Overview
Aluminum triphosphate (CAS 13939-25-8 ) is an inorganic aluminum salt used primarily as a corrosion-inhibiting pigment and pH buffer in protective coating systems. It functions by passivating metal substrates.
This chemical slows electrochemical corrosion without relying on heavy metals such as chromate or zinc phosphate. In anticorrosive primers and industrial coatings, it acts as a non-toxic corrosion inhibitor.
It is ideal for steel and aluminum substrates, replacing chromate-based alternatives in compliance-sensitive formulations. Adhesive and sealant manufacturers incorporate it to improve adhesion to metal surfaces.
The compound helps maintain pH stability in the cured system. In construction materials such as cementitious coatings and waterproofing membranes, it contributes to substrate protection and long-term durability.
Water treatment formulators use it as a buffering agent to control pH in treatment compounds and mineral-based process chemicals. It is supplied as a fine white powder suited for dispersion into liquid systems.
The material is compatible with adhesive bases and dry-blended construction formulations. Technical grade is the standard commercial specification, with particle size distribution being a key quality parameter.
Buyers sourcing for coatings applications should confirm compatibility specifications. Performance varies with surface area and purity level for pigment-grade material in industrial manufacturing environments.
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Physical Properties
| Density | 378.3[at 20℃] |
| Water Solubility | 340μg/L at 20℃ |
| Vapor Pressure | 0Pa at 20℃ |
Safety & Handling
Warning GHS07 Hazard Statements H315 Causes skin irritation H319 Causes serious eye irritation Precautionary Statements P264 Wash … thoroughly after handling. P280 Wear protective gloves/protective clothing/eye protection/face protection. P321 Specific treatment (see … on this label). P264+P265 Wash … thoroughly after handling. P302+P352 IF ON SKIN: Wash with plenty of water. P332+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Other Names
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Chemical Properties
- CAS Number
- 13939-25-8
- EC Number
- 237-714-9
- Mol. Weight
- 281.91
- Category
- Pigments & Colorants