4-PHENYLAZOPHENOL

Safety Data Sheet
Emergency Telephone Number: CHEMTREC 1-800-424-9300       For Information call: DUDLEY 732-886-3100       
      DUDLEY CORPORATION
           	125 Kenyon Drive
       				         	 Lakewood, New Jersey 08701
Effective Date: January 1, 2025	
1. PRODUCT ID: Syn:  Solvent Yellow 7, 4-Hydroxyazobenzene 	CAS No.: 1689-82-3 E-C No.:216-880-6 Weight:  198.22/mol 	Formula: C12H10N2O

2. HAZARDS ID: GHS Class:  Acute aquatic  toxicity (Category 2)	Chronic aquatic toxicity (Category 2)
 Pictogram: 				
Signal Word:       none
HAZARD STATEMENT(S):	H411: Toxic to aquatic life with long lasting effects. 
PRECAUTIONARY STATEMENT(S) : P273: Avoid release into the environment   P391: Collect spillage
P501: Dispose of contents/container to an approved waste disposal plant.

HMIS Classification: Health hazard  2, Flammability   0,  Physical hazards   0			
NFPA Rating: Health hazard  2, Fire     0, Reactivity hazard   0

Potential Effects: Eye: Risk of serious damage to eyes.	Skin: Harmful in contact with skin. 
Ingestion: Harmful if swallowed. 		Inhalation: Harmful by inhalation. 
2.3: Other Hazards: none

3. COMPOSITION / INFO ON INGREDIENTS: 
Chemical Name			 CAS No.	 	Percent		
4-Hydroxyazobenzene                	1689-82-3               90-100%                  

4. FIRST AID: Eyes: rinse with plenty of water as precaution. Skin: Rinse with plenty of soap & water 
Ingestion: Do not induce vomiting without medical advice. Rinse with water. Consult physician.
Inhalation: Move to fresh air.  Physician: Treat symptomatically and supportively. 

5. FIRE FIGHTING: Info:  wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH & full PPE.  Irritating & highly toxic gases may be generated by thermal decomp/combustion. Hazards: Carbon & nitrogen oxide Extinguishing: Water Spray, Carbon Dioxide, Dry Chem or alcohol-resistant foam. Flash Pt:  N/A. Auto-ignition Temp: N/A Explosion Limits:  N/A

6. ACCIDENTAL RELEASE: Info: Wear self-contained breathing apparatus, rubber boots and heavy rubber gloves.  Spills/Leaks:  Sweep up, place in a bag and hold for waste disposal.  Avoid raising dust.  Ventilate area and wash 
spill site after material pickup is complete.  

7. HANDLING & STORAGE: Handling: Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Storage: Store in a tightly closed container.  Protect container from physical damage.  Store in a cool, dry ventilated area from sources of heat or ignition.

8. EXPOSURE: Facilities storing or utilizing this material should be equipped with an eyewash facility and safety shower. Use adequate ventilation to keep airborne concentrations low.
Chemical				ACGIH		NIOSH		OSHA-Final / Vacated PELs
4-Phenylazophenol			None listed	None listed	None listed

PPE: Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA’s eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators: Follow the OSHA respirator regulations found in 29 CFR 1910.134 or European Standard EN 149. Use a NIOSH/MSHA or European Standard EN 149 approved respirator if exposure limits are exceeded or if irritation or other symptoms are experienced.

9. PHYSICAL & CHEM:  Appearance: Yellow to gold powder Melting Pt: 150-152˚C(302-306˚F) 

10. STABILITY & REACTIVITY: Stability: Stable under normal temp/pressures. Avoid:  Incompatibles, dust generation, 
excess heat. Haz Decomp: see section 5  Incompatibilities: Strong Oxidizing Agents, Strong Bases.

11. TOXICOLOGICAL INFO: RTECS#: SM8300000LD50/LC50::  Not available.
Carcinogenicity:  CAS#1689-82-3:  Not listed by ACGIH, IARC, IARC, NTP, or OSHA
Mutagenicity:  Histidine reversion (Ames)	Other: may cause respiratory irritation

12. ECOLOGICAL INFO: Environmental Fate/Toxicity:LC50 (Fathead minnow)1.09mg/l-96h Toxic to aquatic life

13. DISPOSAL CONSIDERATIONS: Disposal: Chemical waste generators must determine whether a discarded chemical is classified as a hazardouswaste.  US EPA guidelines for the classification determination are listed in 40 CFR Parts 261.3. Additionally, waste generators  must consult state and local hazardous waste regulations to ensure complete and accurate classification. RCRA P-Series: None listed. RCRA U-Series: None listed. 

14. TRANSPORT INFO: Not regulated as a hazardous material.

15. REGULATORY INFO: SARA  311/312:  Chronic health Hazard
SARA Section 302 Extremely Hazardous Substances None of the chemicals in this product have a TPQ/RQ.
Section 313 No chemicals are reportable under Section 313. 
STATE CAS# 1689-82-3 is not present on state lists from CA, MA, MN, FL. 
PA & NJ Right To Know: 4-Hydroxyazobenzene CAS#1689-82-3
California Prop 65:  No Significant Risk Level: None of the chemicals in this product are listed. 

EUROPEAN/INTERNATIONAL REGULATIONS European Labeling in Accordance with EC Directives 
Hazardous Symbols: Not available.WGK (Water Danger/Protection) CAS#1689-82-3:  No information available. 
Canada - DSL/NDSLCAS#1689-82-3 is listed on Canada’s NDSL List. 
Canada – WHMIS:  Not available.   CAS#1689-82-3 is not listed on Canada’s Ingredient Disclosure List. 

16. DISCLAIMER INFO: DUDLEY CORPORATION provides the information herein in good faith but makes no representation as to its comprehensiveness or accuracy. This document is intended only as a guide to the appropriate precautionary handling of the material by a properly trained person using this.  Individuals receiving the information must exercise their independent judgment in determining its appropriateness for a particular purpose. DUDLEY CORPORATION makes no representations or warranties, either expressed or implied, including without limitation and warranties of merchantability, fitness for a particular purpose with respect to the information set forth herein or to the product to which the information refers. Accordingly, DUDLEY CORPORATION will not be responsible for damages resulting from the use of or reliance upon this information.