Product Name: Sodium Hexametaphosphate Food Grade
Synonyms: SHMP, Graham’s salt, Hexaphos
Chemical Formula: (NaPO3)6
CAS Number: 10124-56-8
Recommended Use: Food additive, water softener, sequestrant
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GHS Classification: Eye irritation (Category 2A), Skin irritation (Category 3)
Signal Word: Warning
Hazard Statements: Causes serious eye irritation, may cause skin irritation, dust can cause respiratory tract irritation
Pictograms: Exclamation mark
Precautionary Statements: Wash hands thoroughly after handling. Wear protective gloves and eye protection. Avoid breathing dust. If in eyes: Rinse cautiously with water for several minutes.
Substance: Sodium Hexametaphosphate
Purity/Concentration: ≥ 98% by weight
CAS Number: 10124-56-8
Impurities: Trace amounts of sodium orthophosphate and sodium pyrophosphate may be present
Eye Contact: Rinse with plenty of water for at least 15 minutes, remove contact lenses if present, continue rinsing, seek medical help if irritation persists
Skin Contact: Wash skin thoroughly with soap and water, remove contaminated clothing, seek medical advice if irritation continues
Inhalation: Move to fresh air, keep at rest, seek medical attention if symptoms like coughing or breathing difficulty develop
Ingestion: Rinse mouth, do not induce vomiting, seek medical care if feeling unwell or if large amount ingested
Suitable Extinguishing Media: Water spray, dry chemical, foam, or carbon dioxide
Unsuitable Media: None known
Hazardous Combustion Products: Sodium oxide, phosphorous oxides
Special Protective Equipment: Firefighters should put on self-contained breathing apparatus and full protective gear
Fire Hazards: Product does not burn under normal conditions, packaging may burn and produce irritating fumes
Personal Precautions: Avoid dust formation, ventilate the area, wear protective clothing, gloves, and goggles
Environmental Precautions: Prevent from entering drains, sewers, and watercourses
Spill Response: Sweep or vacuum up spillage, avoid generating dust, place material in suitable container for disposal, wash spill area with water
Precautions for Safe Handling: Handle in well-ventilated space, avoid contact with skin, eyes, and clothing, prevent dust accumulation, do not eat, drink, or smoke during use
Storage Conditions: Keep containers tightly closed in dry, cool, and well-ventilated place, store away from acidic materials and moisture
Incompatible Materials: Strong acids, magnesium, aluminum, and other reactive metals
Occupational Exposure Limits: No specific limits set by OSHA, ACGIH, or NIOSH; treat as nuisance dust (10 mg/m³ total dust, 5 mg/m³ respirable fraction)
Engineering Controls: Use local exhaust ventilation to minimize dust, maintain eyewash stations and safety showers nearby
Personal Protective Equipment: Safety glasses with side shields or goggles, chemical-resistant gloves (PVC or nitrile), dust-proof clothing, dust mask or NIOSH-approved respirator if dust levels exceed exposure guidelines
Appearance: White, odorless powder or granular
Odor: None
pH (1% solution): 5.8–7.3
Melting Point: > 600°C (decomposes)
Boiling Point: Not applicable
Density: 2.484 g/cm³
Solubility in Water: Easily dissolves
Vapor Pressure: Not relevant for solid
Flash Point: Not flammable
Partition Coefficient (n-octanol/water): Not determined
Chemical Stability: Stable under normal handling and storage conditions
Reactivity: Reacts with strong acids to form phosphoric acid and sodium salts
Hazardous Reactions: Contact with magnesium, aluminum, and other reactive metals generates hydrogen gas
Conditions to Avoid: Moisture, high humidity, exposure to acids
Decomposition Products: Sodium oxide, phosphorus oxides
Acute Toxicity: Oral LD50 (rat): > 3053 mg/kg
Short-Term Exposure: May cause eye, skin, and respiratory tract irritation
Chronic Effects: No reliable evidence of carcinogenicity, mutagenicity, or reproductive toxicity
Routes of Exposure: Inhalation, ingestion, contact with skin or eyes
Symptoms: Redness, tearing, coughing, sore throat, upset stomach if ingested
Aquatic Toxicity: Harmful to aquatic life in high concentrations
Persistence and Degradability: Inorganic substance, not readily degradable
Bioaccumulation Potential: Low
Mobility in Soil: Readily mobile due to high water solubility
Other Effects: Elevated phosphate levels can promote algae growth and disturb aquatic balance if released in large amounts
Disposal Methods: Collect in appropriate containers for disposal in accordance with local, regional, and national regulations
Environmental Precautions: Do not dispose of product in the environment, avoid contamination of water sources
Unused Product: Dispose of through licensed professional waste disposal service
Contaminated Packaging: Dispose of as non-hazardous waste after thorough cleaning
UN Number: Not regulated as hazardous for transport
Proper Shipping Name: Sodium Hexametaphosphate
Transport Hazard Class: Not classified as dangerous good
Packing Group: Not applicable
Transportation Notes: Keep product dry, avoid heavy vibration and breakage of packaging during transport, check transportation regulations for region
OSHA Status: Not specifically listed as hazardous
SARA 313 Components: Not subject to reporting requirements
TSCA Inventory: Listed
EU Regulations: Listed in Annex IV of Regulation (EC) No 1907/2006 (REACH)
FDA Status: Approved for use as a food additive in accordance with 21 CFR 182.6760
Other Regulatory Info: Check regional, national, and local environmental and safety regulations for additional requirements
