Description

Ammonium Tungstate Pentahydrate (99.999%-W) Puratrem is a high-purity inorganic salt of tungsten, supplied as a white to off-white crystalline powder. This ultra-high purity grade (5N) is critical for applications where trace metal contamination can compromise performance or product integrity. It is an essential precursor material for research and manufacturing in advanced materials, electronics, and catalysis.

Application

• Precursor for the synthesis of high-purity tungsten metal, tungsten oxides (WO3), and tungsten carbide powders.
• Manufacturing of phosphors and luminescent materials for lighting and display technologies.
• Catalyst and catalyst support in petrochemical and fine chemical synthesis processes.
• Starting material for chemical vapor deposition (CVD) and atomic layer deposition (ALD) of tungsten-containing thin films in semiconductor fabrication.
• Analytical chemistry as a standard or reagent in spectroscopic and gravimetric analysis.
• Research and development in electrochemistry and energy storage devices.
• Additive in specialty glasses and ceramics to modify thermal and optical properties.

Basic Information

Product Name	Ammonium Tungstate Pentahydrate (99.999%-W) Puratrem
CAS No.	1311-93-9
Molecular Formula	(NH4)10W12O41 • 5H2O or commonly represented as (NH4)6H2W12O40 • xH2O
Molecular Weight	~3042.26 (Anhydrous basis)
Synonyms	Ammonium Paratungstate Pentahydrate; APT; Ammonium Paratungstate (APT); Diammonium Tetratungstate; Ammonium 12-Tungstophosphate; Puratrem Ammonium Tungstate; Ammonium Wolframate; Tungstic Acid, Ammonium Salt Pentahydrate
EINECS	215-223-0

Quality Control

Every batch of our Ammonium Tungstate Pentahydrate (99.999%-W) Puratrem is manufactured and tested to meet exacting standards for ultra-high purity materials. Quality assurance includes verification of tungsten content, analysis of trace metallic impurities by ICP-MS/OES, and confirmation of physical and chemical identity. A comprehensive Certificate of Analysis (COA) detailing lot-specific results is provided with each shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and must be kept in a dry environment to prevent caking or decomposition. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to standard
Assay (as WO3)	≥ 89.0 %
Purity (Tungsten Metal Basis)	99.999% (5N) min
Solubility (in Water)	Clear, colorless solution
Trace Metals Analysis (ICP-MS)	< 10 ppm total (Al, Ca, Co, Cr, Cu, Fe, K, Mg, Mo, Na, Ni, Si, etc.)
Chloride (Cl)	< 10 ppm
Sulfate (SO4)	< 20 ppm
Ammonium (NH4)	By calculation, conforms
Loss on Drying	Contact for details

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