China Phosphorous Acid Price - Wholesale Cheap Phosphorous Acid Made in China

Your Professional Phosphorous Acid Supplier！

Nantong Shengfeng Chemical Co., Ltd. is located in Fengli Town, Nantong City, bordering the Yangtze River to the south and the Yellow Sea to the east. Situated within Shanghai's one-hour economic circle, it enjoys convenient land and water transportation, giving it a significant geographical advantage. The company specializes in producing a series of phosphonates, including phosphonic acid, potassium dihydrogen phosphate, and potassium phosphonate.

Solid Phosphorous Acid
Solid phosphorous acid is a widely used inorganic compound with the chemical formula H₃PO₃, a molecular weight of 82.00 and a CAS registry number of 13598-36-2.
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Acid Phosphoric Acid
acid phosphoric acid is an inorganic compound with the chemical formula H₃PO₃, a molecular weight of 82.00, and a CAS registry number of 13598-36-2. It appears as colorless to pale yellow crystalline flakes with a garlic-like odor, and is
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Hyper Phosphoric Acid
Hyper phosphoric acid is a widely used inorganic compound with the chemical formula H₃PO₃, a molecular weight of 82.00 and a CAS registry number of 13598-36-2.
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Phosphorous Acid Solution
Phosphorous acid solution is a crucial basic raw material in chemical production, with its fundamental information and physicochemical parameters presented in the table below
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Why Choose Us

Rich Experience

We have accumulated 16 years of mature, All products strictly adhere to national standards, ensuring stable and reliable quality.

Sales Market

Our products are exported to South America, North America, Australia, and most parts of Europe, winning unanimous praise from customers both domestically and internationally.

Production Equipment

The production equipment is fully equipped, including 20 reaction kettles, 4 centrifuges, a thermal oil circulating boiler, and a small packaging filling line, which can fully meet the needs of large-scale production and standardized packaging of a series of phosphonate products.

Our Service

We have a professional service team that can provide clients with end-to-end problem solutions. We also support customized formulations with different content specifications and packaging methods based on clients' usage habits and individual needs, maximizing the satisfaction of diverse client requirements.

Overview of Phosphorous Acid

Phosphoric acid (H3PO4) is a colorless, odorless inorganic mineral acid, commonly used as an 85% aqueous solution. It is widely used in fertilizers, food flavoring (especially in cola), and rust removal. While it is a weak acid, it is highly corrosive to metals and skin in high concentrations.

Product Specification

We offers the following product specifications：

Composition	H3PO3
CAS	13598-36-2
Melting Point	73 C
Density	1.65 g/ml
Molecular Weight	Mol. wt. = 82.0
Boiling Point	200 C (dec)

Product Advantages

Waste Minimization: Continuous-flow reactors in phosphite ester synthesis recycle unreacted acid, reducing disposal needs.

Safer Alternatives: Biodegradable phosphites replace halogenated flame retardants, minimizing environmental persistence.

Energy Efficiency: Low-temperature microreactors (e.g., 40°C) cut energy use in pharmaceutical synthesis.

Catalysis: Non-toxic catalysts (e.g., silica-based) improve yields in fungicide production, reducing excess acid.

Real-Time Monitoring: Sensors track phosphite levels in water treatment, optimizing dosing (<10 ppm).

Application

Metal Treatment & Rust Conversion

Converts iron oxide to protective ferric phosphate coating. Industry standard for automotive restoration and structural steel preparation.

Fertilizer Production

Backbone of global agriculture. Used to produce MAP and DAP fertilizers providing essential phosphorus for plant growth and root development.

Water Treatment

Adjusts pH and inhibits corrosion in municipal and industrial water systems. Prevents scale buildup in boilers and cooling towers.

Laboratory & Research

ACS-grade purity for analytical chemistry, reagent preparation, and high-precision applications in research and quality control.

Electronics Fabrication

Used for etching and cleaning semiconductor wafers, PCBs, and LCD panels. ACS purity prevents trace metal contamination.

Concrete & Masonry

Etches concrete surfaces for sealant adhesion. Removes efflorescence and mineral deposits from masonry structures.

Precautions

Personal Protective Equipment: Always wear chemical-resistant gloves (nitrile or neoprene), splash-proof safety goggles, and a face shield when handling concentrated solutions. A chemical-resistant apron is recommended for bulk transfers.

Ventilation: While phosphoric acid is non-volatile at room temperature, heating or vigorous agitation can produce irritating mists. Use in a well-ventilated area or under local exhaust ventilation. Respiratory protection (acid gas cartridge) is recommended when heating above 100 °C.

Storage: Store in HDPE, polypropylene, or PTFE-lined containers in a cool, dry, well-ventilated area. Keep away from incompatible materials including strong bases (sodium hydroxide), active metals (zinc, magnesium), and oxidizing agents. Ensure containers are properly labeled and secondary containment is in place.

Spill Response: Contain the spill and neutralize with a weak base such as soda ash (sodium carbonate) or sodium bicarbonate. Apply gradually to avoid excessive foaming. Collect neutralized material and dispose of according to local regulations.

Package & Delivery

Regular Packaging: 25 kg per fiber drum (lined with plastic bag)
Customized Packaging: 1 kg, 5 kg, 25 kg and other specifications available according to customer requirements

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FAQ

Q: What is phosphorous acid and how is it commonly used?

A: Phosphorous acid (H₃PO₃) is a phosphorus-based compound primarily used as a reducing agent and as an intermediate in the production of phosphites. It is widely applied in agriculture (as a fungicide and fertilizer component), water treatment, and industrial chemical synthesis.

Q: What are the main industrial applications of phosphorous acid?

A: Key applications include the manufacture of metal phosphites (e.g., potassium phosphite), stabilizers for PVC, water treatment chemicals, and agrochemical formulations, particularly systemic fungicides.

Q: What purity levels are typically available?

A: Phosphorous acid is generally available in technical grade (≥98%) and higher purity grades depending on application requirements. Buyers should specify impurity limits, especially for heavy metals and chlorides.

Q: How is phosphorous acid different from phosphoric acid?

A: Although similar in name, phosphorous acid (H₃PO₃) is a reducing agent, while phosphoric acid (H₃PO₄) is not. Their chemical properties, reactivity, and applications differ significantly, making them non-interchangeable.

Q: What packaging options are available for bulk supply?

A: Common packaging includes 25 kg bags, 500–1000 kg jumbo bags, and customized packaging upon request. Liquid solutions may also be supplied in drums or IBC tanks.

Q: What are the recommended storage conditions?

A: Phosphorous acid should be stored in a cool, dry, and well-ventilated area, away from moisture and incompatible substances such as strong oxidizing agents. Proper sealing is essential to prevent degradation.

Q: Is phosphorous acid hazardous?

A: Yes, it is classified as a corrosive substance. It can cause skin and eye irritation and should be handled with appropriate personal protective equipment (PPE), including gloves and safety goggles.

Q: What certifications and compliance standards should suppliers meet?

A: Reputable suppliers typically comply with REACH, RoHS, and ISO standards. For agricultural use, compliance with local regulatory frameworks such as EPA (USA) or EFSA (EU) may be required.

Q: Can phosphorous acid be used in organic farming?

A: Generally, phosphorous acid and its salts are not approved for certified organic farming in most regions, as they are considered synthetic chemicals. Buyers should verify local regulations.

Q: What is the typical lead time for orders?

A: Lead times usually range from 2 to 4 weeks depending on order volume, packaging requirements, and supplier capacity. Stock availability may reduce delivery time.

Q: How stable is phosphorous acid during storage?

A: When stored properly, phosphorous acid is relatively stable. However, it may slowly oxidize to phosphoric acid over time, particularly if exposed to air and moisture.

Q: Can customization or OEM services be provided?

A: Yes, many manufacturers offer tailored solutions including specific concentrations, packaging, labeling, and documentation to meet OEM or private label requirements.

Q: What transportation considerations apply?

A: As a corrosive material, phosphorous acid is regulated under hazardous goods transport. It must be shipped in accordance with ADR, IMDG, or DOT regulations, depending on the region.

Q: What quality documentation should be provided with shipments?

A: Standard documentation includes Certificate of Analysis (COA), Safety Data Sheet (SDS), Technical Data Sheet (TDS), and, where applicable, compliance certificates.

Q: How do buyers ensure consistent product quality?

A: Buyers should work with certified suppliers, request batch-level testing data, conduct incoming quality inspections, and establish long-term supply agreements with defined specifications.

We're well-known as one of the most experienced phosphorous acid enterprises in China for 20 years. Please feel free to buy discount phosphorous acid made in China here and get free sample from our factory. For price consultation, contact us.

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