Calcium Hypophosphite (Calcium Hypophosphite, CAS:7789-79-9)

1. Basic Introduction

2. Physical & Chemical Properties

Physical Properties

1. Appearance: White monoclinic crystalline powder, odorless, slight bitter taste, high whiteness ≥96

2. Solubility: Soluble in water (16.7g/100g water at 25°C), slightly soluble in glycerol, completely insoluble in ethanol and organic solvents

3. Density: 1.634 g/cm³; aqueous solution weak acid, pH 5.0–7.0 (100g/L solution)

4. Thermal stability: Initial decomposition temperature ~300–350℃; purity standard ≥98.0% industrial grade

Chemical Properties

1. Strong reducing property: Hypophosphite anion carries reducing activity, far more stable than sodium hypophosphite under normal temperature, incompatible with strong oxidants

2. Thermal decomposition characteristic: When heated above 300℃, it decomposes to release flammable phosphine (\(PH_3\)) and calcium polyphosphate residues

3. Halogen-free structure: Contains no bromine/chlorine; no toxic dioxin or hydrogen halide released during combustion, compliant with RoHS & REACH regulations

4. High phosphorus content: Up to 32.6% phosphorus element, high flame-retardant efficiency per unit mass

3. Core Applications (Classified by Industry)

① Halogen-free Flame Retardant (Main Polymer Application)

• Mechanism: Dual-phase flame suppression

  1. Gas phase: Releases phosphorus free radicals to quench H·/OH· radicals and cut off combustion chain reaction;

  2. Condensed phase: Forms dense calcium phosphate char layer on plastic surface to isolate oxygen and heat transfer

• Applicable materials: PA6/PA66, PBT, PET, epoxy resin, rubber, cable plastic, engineering plastics for electronics

• Advantages: Low smoke, low toxicity, good compatibility with polymer matrix, can reach UL94 V-0 rating with low addition ratio

② Electroless Nickel Plating Additive (Key Industrial Usage)

1. Acts as primary reducing agent: Provides electrons to reduce nickel ions to uniform Ni-P alloy coating without external power supply

2. Bath stabilizer: Suppresses accumulation of phosphite byproducts, extends plating liquid service life, reduces precipitation

3. Coating performance: Produces hard, wear-resistant, anti-corrosion nickel-phosphorus layer for auto parts, electronic circuit boards, aerospace precision components

③ Animal Feed & Food Nutrition Supplement

• Dual nutrient supply of calcium and phosphorus, high bioavailability

• Added to livestock, poultry, aquaculture feed and cod liver oil supplements to strengthen bone development, improve growth rate and antioxidant capacity抖音百科

• Low heavy metal index (Pb<10ppm, As<0.4ppm), meets feed/food additive safety standards

④ Pharmaceutical & Chemical Reagent

1. Raw material for calcium-phosphorus oral supplements and dental repair biomaterials with good biocompatibility

2. Analytical reagent for arsenic quantitative testing (Gutzeit method) in lab chemical analysis

3. Intermediate to produce sodium/potassium hypophosphite, hypophosphorous acid and other hypophosphite products via double decomposition reaction

⑤ Other Auxiliary Industrial Uses

1. Water treatment corrosion inhibitor: Forms protective film on pipeline inner wall to reduce metal corrosion for boiler & cooling water system

2. Antioxidant additive for polymer processing to delay plastic aging

3. Metal surface cleaning agent for pre-treatment before electroplating

4. Storage & Safety Remarks

1. Sealed dry storage, avoid high temperature and mixing with oxidizing agents; prevent moisture caking

2. UN classification 3178; avoid open flame during high-temperature processing due to phosphine generation

3. Non-toxic solid, general industrial packaging: 25kg woven bag with inner PE liner

4. Product technical consultation: E-mail:Sales@hxochem.com Whatsapp: +8613330004268, WeChat: +8613285168509