Inorganic Flame Retardant ATH

The latest compliant inorganic flame retardant ATH in 2026, with advantages such as high purity and narrow particle size, has become the core product of the inorganic halogen-free flame retardant market. The product has the value of efficient flame retardancy and smoke suppression, wide substrate compatibility, strong processing adaptability, and low cost, and is widely applicable to core tracks such as wires and cables, rubber and plastic products, building materials, coatings, and new energy auxiliary materials.

Core strengths

1. Precise heat absorption and temperature control: The initial decomposition temperature is 225 ℃ (peak decomposition temperature is 285 ℃), which perfectly matches the process range of medium and low temperature processing substrates such as EVA, PVC, epoxy resin, acrylic resin, etc. The unit mass heat absorption is as high as 1970J/g, and the combustion heat is quickly absorbed during the decomposition process, avoiding substrate yellowing and foaming defects caused by premature decomposition during processing;

2. Gas phase dilution and smoke suppression: The large amount of water vapor generated by decomposition can effectively dilute the concentration of combustible gases, reduce flame propagation speed, and capture free carbon particles produced by combustion. The smoke density ratio (SDR) is ≤ 68, and the smoke toxicity reaches GB/T 20284-2006 ZA1 level, far superior to the smoke toxicity performance of halogen flame retardants;

3. Dense protection of condensed phase: The decomposed α-Al₂O₃ micro powder can form a continuous and dense inorganic ceramic protective layer on the surface of the substrate, blocking the transfer of oxygen and heat, completely eliminating the risk of secondary fire caused by droplets, and the flame retardant performance is long-lasting and stable, not affected by ultraviolet rays and humid and hot environments.

4. Stable performance: In the EVA system with a high filling content of 50%, the tensile strength can reach 16.8MPa, the elongation at break is ≥ 380%, and the mechanical property retention rate is ≥ 92%, which is more than 30% higher than unmodified products, solving the problems of substrate brittleness and cracking caused by high filling;

5. Excellent processing flowability: The oil absorption value is as low as 15mL/100g, which is 25% lower than conventional inorganic flame retardant ATH. It can significantly improve the melt flow rate (MFR) of composite materials by more than 45%, reduce equipment torque and energy consumption during extrusion, injection molding, and coating processes, reduce mold wear, and adapt to high-speed automated production lines (screw speed ≤ 800rpm);

Application field

1. In the field of wires and cables

-Low smoke halogen-free cable material: used for insulation layer and sheath material of building wiring, rail transit cables, and new energy vehicle wiring harnesses, with an added amount of 40% -55%, meeting the GB/T 19666-2023 low smoke halogen-free standard, vertical combustion reaching FV-0 level, smoke density level ≤ 68, no toxic gas release during combustion, ensuring personnel escape and equipment safety;

-Mining rubber sheathed cable: used for flame retardant modification of underground mining cables, with an addition amount of 45% -50%. The flame retardant performance meets the MT 818-2019 standard, while improving the wear resistance and aging resistance of the cable. The service life is extended by more than twice in humid and dusty underground environments.

2. Rubber and plastic products field

-Soft rubber and plastic products: used for EVA foam shoe materials, PVC soft film, TPE automotive sealing strips and other products. Adding 30% -40% can achieve UL94 V0 level flame retardancy, while retaining the softness and elasticity of the product. The elongation at break is ≥ 350%, without any appearance, suitable for shoe materials, toys, automotive interiors and other scenarios;

-Hard rubber products: used for PP pipes, PE sheets, ABS home appliance shells and other products, with an addition amount of 40% -50%. The flame retardant grade reaches UL94 V0 level, and the mechanical property retention rate is ≥ 90%. It can replace some expensive flame retardants, reduce formula costs, and comply with safety standards in the home appliance and building materials industries.

3. Building materials field

-Fireproof coating: used for steel structure fireproof coating and decorative fireproof coating, with an addition amount of 35% -45%, can improve the flame retardant durability and fire resistance time of the coating. When the coating thickness is 15mm, the fire resistance time is ≥ 2.5h, and the formed carbon layer is dense and hard, effectively protecting the steel structure from high temperature damage;

-Flame retardant board: used for glass magnesium board, calcium silicate board, flame retardant density board, with an added amount of 30% -40%. The flame retardant grade reaches GB 8624-2012 B1 level, while improving the moisture resistance and bending strength of the board (≥12MPa), suitable for public places such as high-rise buildings, shopping malls, hospitals, etc;

-Modification of insulation materials: used for EPS and XPS insulation boards, with an addition of 25% -35%, achieving a flame retardant level of B1 and a thermal conductivity coefficient of ≤ 0.038W/( m·K). It has both flame retardant and insulation properties and is widely used in building exterior wall insulation systems.

4. Coating field

-Environmentally friendly flame retardant coating: used for water-based industrial coatings and fire-resistant latex paints. The hydrophilic modified ATH has good dispersibility, with an addition amount of 30% -40%. The flame retardant rating of the coating reaches Class A, with excellent weather resistance, no heavy metal pollution, and meets green building standards;

Frequently Asked Questions (FAQ)

Q1: What is the difference between inorganic flame retardants ATH and halogenated flame retardants?

A: Difference: ① Environmental friendliness: ATH is halogen-free and phosphate free, in line with global halogen-free policies; The combustion of halogenated flame retardants releases toxic hydrogen halide gases, which have been restricted for use in most countries; ② Smoke toxicity performance: ATH smoke density ratio ≤ 68, smoke toxicity reaches a safe level; Halogen flame retardants have a high smoke volume and toxicity, which can easily cause suffocation of personnel; ③ Stability: ATH flame retardant performance is not affected by ultraviolet radiation, humidity and heat, and is stable for a long time; Halogen based flame retardants are prone to precipitation, leading to a decline in the flame retardant performance of the product; ④ Cost: ATH has low raw material costs and a comprehensive usage cost that is more than 30% lower than halogenated flame retardants.

Q2: How to determine the amount of inorganic flame retardant ATH added to different substrates?  

A2: Conventional reference: ① EVA cable material: 40% -55%; ② PP Home Appliance Shell: 40% -50%; ③ Water based fireproof coating: 35% -45%; ④ Fiberglass composite material: 30% -35%.

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