High Purity Nano Aluminum Hydroxide CAS 21645-51-2 is low-impurity halogen-free inorganic flame retardant. It features fine nano particles, excellent dispersion in silicone rubber, outstanding flame retardancy and smoke suppression. It maintains rubber’s elasticity and insulation performance, widely used for silicone rubber modification.

Product Detail

High Purity Nano Aluminum Hydroxide CAS 21645-51-2 Flame Retardant for Silicone Rubber

Product Overview

High Purity Nano Aluminum Hydroxide (Nano ATH, CAS 21645-51-2) is a low-impurity halogen-free inorganic flame retardant manufactured via high-purification and nano ultrafine grinding technology. Upon thermal decomposition, it absorbs substantial heat and releases crystal water to suppress combustion. A dense alumina protective layer forms on the rubber surface to isolate oxygen and reduce smoke emission. Its nanoscale particle size enables homogeneous dispersion within silicone rubber matrix, minimizing deterioration of elasticity, tensile properties and electrical insulation. It is an ideal flame retardant filler for various silicone rubber products.

Core Features

High Purity & Low Impurities: Low heavy metal and soluble ion content, less influence on silicone curing system.
Halogen-free Flame Retardant & Smoke Suppression: No toxic halide gas released during combustion, meets low-smoke environmental requirements.
Nano Uniform Particles: Good dispersion, effectively avoids agglomeration and maintains smooth rubber surface.
Excellent Electrical Insulation: Stabilize dielectric performance, suitable for electrical-grade silicone rubber.
Good Compatibility with Silicone Matrix: Less adverse impact on rubber elasticity and compression resilience.
Optional Surface Modification: Modified grades further improve interfacial bonding with silicone rubber.

Product Specifications

Product Name: High Purity Nano Aluminum Hydroxide

CAS No: 21645-51-2

Chemical Formula: Al(OH)₃

Appearance: White fine powder

Processing Technology: Purification, nano pulverization, classification, optional surface treatment

Core Function: Halogen-free flame retardant, smoke suppressant, insulating filler

Applicable Materials: Solid silicone rubber, liquid silicone rubber, flame retardant silicone compounds

Application Scope

This high purity nano ATH is specially developed for silicone rubber systems. Widely used in flame retardant silicone wire and cable insulation, silicone sealing gaskets, electronic potting silicone, high-temperature silicone rollers, fire-resistant silicone sheets and electrical insulating silicone components. It can be used alone or compounded with silicone-specific flame retardant additives to achieve required flame retardant standards such as UL94 V-0.

Usage Guide

Mix uniformly with silicone raw rubber, reinforcing fillers and curing agents during kneading process. Control mixing time to guarantee full dispersion. Adjust loading amount according to target flame retardant grade and rubber hardness requirements. Conduct small batch test to verify curing performance before mass production. Store tightly sealed to prevent moisture absorption.

Packaging & Storage

Packaging: 25kg plastic-lined woven bag, customized packaging acceptable

Storage: Store in cool, dry and ventilated warehouse; keep tightly sealed against moisture

Shelf Life: 12 months under original sealed storage

Our Advantages

Our high purity nano aluminum hydroxide features low impurity index, narrow particle size distribution and stable batch consistency. Unmodified and surface-modified types are available to match different silicone formulas. Professional technical support for silicone rubber flame retardant formulation optimization. Factory direct supply ensures stable stock and fast delivery. Free samples can be provided for customer evaluation.

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