Sodium Tripolyphosphate(STPP)--Tech.Grade &Food Grade

1. Health and Safety Precautions

• Skin Contact Protection

Sodium tripolyphosphate powder or aqueous solution is weakly alkaline. Prolonged or direct contact can damage the skin's lipid barrier, leading to dryness, peeling, and itching. Wear **nitrile rubber gloves** and long-sleeved protective clothing during handling to avoid exposed skin. Wash hands thoroughly with neutral hand sanitizer and apply hand cream after handling. If contact occurs, immediately flush the affected area with plenty of running water for 10-15 minutes. Seek medical attention immediately if redness, swelling, or stinging occurs.

• Eye Protection

Splashes of sodium tripolyphosphate powder or solution into the eyes can irritate the conjunctiva and cornea, causing redness, swelling, pain, and tearing. Wear **impact-resistant goggles** during handling. For high-risk operations such as feeding and mixing, a full-face mask is recommended. If eye contact occurs, immediately lift the eyelids and flush with plenty of water or saline solution for 15-20 minutes. Avoid rubbing the eyes during this time and seek medical attention as soon as possible.

• Respiratory Protection

Dry sodium tripolyphosphate powder is prone to dust generation. Inhalation can irritate the nasal mucosa, throat, and respiratory tract, causing discomfort such as dry throat, cough, and chest tightness. When operating in confined spaces, a **ventilation system or fume hood** must be turned on; when performing dusty operations such as feeding and screening, a **KN95 or higher level dust mask** must be worn. Avoid prolonged inhalation of dust without protection. If respiratory discomfort occurs during operation, immediately move to a place with fresh air to rest.

• Ingestion Protection

Industrial-grade sodium tripolyphosphate is strictly prohibited from consumption; food-grade sodium tripolyphosphate must be used strictly according to national standards and should not be ingested indiscriminately. Ingestion can irritate the digestive tract, causing symptoms such as nausea, vomiting, abdominal pain, and diarrhea. Eating, drinking, and smoking are strictly prohibited in the work area. Hands must be thoroughly washed after handling. Products must be stored separately, with industrial-grade and food-grade **strictly distinguished**. Packaging must be clearly labeled "Industrial Use" or "Food Additive". If ingestion occurs, immediately drink plenty of warm water to dilute it; do not induce vomiting, and bring the product label to seek medical attention. 

2. Storage and Transportation Safety Precautions

• Storage Requirements

- Store in a cool, dry, and well-ventilated warehouse, away from fire and heat sources. The warehouse temperature should be controlled below 35℃, and the relative humidity should not exceed 80%.

- Sodium tripolyphosphate is hygroscopic and prone to clumping. It must be stored in **sealed, moisture-proof packaging** (such as woven bags lined with polyethylene film). When stacking, elevate the bottom of the bag at least 10cm and maintain a distance of at least 20cm from the walls to prevent moisture absorption and deterioration.

- Do not store with strong acids, strong oxidizers, or hygroscopic chemicals such as hydrochloric acid, nitric acid, and potassium permanganate to avoid chemical reactions that could generate toxic gases or cause product failure.

- The storage area must be equipped with spill response equipment (brooms, dustpans, leak-proof mats) and fire extinguishers (dry powder fire extinguishers).

• Transportation Requirements

- Transport vehicles must be kept dry and clean. The cargo compartment should be lined with rainproof tarpaulins or plastic film. During transportation, cover the vehicle with a tarpaulin to prevent rain, sun exposure, and dust.

- Handle with care during loading and unloading to prevent packaging damage and powder leakage; industrial-grade and food-grade sodium tripolyphosphate should be transported **separately**, and must not be mixed with strong acids, strong alkalis, or other hazardous chemicals.

- Comply with transportation route regulations, avoiding densely populated areas such as residential areas and schools; transportation of food-grade products must meet the hygiene standards for food additive transportation.

3. Leakage Emergency Handling

• Small Leakage

Immediately collect the leaked material into a **sealed container** using a dry broom or shovel, label it "Waste STPP," and store it properly. Do not discard it indiscriminately; avoid flushing the leaked material into sewers to prevent water pollution.

• Large Leakage

Quickly establish a warning zone, prohibiting unauthorized personnel from entering; use impermeable mats or sand to contain the leak area to prevent spread; personnel handling the situation must wear full protective equipment (protective clothing, gloves, goggles, dust masks), and transfer the leaked material in batches to dedicated collection containers, entrusting a qualified unit to handle it.