Phosphorous Acid

Basic Information of Phosphorous Acid

CAS No.:	13598-36-2
EC No.:	237-066-7
Linear Formula:	H₃O₃P
Molecular Weight:	82.00
Appearance:	Clear, colorless aqueous solution.
Odor:	A strong reducing agent, readily oxidized to phosphoric acid.
Melting Point:	73 °C
Boiling Point:	Decomposes around 200 °C
Density:	1.651 g/mL at 25 °C(lit.)
Solubility:	Highly soluble in water, ethanol, and acetone.
Flash Point:	200°C
Acidity:	Diprotic acid (only two hydrogen atoms are acidic).
RIDADR:	UN 2834 8/PG 3
Chemical Structure:

Our commitment to delivering high-purity Phosphorous Acid ensures a reliable and efficient component for your critical processes, offering consistent quality for diverse industrial needs.

Primary Applications of Phosphorous Acid

Phosphorous Acid's strong reducing capabilities, chelating properties, and versatile reactivity make it a fundamental chemical with extensive applications across various industries:

1. Production of Phosphite Salts:

   The primary use of Phosphorous Acid is in the manufacturing of various phosphite salts (e.g., sodium phosphite, potassium phosphite, calcium phosphite). These phosphites are widely used as stabilizers for plastics (PVC), flame retardants, and in agricultural applications.

2. Water Treatment Chemicals:

   It is used in the synthesis of water treatment chemicals, particularly phosphonates, which act as scale inhibitors, corrosion inhibitors, and dispersants in industrial water systems and cooling towers, preventing mineral buildup.

3. Reducing Agent:

   As a powerful reducing agent, it is employed in various chemical processes to reduce other compounds. For example, it can reduce noble metal salts to their elemental forms.

4. Agriculture & Plant Health:

   Phosphorous acid and its phosphite derivatives are used in agriculture as fungicides and plant defense activators. They enhance plants' natural resistance to various fungal and oomycete diseases, such as downy mildew and Phytophthora. They also act as a source of phosphorus nutrition.

5. Organic Synthesis Intermediate:

   It serves as a key intermediate in organic synthesis for the production of various phosphorus-containing organic compounds, including pharmaceuticals, agrochemicals, and specialty chemicals.

6. Chelating Agent:

   Its ability to form stable complexes with metal ions makes it useful as a chelating agent in certain industrial applications.

• Exceptional Purity & Consistent Quality: Our Phosphorous Acid is manufactured to stringent purity specifications, crucial for ensuring optimal performance in sensitive applications like agricultural formulations, plastic stabilization, and fine chemical synthesis.

• Commitment to Quality & Safety: We adhere to the highest industry standards for quality management, safety, and environmental responsibility across all our operations, ensuring peace of mind for our clients.

Hazards Classification

• GHS Classification: Corrosive (GHS05), Acute Toxicity (GHS06)

• Hazard Statements: Causes severe skin burns and eye damage; harmful if swallowed or inhaled.

• UN Number: UN 2834

• Hazard Class: 8 (Corrosive Substances)

• Packing Group: III