Description

Trimetaphosphoric Acid is a high-purity inorganic acid, a cyclic trimer of phosphoric acid, with the CAS registry number 13566-25-1. This compound serves as a versatile and reactive intermediate for the synthesis of specialty phosphates and as a catalyst in organic synthesis. It is essential for manufacturers and R&D laboratories in the chemical, pharmaceutical, and agrochemical industries seeking precise phosphate chemistry.

Application

• Chemical Synthesis Intermediate: A key precursor for the production of high-value sodium, potassium, and ammonium trimetaphosphates and other complex phosphate salts.
• Catalyst: Used as an acid catalyst in various organic reactions, including esterification and condensation processes.
• Water Treatment: Acts as a sequestering agent and scale inhibitor in industrial water treatment formulations.
• Laboratory Reagent: Employed in analytical chemistry and research as a standard or reagent for phosphate-related studies.
• Food Industry: Potential use as a sequestrant, texturizer, or processing aid in food-grade phosphate production (subject to regulatory approval and specific grade).
• Detergent & Cleaning Agents: A building block for phosphate-based components in industrial cleaning and detergent formulations.
• Ceramics & Glass: Used as a fluxing agent or additive to modify the properties of ceramic glazes and glass batches.
• Metal Surface Treatment: Component in formulations for metal cleaning, phosphating, and corrosion inhibition.

Basic Information

Product Name	Trimetaphosphoric Acid
CAS No.	13566-25-1
Molecular Formula	H3P3O9
Molecular Weight	257.95 g/mol
Synonyms	Cyclotriphosphoric Acid; Metaphosphoric Acid (cyclic trimer); 1,3,5-Trioxo-2,4,6-trioxa-1,3,5-triphosphasilinane; Triphosphoric Acid, cyclic; Phosphoric Acid, cyclic trimer; Trimetaphosphate (acid form); H3P3O9; Cyclic triphosphoric acid
EINECS	236-960-5

Quality Control

Our Trimetaphosphoric Acid is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets high-purity standards suitable for industrial and laboratory applications. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment to guarantee traceability and consistency.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and must be kept in a dry environment to prevent absorption of atmospheric moisture, which can lead to caking or hydrolysis. Keep away from incompatible materials such as strong bases and reactive metals.

Specification

Item	Specification
Appearance	White crystalline powder or lumps
Identification (IR)	Conforms
Assay (as H3P3O9)	≥ 98.0 %
Water (Karl Fischer)	≤ 2.0 %
Chloride (Cl)	≤ 0.01 %
Sulfate (SO4)	≤ 0.02 %
Heavy Metals (as Pb)	≤ 10 ppm
Iron (Fe)	≤ 20 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.