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A Comprehensive Guide to Inorganic Flame Retardant Solutions

At Alfa Chemistry, we are at the forefront of flame-retardant technology, offering an extensive portfolio of high-performance inorganic flame retardants designed to meet diverse industrial requirements while prioritizing environmental responsibility.

Our inorganic flame-retardant series is engineered for halogen-free formulations and for customers seeking robust flame performance with balanced mechanical and processing properties. Our portfolio includes high-purity metal hydroxides, synergists and mineral additives, engineered grades for specific polymers, and tailored surface-treated products for improved compatibility.

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Overview of Inorganic Flame Retardants

What Are Inorganic Flame Retardants?

Inorganic flame retardants are engineered materials based on inherently flame-retardant inorganic elements incorporated into polymer substrates in physical dispersion states. These compounds function through chemical or physical changes in either the gas or condensed phase to suppress combustion. At Alfa Chemistry, we specialize in developing advanced inorganic flame retardants containing metals such as Mg, Al, Ca, non-metals including B, Si, N, P, Sb, and transition elements like Mo, V, Fe.

Key Features and Benefits

  • Halogen-free options: Lower smoke and reduced toxic halogenated gases compared to halogenated flame retardants.
  • Thermal stability tailoring: Choice of ATH vs. MDH allows matching to polymer processing windows.
  • Smoke suppression: Many inorganic grades reduce smoke production and promote stable char formation.
  • Mechanical property control: Surface-treated and nano-engineered grades help preserve tensile, impact and elongation properties at practical loading levels.
  • Cost-effective bulk solutions: Mineral hydrates offer reliable performance at competitive costs for large-volume applications.
  • Eco-Friendly Profile: Low toxicity, minimal environmental impact, and compliance with international standards including RoHS, SVHC, PFOS&PFOA, 16P, and PAHs.

Types of Inorganic Flame Retardants

Aluminum Hydroxide (ATH) Flame Retardants

Magnesium Hydroxide (MDH) Flame Retardants

Microencapsulated Red Phosphorus Flame Retardants

Boron Compounds & Borates

Other Inorganic Flame Retardants

Aluminum Hydroxide (ATH) Flame Retardants

Properties: Non-toxic, high stability, minimal toxic gas emission during high-temperature exposure, reduced smoke generation in plastic combustion.

Dehydration Temperature: 235-350°C, providing particularly effective flame retardation during initial plastic combustion.

Applications: At 40% loading, significantly delays thermal decomposition temperature in PE, PP, PVC, and ABS; used in food packaging materials (50% loading) and automotive/construction applications (60% loading).

Surface Treatment: Enhanced compatibility with PE, PP, EVA, and high-temperature engineering plastics like PBT and PA through specialized surface modification.

Recommended Products:

CatalogNamePrice
ACM21645512-13Aluminium trihydroxide, Ground ATH, 4 μmInquiry
ACM21645512-14Ground ATH,Viscosity Optimized Grade, 9 μmInquiry
ACM21645512-17Ground ATH, Low Viscosity Grade, 7.5 μmInquiry
ACM21645512-18Ground ATH, Low Viscosity Grade, 20 μmInquiry
ACM21645512-20Coarse ATH, 90 μmInquiry
ACM21645512-21Coarse ground ATH, 25 μmInquiry
ACM21645512-22Ground ATH, 19 μmInquiry
ACM21645512-26Ground ATH, 3.6 μmInquiry
ACM21645512-27Unground and high whiteness Alumina Trihydrate (ATH), 75 μmInquiry
ACM21645512-31Ground and high whiteness Alumina Trihydrate (ATH), 6 μmInquiry
ACM21645512-6Aluminium trihydroxide, Unground ATH, 55 μmInquiry
ACM21645512-9Aluminium trihydroxide, Ground ATH, 14 μmInquiry

Magnesium Hydroxide (MDH) Flame Retardants

Properties: Excellent flame retardancy, smoke suppression capabilities, non-toxic, high thermal stability during processing.

Decomposition Temperature: 340-490°C, with superior polymer charring effects compared to ATH.

Applications: Effective flame retardation for PP at 50% loading; efficient smoke suppression filler at appropriate concentrations.

Synergistic Effects: Complementary performance with ATH creates enhanced flame retardancy when combined.

Recommended Products:

CatalogNamePrice
ACM1309428Magnesium Hydroxide Nanoparticles / NanopowderInquiry
ACM1309428-10Magnesium Hydroxide, MDH-7.5 μmInquiry
ACM1309428-4Magnesium Hydroxide (Mg(OH)2) Nanopowder/NanoparticlesInquiry
ACM1309428-5Magnesium Hydroxide, MDHInquiry
ACM1309428-8Magnesium Hydroxide, MDH-1.0 μmInquiry
ACM1309428-9Magnesium Hydroxide, MDH-5.5 μmInquiry
ACMA00066979Magnesium Hydroxide Fire Retardant Subject to Activated TreatmentInquiry
ACM1309428-6Precipitated Magnesium Hydroxide MDH for Flame Retardant, 2μmInquiry
ACM1309428-7Precipitated Magnesium Hydroxide MDH for Flame Retardant, 3.5μmInquiry

Microencapsulated Red Phosphorus Flame Retardants

Advantages: High efficiency, low dosage requirements, minimal smoke generation, low toxicity.

Special Properties: Particularly effective for oxygen-containing polymers; shows synergistic effects when combined with metal hydroxide retardants.

Safety Enhancement: Microencapsulation technology prevents moisture absorption, discoloration, and explosion risks while maintaining dispersion capabilities.

Recommended Products:

CatalogNamePrice
ACMA00023457Red phosphorus pasteInquiry
ACMA00050982Red phosphorus flame retardant masterbatch for nylonInquiry
ACMA00051040Red phosphorus flame retardant masterbatchInquiry
ACMA00023452Red Phosphorus Flame Retardant Master Batch, FRP-950Inquiry
ACMA00023453Red Phosphorus Flame Retardant Master Batch, FRP-850Inquiry
ACMA00023454Red Phosphorus Flame Retardant Master Batch, FRP-750Inquiry
ACMA00023456Red Phosphorus Flame Retardant Master Batch, FRP-501Inquiry
ACMA00023455Red Phosphorus Flame Retardant Master Batch, FRP-301Inquiry
ACMA00051001PET red phosphorus flame retardant masterbatchInquiry
ACMA00050971New red phosphorus flame retardant masterbatch-750AInquiry

Boron Compounds & Borates

Zinc borate, sodium borate (as applicable) — multifunctional: act as flame retardants, smoke suppressants, and synergists for anti-drip and char stabilization; often used at lower additions than hydrates.

Recommended Products:

CatalogNamePrice
ACM10043353-4Boric Acid Technical GradeInquiry
ACM10043353-5Boric Acid Ph GradeInquiry
ACM12046047-1Ammonium PentaborateInquiry
ACM12280034Disodium octaborate tetrahydrateInquiry
ACM138265880-2Zinc Borate, Top GradeInquiry
ACM138265880-3Zinc Borate, Regular GradeInquiry
ACM13826885Zinc fluoroborateInquiry
ACM98536584Sodium metaborateInquiry
ACMA00023564Ammonium metaborateInquiry

Other Inorganic Flame Retardants

  • Antimony Compounds: Antimony trioxide (Sb2O3) — remains a key synergist in certain halogen-containing systems; used sparingly alongside halogenated retardants.
  • Layered Silicates & Nano-fillers: Organically-modified clays (MMT), layered silicates — improve char integrity, reduce free-draining molten polymer and can enhance barrier properties when well dispersed.
  • Synergistic Combinations: ATH/expanded graphite, ATH/organically modified montmorillonite, ATH/zinc borate systems, to achieve target UL/IEC classifications at lower total loadings.

Recommended Products:

CatalogNamePrice
ACM1309644-22Antimony Trioxide, 0.25-0.40 μmInquiry
ACM1309644-23Antimony Trioxide, 1.00-1.80 μmInquiry
ACM1309644-20Antimony trioxide, Sb2O3, 2.0-5.0 μmInquiry
ACM1309644-32Antimony Trioxide, 4.0-7.0 μmInquiry
ACM1309644-28Antimony Trioxide, 7.0-9.0 μmInquiry
ACMA00050989Antimony Trioxide MasterbatchInquiry
ACM1309644-14High Tint Antimony TrioxideInquiry
ACM1309644-15Low Tint Antimony TrioxideInquiry
ACM1332587-19Kaolin, powderInquiry
ACMA00023497Nano-montmorilloniteInquiry
ACMA00023565Nano Organic Montmorillonite(OMMT)Inquiry
ACMA00023499Organic composite porous layer inorganic salt (montmorillonite)Inquiry

How to Choose the Right Inorganic Flame Retardant?

01

Begin with polymer and processing conditions

Processing temp.: ATH has a lower decomposition temp. than MDH; if melt-processing temp. is higher, consider using MDH instead.

Polymer chem.: Some polymers (PVC) contain chlorine intrinsically and can synergize with select additives. Polyolefins may need higher metal hydrate loadings in general.

02

Think about end-use performance targets

Fire classification needed (UL 94 V 0, V 1 or V 2; IEC/EN class): this may point to preference for condensed-phase (char-forming) or endothermic-decomposition approach.

Smoke, toxicity limits: If low smoke/toxic gas emission is crucial (transport, enclosed areas), focus on halogen-free inorganic systems and smoke suppressants like zinc borate.

03

Acknowledge mechanical & aesthetic limitations

Impact, elongation: High-levels of mineral hydrates may compromise toughness; surface-treated grades or synergists can help lower needed loading.

Color, transparency: Some inorganics fillers have opacifying effects, tint the product white—nano grade or coated versions may be more suitable for clear/tinted articles.

04

Factor in regulatory & environmental concerns

Check against regional regulatory lists (RoHS, REACH, local fire codes) and ask for certified, compliant grades only. Alfa Chemistry has available documentation on request.

05

Consider cost and supply chain aspects

Trade-off performance vs. loading/scale-up and downstream processing costs. Pre-blended synergist systems may offer cost-effective compliance with lower total additive content.

Application-Specific Recommendations

Table: Inorganic Flame Retardant Selection Based on Application Requirements

Application AreaRecommended ProductsTypical Loading LevelsKey Benefits
Wire & CableATH, MDH, Nanocomposites40-60%Halogen-free, smoke suppression, electrical properties
Construction MaterialsATH, MDH, Red Phosphorus50-60%Non-toxic, persistent protection, cost-effective
Automotive ComponentsSurface-treated ATH/MDH40-50%Thermal stability, smoke reduction, material integrity
Electronics & ElectricalSynergistic ATH/MDH blends40-50%Halogen-free, high CTI (550-600V), thermal management
Food PackagingHigh-purity ATH50%Non-toxic, regulatory compliance, transparency control

Our flame-retardant experts are ready to help you make the best choice.

Contact Us

Our Solutions: Beyond Products to Partnership

At Alfa Chemistry, we understand that achieving optimal flame retardancy is a complex challenge that often requires more than off-the-shelf products. We partner with our clients to deliver tailored solutions that address specific material, processing, and regulatory needs.

Custom Flame Retardant Development

Performance Testing & Standards

Custom Flame Retardant Development

  • Microencapsulation Technology: We apply a durable polymeric coating to the surface of flame retardant particles. This technology is crucial for sensitive materials like red phosphorus and for enhancing compatibility.
  • Nanotechnology Integration: We develop and supply nanoscale inorganic flame retardants, such as nano-clays, layered double hydroxides (LDH), and nano-sized metal oxides.
  • Synergistic Compounding Technology: We design and optimize multi-component flame retardant systems where the combined effect is greater than the sum of the individual parts.

Flame Retardant Custom Development Service

Performance Testing & Standards

Flame Retardant Performance Analysis

  • Toxicity & Environmental Analysis
    a) Gas Emission Analysis: Identify and quantify toxic and corrosive gases (e.g., CO, CO2, HCN, NOx, HCl) released during combustion using FTIR and other analytical techniques.
    b) Environmental & Regulatory Screening: Ensure your products comply with RoHS, REACH (SVHC), Halogen-free, and other global standards.

Toxicity Analysis of Flame Retardant Materials

Successful Case Sharing with Inorganic Flame Retardants

Case Study 1: Advanced Cable Sheathing Formulation

Challenge:

Develop halogen-free flame retardant compound for high-voltage power cables requiring UL94 V-0 rating, minimal smoke generation, and maintained flexibility.

Solution: Alfa Chemistry provided a synergistic magnesium hydroxide/aluminum hydroxide blend with specialized surface treatment at 35% total loading.

Results: Achieved V-0 rating at 3.0mm thickness, 40% reduction in smoke density compared to previous halogenated system, maintained mechanical properties, and passed GWIT 775°C/GWFI 850°C requirements.

Case Study 2: High-Temperature Engineering Plastics with Synergistic Halogen-Free System

Challenge: A producer of electrical connectors using glass-filled PBT (polybutylene terephthalate) needed a halogen-free solution to achieve a V-0 rating. The high processing temperatures of PBT (~250°C) ruled out standard metal hydroxides like ATH due to their low dehydration temperature.

Solution: We developed a tailored solution using sodium antimonate as a synergist in combination with a phosphorus-based system. This system promoted the formation of a protective, continuous char layer without compromising the polymer's inherent properties.

Results: Consistently achieved UL-94 V-0 rating at 0.8mm. The formulation was fully stable at PBT processing temperatures, with no blistering or gas generation.

Case Study 3: Microencapsulated Red Phosphorus for Efficient Flame Retardancy in Nylon 6

Challenge: A manufacturer of industrial components from Nylon 6 required a highly efficient flame retardant to achieve a V-0 rating with minimal impact on mechanical properties and processability.

Solution: Our microencapsulated red phosphorus was the ideal candidate. The microencapsulation process eliminates the handling hazards and reactivity traditionally associated with red phosphorus. Its high efficiency allows for very low loading levels (typically 5-10%), minimizing the plasticizing effect and thus preserving the polymer's key mechanical properties. It is exceptionally effective in oxygen-containing polymers like nylons.

Results: Achieved UL-94 V-0 rating at 1.6mm with only 8% loading. Near-complete retention of impact strength and elongation at break compared to the unfilled, non-flame-retardant Nylon 6.

Why Alfa Chemistry?

Comprehensive Product Portfolio

We offer one of the most extensive ranges of inorganic flame retardants on the market, including specialized ATH and MDH grades, antimony-based synergists, boron compounds, and so on.

Deep Technical Expertise & Innovation

Our strength lies in advanced engineering capabilities like microencapsulation, nanotechnology, and synergistic compounding.

End-to-End Customer Partnership

We go beyond supplying chemicals by offering custom development services and extensive flame retardancy testing, acting as a technical partner to help our clients from formulation to final product certification.

Uncompromising Quality & Regulatory Support

We ensure our products meet high standards of consistency and purity, and provide comprehensive data to support compliance with major international environmental and safety regulations.

What Our Clients Say

" Alfa Chemistry's aluminum hydroxide flame retardants have transformed the way we produce PVC cables. We used to struggle to reach V-0 ratings without compromising mechanical properties and processability. Now, with the fine and consistent particle size of Alfa's ATH, we not only meet the standards but exceed them. "

Ms. Elena Petrova,

Production Manager

"As a compounder, consistency is everything. We have been using Alfa Chemistry's antimony trioxide as a key synergist for years across multiple product lines. The particle size distribution is consistently tight, which translates to predictable performance and trouble-free processing in our PVC and other halogenated systems. Alfa Chemistry is a supplier we can count on for unwavering quality and reliable supply chain support."

Mr. David Müller,

Procurement & Quality Manager

" We are developing a new bracket for automotive under-hood applications, but the engineering requirements require the material to withstand sustained high temperatures and meet the flame retardancy and smoke emission levels required by automotive safety standards. We selected Alfa Chemistry's MDH flame retardant. Its fine particle size and high surface area enabled us to achieve better-than-expected dispersion in the compound and enable us to achieve a UL94 V-0 rating without sacrificing the mechanical properties necessary to meet the design criteria."

Mr. Kenji Tanaka,

Senior Materials Engineer

FAQs About Inorganic Flame Retardants

Q: How do inorganic retardants differ from halogenated ones?

A: Inorganics are typically halogen-free, produce less toxic halogenated smoke, and often work by cooling (water release) or char formation rather than radical quenching in the gas phase.

Q: Are inorganic flame retardants permanent?

A: Yes — they are non-volatile solids that remain in the polymer matrix; however, migration can occur in poorly compounded systems unless treated or encapsulated.

Q: How do I choose between ATH and MDH?

A: Choose ATH for lower processing temperatures and cost-sensitive applications; choose MDH when higher decomposition temperature and thermal stability are required.

Q: When should I use zinc borate or APP?

A: Zinc borate is a synergist for smoke suppression and char stabilization; APP is used for intumescent/condensed-phase char systems, especially in coatings and thermoplastics.

Q: How much flame retardant do I need?

A: Required loading depends on target fire standard and polymer – metal hydroxides often need higher loadings (30–60 wt% in polyolefins) but synergists and intumescent systems can reduce total additive content.

Q: Can I reduce the loss of mechanical properties at high filler loadings?

A: Yes — use surface-treated grades, fine/nano dispersions, impact modifiers or pre-dispersed masterbatches to improve dispersion and interfacial bonding.

Q: Do inorganic flame retardants impact melt rheology?

A: Yes — high loadings increase viscosity and affect processing; particle size and surface treatment strongly affect rheology.

Q: How should I add inorganic flame retardants during compounding?

A: Masterbatches or pre-dispersed concentrates provide the most uniform feed to compounder; high-shear compounding is necessary for good dispersion, and usually more dust control.

Q: Why does my compounded product continue to drip or flame?

A: Possible reasons: insufficient loading, poor dispersion, wrong retardant chemistry for polymer, no synergists/intumescent components present.

Q: My product lost impact strength after adding ATH – what can I do?

A: Use surface-treated ATH, smaller particle sizes, impact modifiers or reduce loading via synergist blends.

Related Resources

Check out our latest updates on inorganic flame retardants, from selection guides, technical insights, and cutting-edge research.

Research Inventory of the Synergistic Flame Retardant Effect of Zinc Borate

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Applications of Magnesium Oxide as Additive in Flame Retardant Composites

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The Flame Retardant and Synergistic Effects of Antimony Trioxide for Materials

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Aluminum Hydroxide Systems: From Synergistic to Nano Flame Retardant

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Mechanism, Synthesis and Application of Magnesium Carbonate Flame Retardant

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Synergistic Flame Retardancy and Innovative Modification of Kaolin

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Inventory of Synergistic Flame Retardant Systems for Expandable Graphite

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