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Product Name: 2-Diazo-1-naphthol-5-sulfonyl chloride
Synonyms: DNNSC
Chemical Formula: C10H5ClN2O3S
Chemical Family: Diazonaphthol derivatives
CAS Number: 6358-77-2
Intended Use: Photoresist materials, optical industry, synthetic intermediate
Manufacturer Details: Chemical supplier, address, emergency contact number available from SDS sheet with supplier
Hazard Class: Acute toxicity, skin and eye irritation, respiratory hazard, environmental hazard
Signal Word: Danger
Hazard Statements: May cause severe skin burns and eye damage; may be harmful if inhaled or ingested; causes serious eye irritation; toxic to aquatic organisms with long-lasting effects
Pictograms: Corrosive, exclamation mark, environment
Precautionary Statements: Avoid breathing dust or fumes; wear protective clothing, gloves, and goggles; avoid release to environment; wash hands thoroughly after handling
Chemical Name: 2-Diazo-1-naphthol-5-sulfonyl chloride
Concentration: 98-100% (pure solid form)
Impurities: Less than 2%, typically sulfonic acid derivatives and related naphthol byproducts
Other Components: None
Inhalation: Move exposed person to fresh air immediately. If symptoms (difficulty breathing, cough, irritation) persist, seek medical attention without delay.
Skin Contact: Remove contaminated clothing. Rinse skin with plenty of water for at least 15 minutes. Seek medical attention if irritation or burns appear.
Eye Contact: Rinse eyes cautiously with water for several minutes, lifting eyelids for thorough washing. Remove contact lenses if possible. Obtain medical help immediately.
Ingestion: Do not induce vomiting. Rinse mouth with water. Seek immediate medical help, stating exact nature of exposure.
Advice to Physicians: Treat symptomatically and supportively. Respiratory and cardiovascular monitoring may be necessary.
Suitable Extinguishing Media: Dry chemical, CO2, foam, water spray only to cool containers
Unsuitable Extinguishing Media: Avoid direct water jet; product may react violently
Hazards from Combustion: May release toxic and corrosive gases, including hydrogen chloride, nitrogen oxides, sulfur oxides
Protective Equipment: Full-body protective gear and self-contained breathing apparatus required for fire crews
Firefighting Instructions: Approach fire from upwind and avoid inhalation of combustion products; keep containers cool with water spray
Personal Precautions: Evacuate unnecessary personnel. Avoid breathing dust or fumes. Wear chemical-resistant gloves, protective suit, safety goggles, and NIOSH-approved respirator.
Environmental Precautions: Prevent further leakage or spillage if safe to do so. Avoid discharge into drains, waterways, or soil.
Methods for Cleanup: Use non-sparking tools. Sweep up, place in clearly labeled containers for disposal according to local regulations. Ventilate area. Wash site after material pickup is complete to remove residues.
Disposal of Contaminated Material: Collect waste for chemical disposal. Do not allow into surface water or sewer systems.
Handling: Avoid contact with skin, eyes, or clothing. Always handle inside fume hood or well-ventilated area, using recommended PPE.
Storage: Keep container tightly closed in a cool, dry, and well-ventilated location, away from incompatible substances such as water, strong bases, and oxidizing agents. Store apart from food and beverages. Do not store near heat, flames, or direct sunlight.
Other Notes: Clearly label storage area. Routinely check integrity of containers.
Engineering Controls: Use chemical fume hood, local exhaust ventilation, or other engineering controls to prevent airborne exposure.
Personal Protective Equipment: Wear butyl or nitrile gloves, lab coat, chemical safety goggles or face shield, and suitable respiratory protection (NIOSH-approved) in case of inadequate ventilation.
Hygiene Measures: Do not eat, drink, or smoke during use. Wash hands, face, and exposed skin before breaks and at end of work. Remove contaminated clothing immediately.
Appearance: Light yellow to brown solid powder
Odor: No distinct odor or faint chemical smell
Melting Point: 170–175°C
Boiling Point: Decomposes before boiling
Solubility: Decomposes in water, soluble in some organic solvents (acetone, chloroform, DMF)
Vapor Pressure: Not available (decomposes)
pH: Not applicable
Flammability: Not classified as flammable, but may emit toxic fumes if burned
Flash Point: Data not available
Decomposition Temperature: Above 180°C
Density: Approximately 1.5 g/cm3
Chemical Stability: Stable under recommended storage conditions, but sensitive to moisture and light
Conditions to Avoid: Exposure to moisture, strong heat, ultraviolet or direct sunlight, incompatible materials, and open flames
Incompatible Materials: Water, strong bases, alcohols, strong oxidizers, amines
Hazardous Decomposition Products: Hydrogen chloride, nitrogen oxides, sulfur oxides, carbon oxides
Possibility of Hazardous Reactions: Violent reaction with water; hazardous polymerization does not occur
Potential Routes of Exposure: Inhalation, skin contact, ingestion, eye contact
Acute Effects: Causes severe burns to skin, eyes, and mucous membranes; may cause respiratory irritation or coughing; ingestion can cause abdominal pain, vomiting, and chemical burns
Chronic Effects: Long-term exposure can cause dermatitis, allergic skin reactions, long-term respiratory effects
Toxicity Data: LD50 (oral, rat): data not available; LD50 (dermal, rabbit): data not available
Carcinogenicity: No data available; not listed by IARC, NTP, OSHA
Other Information: Not expected to be mutagenic or teratogenic based on related compounds, but no definitive studies performed
Ecotoxicity: Toxic to aquatic life; exact LC50 values not available; may cause long-lasting adverse effects in aquatic environments
Persistence and Degradability: Expected to have low persistence; hydrolyzes in water
Bioaccumulation: Not likely to bioaccumulate due to rapid degradation
Mobility in Soil: Limited; hydrolyzes when in contact with moisture
Other Adverse Effects: Avoid release to waterways or soil; substance not approved for broad environmental exposure
Waste Disposal Methods: Dispose of as hazardous chemical waste according to local, regional, and national regulations. Do not pour down the drain or discard in regular waste.
Contaminated Packaging: Dispose as hazardous material. Clean containers only if absolutely necessary and comply with regulations.
Other Precautions: Incinerate in an approved and licensed incineration facility. Seek advice from an approved chemical waste disposal contractor.
UN Number: 3261
Proper Shipping Name: Corrosive solid, acidic, organic, n.o.s. (contains 2-Diazo-1-naphthol-5-sulfonyl chloride)
Transport Hazard Class: 8 (Corrosive)
Packing Group: II
Labels Required: Corrosive (8)
Marine Pollutant: Yes
Special Precautions for User: Avoid contact with water during transport and storage, use robust containers, clearly label for hazardous contents
TSCA Status: Listed, for research and development use only
REACH Status: Not registered or not applicable for volume bands
OSHA Classification: Hazardous, corrosive solid
SARA Title III: Section 311/312—Acute health hazard; Section 313—Not listed
WHMIS Classification: D1B (Toxic), E (Corrosive)
Labeling Requirements: Corrosive, harmful, environmental hazard. Use all recommended precautions when handling, transporting, or disposing.
