Calcium hydroxide 90–99.5%

I. Health and Safety Precautions

• Skin Contact Protection

Calcium hydroxide powder and suspension (lime milk) are alkaline and corrosive. Direct contact can damage the skin's lipid layer, causing dryness, peeling, and redness. Long-term contact or contact with high concentrations may cause chemical burns. When handling, wear thick nitrile rubber gloves, long-sleeved protective clothing, and high-top safety boots to avoid exposing the skin. If accidental contact occurs, immediately flush the affected area with plenty of running water for at least 15 minutes. If burning pain or ulceration occurs, seek medical attention immediately.

• Eye Protection

If calcium hydroxide powder or solution splashes into the eyes, it will irritate the conjunctiva and cornea, causing conjunctival congestion, severe pain, and blurred vision. In severe cases, it can damage the corneal epithelium. Wear impact-resistant goggles during operation. During dusty processes such as feeding and mixing, it is recommended to use a full-face mask for enhanced protection. If eye contact occurs, immediately lift the eyelids and flush continuously with plenty of sterile saline or water for 15-20 minutes. Do not rub your eyes during this time, and seek medical attention as soon as possible. 

• Respiratory Protection

Inhalation of calcium hydroxide dust can irritate the nasal, pharyngeal, and respiratory mucosa, causing cough, dry throat, and chest tightness. Long-term inhalation may also induce bronchitis. Operations must be carried out in a fume hood or a forced-ventilation work area, while wearing a KN95 or higher level dust mask; a half-face respirator may be used if necessary. Prolonged grinding and sieving operations without protection are prohibited. Ventilate the area immediately after operation.

• Ingestion Protection

Calcium hydroxide is not edible. Ingestion can burn the mucosa of the mouth, esophagus, and gastrointestinal tract, causing nausea, vomiting, and severe abdominal pain. Thoroughly wash hands after handling. Eating, drinking, and smoking are strictly prohibited in the work area. The product must be stored in a sealed container in a dedicated warehouse, strictly isolated from food, beverages, and animal feed. The packaging must be labeled with warnings such as "Strong Alkaline Corrosive" and "Do Not Ingest." If ingestion occurs, do not induce vomiting. Immediately drink plenty of milk or egg whites (to neutralize the alkalinity and protect mucous membranes) and seek medical attention with the product label in hand. 

II. Storage and Transportation Safety Precautions

• Storage Requirements

    - Store in a cool, dry, and well-ventilated dedicated warehouse, away from fire and heat sources. The warehouse temperature should be controlled below 35℃, and the relative humidity should not exceed 60% to prevent the product from absorbing moisture, clumping, or deteriorating.

    - Use sealed, moisture-proof packaging (such as woven bags lined with plastic film or sealed containers). When stacking, elevate the bottom at least 15cm and maintain a 30cm distance from the wall to avoid contact with damp surfaces. Once opened, the product should be used as soon as possible; any remaining product must be resealed tightly.

    - Do not store with acids, acidic oxides, or water-soluble salts, such as hydrochloric acid, sulfuric acid, carbon dioxide, or ammonium chloride, to prevent neutralization or double decomposition reactions that could lead to deterioration. Store separately from other chemical products, with clearly marked isolation areas.

    - The storage area should be equipped with dry spill response equipment (dry brooms, shovels, sealed containers) and appropriate fire extinguishers (dry powder fire extinguishers).

• Transportation Requirements

       - Transport vehicles must be kept dry and clean. Moisture-proof tarpaulins should be laid inside the vehicle to prevent the product from coming into contact with moisture. During transportation, the tarpaulin should be tightly covered to prevent rain, moisture, and dust.

    - Handle with care during loading and unloading to prevent packaging damage and powder leakage. Mixing with acids, food, or daily chemical products is strictly prohibited. Loading and unloading personnel must wear full protective gear.

    - Follow regulations for the transportation of alkaline corrosives. Transportation routes should avoid sensitive areas such as residential areas, schools, and water sources. Regularly check the packaging for damage during transport.

III. Leakage Emergency Handling

• Small Leakage: Immediately collect the leaked material into a sealed, dedicated container using a dry broom or shovel. Label it "Waste Calcium Hydroxide" and hand it over to a qualified unit for disposal. Do not discard it indiscriminately. Avoid washing the leaked area with water to prevent the formation of alkaline wastewater that pollutes the environment.

• Large-scale leakage: Immediately establish a warning zone, prohibiting unauthorized personnel and vehicles from entering; contain the leak area with dry sand or impermeable mats to prevent powder spread; handling personnel must wear protective clothing, goggles, dust masks, and thick gloves, and maintain dryness throughout the process; collect the leaked material and seal it for safe transfer, avoiding contact with air and moisture.

IV. Environmental Safety Precautions

Calcium hydroxide is highly alkaline. If a large amount enters a water body, it will cause a sharp increase in the pH value, damaging the aquatic ecosystem and causing the death of aquatic organisms such as fish and shrimp. Waste residue and wastewater generated during the production process must be neutralized (by adding an appropriate amount of weak acid to adjust the pH to around 7) before discharge. Direct discharge into rivers, lakes, or other natural water bodies is strictly prohibited.

Discarded calcium hydroxide packaging must be collected and disposed of by professional institutions; it must not be discarded arbitrarily. Expired or scrapped calcium hydroxide must be entrusted to a qualified hazardous waste treatment unit for disposal; unauthorized burial or mixing with domestic waste is prohibited.