhalide (SbOX) and then antimony trihalide (SbX₃):

  Sb2O3+6 HX→2 SbX3+3 H2OSb2​O3​+6HX→2SbX3​+3H2​O

• SbX₃ acts in the gas phase by scavenging highly reactive H• and OH• radicals, interrupting the combustion chain reaction.

• It also condenses on the material surface, forming a protective char layer that limits oxygen diffusion.

Because of this synergy, UL94 V‑0 ratings can be achieved with only 4–8 wt% Sb₂O₃ together with a suitable halogenated flame retardant.

4. Detailed Applications

4.1 Flame Retardant (Largest Market)

• Polymers: PVC, PE, PP, ABS, PS, EVA, polyesters, epoxy, polyurethane.

• End products: Wire & cable insulation, electrical sockets, automotive parts, construction foams, coatings, textiles (curtains, upholstery).

• Typical dosage: 2–10 wt% depending on polymer and desired flame rating.

4.2 Glass, Ceramics & Enamel

• Opacifier: Imparts white color and opacity in glass, ceramic glazes, and porcelain enamels.

• Decolorizer: Removes greenish tint caused by iron impurities in glass production.

4.3 Catalyst

• PET production: Used as a polycondensation catalyst in the manufacture of polyethylene terephthalate (bottles, fibers). It is typically dissolved in ethylene glycol before addition.

4.4 Pigment & Coatings

• Known as Pigment White 11. Used in high‑temperature coatings (industrial ovens, ceramics) for its thermal stability and UV opacity.

4.5 Friction Materials

• Added to brake linings and pads to improve thermal stability and stabilize the coefficient of friction while reducing fire risk.

4.6 Nanotechnology & Specialties

• Nano‑sized Sb₂O₃ (20–100 nm) is used in advanced flame retardant systems, transparent conductive coatings, and solar cell research.

5. Masterbatch Form: Antimony Trioxide + EVA Carrier

To overcome the health and processing issues of fine powder, a masterbatch containing 90 % Sb₂O₃ and 10 % EVA (ethylene‑vinyl acetate) carrier is widely used.

Key Advantages

• Dust‑free: Eliminates inhalation exposure; simplifies compliance with REACH, OSHA, and local occupational safety regulations.

• Excellent dispersion: The EVA carrier acts as a compatibilizer, ensuring homogeneous distribution in the polymer matrix. Prevents agglomeration, which can impair flame retardancy and mechanical properties.

• Process stability: Easy gravimetric or volumetric dosing; reduced material loss (yield loss); smoother extrusion/injection molding with fewer filter screen changes.

• Thermal compatibility: EVA decomposes around 300 °C, which matches the temperature range where Sb₂O₃ becomes active in the flame retardant reaction.

Typical Applications for Masterbatch

• Wire & cable insulation (PVC, XLPE, EVA‑based compounds)

• Technical plastics (PP, ABS, HIPS, PA)

• Films and sheets (construction, packaging)

• Electrical & electronic components (connectors, housings)

• Masterbatch and compound production

6. Safety & Toxicology

• Classification (EU CLP):

  • Carcinogenicity Category 2 (H351 – Suspected of causing cancer)

  • Acute toxicity (inhalation) Category 4 (H332 – Harmful if inhaled)

• IARC Group: 2B (possibly carcinogenic to humans). Evidence is limited in humans but sufficient in animal studies (lung tumors).

• Occupational Exposure Limits (8‑hour TWA):

  • ACGIH: 0.5 mg/m³ (respirable fraction)

  • EU (2019/1831): 0.5 mg/m³

• Toxicokinetics: Inhaled particles are cleared slowly from the lungs; systemic absorption is low, but retention can be long (days to weeks). Excretion mainly via urine and feces.

• Environmental: Low water solubility, but can become mobile under acidic conditions. Toxic to aquatic organisms.

• Risk Management: When using powder, local exhaust ventilation, dust collection systems, and P3 respirators are mandatory. Masterbatch formulations essentially eliminate dust‑related risks.

7. Comparison with Other Antimony Oxides

8. Regulatory Landscape

• REACH (EU): Antimony trioxide is listed as a Substance of Very High Concern (SVHC) due to its carcinogenicity classification. Authorisation may be required for certain uses.

• RoHS: Not restricted in electrical/electronic equipment, though waste management is regulated.

• GHS Label: Health hazard pictogram (GHS08) and exclamation mark (GHS07).

• Transport: ADR/RID Class 6.1 (toxic substance), UN No 1549.

9. Market & Economic Notes

• About 70 % of global antimony trioxide consumption is for flame retardant applications.

• China accounts for more than 80 % of world production; other producers are in Belgium, the USA, and Australia.

• Prices are strongly linked to antimony metal markets. Environmental restrictions in China have periodically caused supply tightness.

• Masterbatch grades command a 20–30 % price premium over powder, but the improved safety, processability, and reduced waste make them cost‑effective for many converters.

Alternatives to Antimony Trioxide (Sb₂O₃)

Antimony trioxide is widely used as a flame retardant synergist, especially with halogenated compounds. However, due to increasing regulatory pressure, supply chain volatility, and sustainability concerns, many industries are shifting toward safer and more stable alternatives. Below are the main classes of alternatives, their mechanisms, advantages, and typical applications.

1. Metal Phosphinates (Halogen‑Free)

Chemical class: Aluminum or zinc salts of phosphinic acid.

Mechanism:

• Act in the gas phase by scavenging free radicals (H•, OH•).

• Form an intumescent (foaming) char layer in the condensed phase, insulating the material from heat and oxygen.

Advantages:

• Halogen‑free and contain no antimony.

• Low density – enable lightweight parts.

• Recyclability – flame retardant performance is retained after reprocessing.

• Reduced smoke density compared to halogenated systems.

Typical polymers: Polyamide (PA), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), epoxy resins.

2. Zinc‑Based Synergists

2.1 Zinc Borate

Mechanism:

• Promotes char formation in the condensed phase.

• Forms a glass‑like layer that acts as a barrier.

• Suppresses smoke and afterglow.

Advantages:

• Antimony‑free.

• Can partially or completely replace antimony trioxide in PVC, elastomers, and some engineering plastics.

• Reduces peak heat release rate (PHRR) and total smoke release (TSR).

Typical polymers: PVC, polyethylene (PE), polypropylene (PP), elastomers, polyamides.

2.2 Zinc Stannate & Zinc Hydroxystannate

Mechanism:

• Act as synergists with halogenated flame retardants in the gas phase (similar to antimony trioxide).

• Also promote char formation in the condensed phase.

Advantages:

• Comparable or even higher flame retardant efficiency than antimony trioxide.

• High thermal stability (suitable for high‑processing‑temperature polymers).

• Lower toxicity profile.

Typical polymers: Polyesters, polyamide, PVC, thermoplastic elastomers.

3. Calcium Hypophosphite

Chemical class: Hypophosphite salt (Ca(H₂PO₂)₂).

Mechanism:

• Decomposes to release phosphorus‑containing gas‑phase active species.

• Promotes charring in the condensed phase.

• Shows synergistic effects with minerals such as talc.

Advantages:

• Antimony‑free.

• Low toxicity.

• Can meet stringent smoke and flame requirements (e.g., railway, construction).

Typical polymers: ABS, HIPS, and other styrenic copolymers.

4. Organic‑Inorganic Hybrid Synergists

Chemical class: Modified minerals, boron‑based hybrids, or proprietary inorganic‑organic systems.

Mechanism:

• Accelerate char formation in the condensed phase.

• Provide anti‑dripping properties.

• Suppress smoke and heat release.

Advantages:

• 100% antimony‑free.

• Often more cost‑effective than antimony trioxide.

• Good processing stability and wide polymer compatibility.

• Can be used in both halogen‑containing and halogen‑free systems.

Typical polymers: PVC, polyamide, PP, PE, ABS, HIPS, PBT.

5. Metal Hydroxides (ATH & MDH)

Chemical class: Aluminum trihydroxide (ATH, Al(OH)₃) and magnesium dihydroxide (MDH, Mg(OH)₂).

Mechanism:

• Endothermic decomposition – absorb significant heat.

• Release water vapor, which dilutes combustible gases.

• Form a protective oxide layer on the material surface.

Advantages:

• Halogen‑free and antimony‑free.

• Very low toxicity and smoke generation.

• Low cost.

Limitations:

• Require high loadings (typically >50 wt%) to achieve good flame retardancy.

• Can negatively affect mechanical properties.

• Decompose at relatively low temperatures (ATH ~200 °C, MDH ~340 °C), limiting their use in high‑temperature processing polymers (e.g., PA, PBT).

Typical polymers: PE, PP, EVA, rubber, low‑temperature applications, cables.

6. Nanoclays & Layered Silicates

Chemical class: Organically modified montmorillonite, sepiolite, etc.

Mechanism:

• Form a reinforced char layer (nanocomposite structure) that acts as a barrier to heat and mass transfer.

• Improve thermal stability and reduce flammability at low addition levels.

Advantages:

• Effective at low loadings (1–5 wt%).

• Antimony‑free, often used in combination with other flame retardants.

• Can improve mechanical properties (modulus, strength).

Challenges:

• Dispersion quality is critical; poor dispersion reduces effectiveness.

• Not all polymers are compatible; proper surface modification is required.

Typical polymers: Polyamide, PP, epoxy, thermoplastic blends.

Comparison Overview

Key Considerations When Switching from Antimony Trioxide

1. Not a direct drop‑in replacement
   Each alternative requires formulation optimization. Compatibility with the polymer matrix, processing conditions, and other additives (e.g., impact modifiers, stabilizers) must be evaluated.

2. Flame retardancy standards
   Different applications demand specific performance levels: UL94 V‑0, V‑2; IEC 60332 (cables); EN 45545 (railway); FAR 25.853 (aviation). The chosen alternative must be tailored to meet the required standard.

3. Smoke and toxicity
   Halogenated systems with antimony trioxide can generate high smoke and toxic gases (HBr, antimony compounds) during fire. Halogen‑free alternatives generally offer lower smoke and toxicity, which is increasingly important for enclosed spaces (buildings, trains, aircraft).

4. Processing conditions
   Some alternatives (e.g., metal hydroxides) degrade at the processing temperatures of high‑performance polymers. Ensure thermal stability during compounding and molding.

5. Cost and supply security
   Antimony prices are volatile, and supply is heavily concentrated in a few regions. Alternatives that can be sourced regionally may provide better supply chain stability.

6. Recyclability
   Many halogen‑free alternatives (especially phosphinates) retain their flame retardant performance after recycling, whereas some traditional systems lose effectiveness.

Antimony Compounds and Their Applications

Detailed Explanations

Flame Retardants

• Antimony trioxide is the most widely used antimony compound for flame retardancy. It acts synergistically with halogenated (chlorine or bromine) flame retardants. During fire, it forms antimony trihalides in the gas phase, which scavenge reactive H• and OH• radicals, effectively interrupting combustion. It is used in PVC, polyolefins, ABS, engineering plastics, cables, textiles, and coatings.

• Antimony pentoxide is employed in halogen‑free flame retardant systems. It is typically used as a colloidal dispersion that promotes char formation in the condensed phase, often combined with phosphorus‑based additives.

• Sodium antimonate and potassium antimonate are also used as halogen‑free flame retardants, especially in applications requiring low smoke and toxicity.

Catalysts

• Antimony trioxide, antimony(III) acetate, and antimony glycolate are used as polycondensation catalysts in the production of polyethylene terephthalate (PET) for bottles, fibers, and films. They offer high catalytic activity with minimal side reactions.

Glass, Ceramics, and Enamels

• Antimony trioxide and sodium/potassium antimonate serve as opacifiers (creating white opacity) and decolorizers (removing greenish tints caused by iron impurities). They also act as fining agents to eliminate gas bubbles in molten glass.

Pyrotechnics

• Antimony trisulfide produces a brilliant white light and stable burning in fireworks, flares, and explosives. Antimony pentasulfide gives a golden‑yellow color.

Battery Industry

• Antimony metal is alloyed with lead to produce battery grids for lead‑acid batteries. The antimony increases mechanical strength and cycle life. Modern formulations often use low‑antimony or antimony‑free alloys to reduce water loss (gassing).

Organoantimony Compounds

• Compounds such as triethylantimony and triphenylantimony are used as dopant sources in metalorganic vapor phase epitaxy (MOVPE) for semiconductor manufacturing. Some organoantimony compounds also find use as biocides and stabilizers, though their high toxicity limits widespread application.

Advanced Materials & Nanotechnology

• Nano‑sized antimony trioxide and antimony trisulfide are investigated for optoelectronic devices, sensors, and next‑generation solar cells (e.g., Sb₂S₃ thin‑film photovoltaics). Nanoparticles can enhance flame retardant efficiency at lower loadings.

Regulatory and Safety Notes

• Many antimony compounds, especially antimony trioxide, are classified as suspected carcinogens (IARC Group 2B, EU CLP Category 2). Occupational exposure limits apply (e.g., 0.5 mg/m³ for Sb₂O₃ as an 8‑hour TWA).

• REACH (EU) lists antimony trioxide as a Substance of Very High Concern (SVHC).

• RoHS does not generally restrict antimony compounds in electrical/electronic equipment, but waste management regulations may apply.

• Antimony trichloride and pentachloride are corrosive and hydrolyze vigorously with water; proper handling and personal protective equipment are essential.

Sectoral Suitability: Sb₂O₃ Powder vs. Sb₂O₃ +10% EVA Masterbatch

Legend

• ✅ Suitable – commonly used and technically feasible

• ⚠️ Limited – possible but with significant drawbacks (dust, dispersion issues)

• ❌ Not applicable – technically incompatible or not used in practice

Summary of Key Differences

Antimony Trioxide (Sb₂O₃) – Most Searched Names

Turkish Search Terms

• Antimon trioksit

• Antimon oksit

• Antimon beyazı

• Diantimon trioksit

• Antimon (III) oksit

• Antimon tozu

• Antimon nanotoz

• Alev geciktirici antimon

• Antimuan oksit

• Sb₂O₃

English Search Terms (Global)

• Antimony trioxide

• Antimony oxide

• Antimony white

• Diantimony trioxide

• Antimony(III) oxide

• Antimony trioxide powder

• Antimony trioxide nanoparticles

• Flame retardant antimony

• ATO (abbreviation)

• Sb₂O₃

Technical / Industry‑Specific Terms

• Flame retardant synergist

• Pigment White 11

• CI 77052

• Catalytic antimony

• Antimony oxide powder

• Antimony trioxide CAS 1309-64-4

• Antimony trioxide CAS 1327-33-9

Antimony Trioxide +10% EVA Masterbatch – Most Searched Names

Turkish Search Terms

• Antimon trioksit masterbatch

• Antimon masterbatch

• Alev geciktirici masterbatch

• Antimon EVA masterbatch

• Tozsuz antimon

• Granül antimon

• Antimon trioksit granül

• Sb₂O₃ masterbatch

• Antimon katkı granülü

English Search Terms (Global)

• Antimony trioxide masterbatch

• Antimony masterbatch

• Flame retardant masterbatch

• Antimony trioxide + EVA masterbatch

• Dust‑free antimony trioxide

• Antimony trioxide granules

• Sb₂O₃ masterbatch

• ATO masterbatch

• Antimony trioxide concentrate

• Antimony carrier masterbatch

Technical / Industry‑Specific Terms

• Masterbatch for halogenated systems

• Dust‑free flame retardant additive

• EVA‑carrier antimony trioxide

• High‑concentration masterbatch (90%)

• Polymer additive granules

• Antimony trioxide dispersion granules

Additional Search Tips for Better Visibility

1. Include CAS numbers prominently:

   • 1309-64-4 (main industrial grade)

   • 1327-33-9 (alternative for hydrated/amorphous variants)
     Buyers often search “antimony trioxide CAS 1309-64-4” to find technical data sheets and safety documents.

2. Use application‑based keywords:

   • “flame retardant for cables”

   • “PET catalyst”

   • “antimony for plastics”

   • “ABS flame retardant additive”

3. Account for common misspellings:
   Variations like “antimuan oksit”, “antimony trioxid”, “antimony oxid” are frequently typed.

4. Competitive / alternative‑seeker keywords:
   Terms such as “halogen‑free synergist”, “antimony replacement”, “non‑antimony flame retardant” attract users looking for alternatives.

5. Leverage long‑tail keywords:

   • “dust‑free antimony trioxide masterbatch for wire and cable”

   • “high purity antimony trioxide powder for PET”