9.2 GHS Labels, Safety Data Sheets, and Trade Secret Rules

GHS Labels, Safety Data Sheets, and Trade Secret Rules

Classification determines what a chemical is; labelling and the safety data sheet determine what a worker is told. OSHA prescribes both the required label elements and the fixed 16-section SDS order, and exam items routinely test whether a specific piece of information belongs on the label, in a numbered SDS section, or neither.

1. Mandatory GHS Container Label Elements

Under 29 CFR 1910.1200(f), manufacturers, importers, and distributors must ensure that every container of hazardous chemicals leaving the workplace is labeled with six mandatory elements:

+-------------------------------------------------------------------------+
|                  STANDARDIZED GHS SHIPPED CONTAINER LABEL               |
+-------------------------------------------------------------------------+
|  [1] PRODUCT IDENTIFIER: Acetone Technical Grade, UN 1090               |
|                                                                         |
|  [2] SIGNAL WORD: DANGER                                                |
|                                                                         |
|  [3] HAZARD STATEMENTS:                                                 |
|      - H225: Highly flammable liquid and vapor.                         |
|      - H319: Causes serious eye irritation.                             |
|      - H336: May cause drowsiness or dizziness.                         |
|                                                                         |
|  [4] PRECAUTIONARY STATEMENTS:                                          |
|      - P210: Keep away from heat, hot surfaces, sparks, open flames.    |
|      - P280: Wear protective gloves/eye protection/face protection.     |
|      - P305+P351+P338: IF IN EYES: Rinse cautiously with water...       |
|      - P403+P235: Store in a well-ventilated place. Keep cool.          |
|      - P501: Dispose of contents/container in accordance with regs.     |
|                                                                         |
|  [5] GHS PICTOGRAMS:           [6] SUPPLIER IDENTIFICATION:             |
|      +-------+  +-------+          Industrial Chemical Supply Corp.     |
|      | Flame |  | Excl. |          1000 Solvents Way, Austin, TX        |
|      |       |  | Mark  |          Emergency Phone: (800) 424-9300      |
|      +-------+  +-------+                                               |
+-------------------------------------------------------------------------+

The 6 Core Label Components Explained

1. Product Identifier: The chemical name, code number, or batch identifier that matches the exact identifier used on the SDS (Section 1) and master chemical inventory.
2. Signal Word: A single word used to indicate the relative severity of the hazard:
   • "DANGER": Used for more severe hazard categories (e.g., Acute Toxicity Cat 1–2, Flammable Liquid Cat 1–2, Carcinogen Cat 1A–1B).
   • "WARNING": Used for less severe hazard categories (e.g., Acute Toxicity Cat 4, Flammable Liquid Cat 3–4, Skin Irritation Cat 2).
   • Precedence Rule: If "Danger" applies, "Warning" must not appear on the label.
3. Hazard Statements (H-Codes): Standardized phrases assigned to a hazard class and category describing the nature of the hazard (e.g., H300: Fatal if swallowed, H350: May cause cancer).
4. Precautionary Statements (P-Codes): Standardized phrases describing recommended measures to minimize or prevent adverse effects from exposure, handling, or improper storage. Divided into four functional categories:
   • Prevention (P2xx): e.g., P260: Do not breathe dust/fume/gas/mist/vapors.
   • Response (P3xx): e.g., P301+P310: IF SWALLOWED: Immediately call a POISON CENTER/doctor.
   • Storage (P4xx): e.g., P405: Store locked up.
   • Disposal (P5xx): e.g., P501: Dispose of contents in accordance with local regulations.
5. Supplier Identification: The name, physical address, and emergency telephone number of the chemical manufacturer, importer, or responsible party.
6. GHS Pictograms: Diamond-shaped symbols with a black hazard glyph, white background, and red border (set on a point).

The 9 Standard GHS Pictograms

+-------------------------------------------------------------------------+
|                    SUMMARY OF GHS PICTOGRAM SYMBOLS                     |
+-------------------------------------------------------------------------+
|                                                                         |
|   [ HEALTH HAZARD ]      [ FLAME ]              [ EXCLAMATION MARK ]    |
|   - Carcinogen           - Flammable Liquid/Gas - Acute Toxicity Cat 4  |
|   - Mutagen              - Pyrophoric           - Skin/Eye Irritant     |
|   - Repro Toxicant       - Self-Heating         - Skin Sensitizer       |
|   - Resp Sensitizer      - Organic Peroxide     - STOT-SE Cat 3         |
|                                                                         |
|   [ CORROSION ]          [ GAS CYLINDER ]       [ SKULL & CROSSBONES ]  |
|   - Skin Burns (Cat 1)   - Compressed Gas       - Acute Toxicity Cat 1-3|
|   - Eye Damage (Cat 1)   - Liquefied Gas        - Fatal / Toxic Ingest, |
|   - Corrosive to Metal   - Cryogenic Gas          Dermal, Inhalation    |
|                                                                         |
|   [ FLAME OVER CIRCLE ]  [ EXPLODING BOMB ]     [ ENVIRONMENT ]         |
|   - Oxidizing Liquids    - Unstable Explosive   - Aquatic Toxicity      |
|   - Oxidizing Solids     - Self-Reactive A/B    - Non-Mandatory         |
|   - Oxidizing Gases      - Organic Peroxide A/B   under OSHA            |
+-------------------------------------------------------------------------+

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2. Standardized 16-Section Safety Data Sheet (SDS) Layout

Under 29 CFR 1910.1200(g), manufacturers and importers must provide an SDS for each hazardous chemical. The document must strictly adhere to the 16-section standardized format in the exact sequential order prescribed by GHS. OSHA enforces compliance with Sections 1 through 11 and Section 16; Sections 12 through 15 handle matters outside OSHA's statutory jurisdiction (governed instead by EPA and DOT):

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3. Trade Secrets and Emergency Medical Disclosure Rules

Under 29 CFR 1910.1200(i), chemical manufacturers, importers, or employers may withhold the specific chemical identity (chemical name, CAS number) or the exact percentage concentration of a substance from an SDS, provided they can support that the information is a bona fide trade secret.

Rules for Withholding Information

1. The claim that the information is withheld as a trade secret must be explicitly stated in Section 3 of the SDS.
2. The SDS must disclose all physical and health properties, toxicological effects, and required precautions, even if the specific chemical name is withheld.

Emergency Medical Disclosure (29 CFR 1910.1200(i)(2))

• Where a treating physician or nurse determines that a medical emergency exists and the specific chemical identity of a trade secret chemical is necessary for emergency or first-aid treatment, the chemical manufacturer, importer, or employer MUST immediately disclose the specific chemical identity to that physician or nurse.
• No Advance Written Agreement Required: The manufacturer cannot delay disclosure to demand a written confidentiality agreement or statement of need prior to release.
• Post-Emergency Follow-up: The manufacturer may require the treating physician or nurse to provide a written statement of need and a confidentiality agreement as soon as circumstances permit after the emergency has stabilized.

Non-Emergency Disclosure (29 CFR 1910.1200(i)(3))

In non-emergency industrial hygiene or occupational health scenarios (e.g., assessing health risks, designing local exhaust ventilation, conducting biological monitoring, establishing medical surveillance):

1. The health professional (IH, toxicologist, physician) must submit a written request detailing the specific occupational health need.
2. The request must explain why alternative non-confidential information is insufficient.
3. The health professional must sign a written confidentiality agreement agreeing not to use the trade secret for any purpose other than the health need.
4. If the employer refuses disclosure, the dispute may be referred to the OSHA Area Director for evaluation and citation.

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4. Worked Step-by-Step Classification Examples

Worked Example 8.1.1: Multi-Endpoint Health Hazard Classification & Label Specification

Problem: An industrial formulation facility blends a liquid solvent mixture. Laboratory toxicological bioassays and physical testing yield the following empirical data:

• Oral LD50 (rat): 180 mg/kg
• Inhalation LC50 (rat, 4-hour vapor): 3.2 mg/L
• Skin contact (rabbit, 4-hour occluded patch): Reversible erythema and edema (mean Draize score 2.8), completely clearing at Day 10.
• Flash Point: 28°C (closed cup); Initial Boiling Point: 110°C.
• Ames Test: Negative; No evidence of carcinogenicity or reproductive toxicity.

Determine:

1. The GHS hazard classifications for acute oral toxicity, acute inhalation toxicity, skin irritation, and flammability.
2. The assigned Signal Word for the shipped label.
3. The mandatory GHS Pictograms required on the container label.

Solution Steps:

1. Evaluate Acute Oral Toxicity:

   • Experimental value: LD50 = 180 mg/kg.
   • Cutoff criteria: Category 3 is > 50 to ≤ 300 mg/kg.
   • Classification: Acute Toxicity (Oral) — Category 3 (Signal Word: Danger; Pictogram: Skull and Crossbones; Statement: H301: Toxic if swallowed).

2. Evaluate Acute Inhalation Toxicity (Vapor):

   • Experimental value: LC50 = 3.2 mg/L (4-hour vapor).
   • Cutoff criteria: Category 3 vapor is > 2.0 to ≤ 10.0 mg/L.
   • Classification: Acute Toxicity (Inhalation: Vapor) — Category 3 (Signal Word: Danger; Pictogram: Skull and Crossbones; Statement: H331: Toxic if inhaled).

3. Evaluate Skin Irritation / Corrosion:

   • Observations: Reversible tissue irritation clearing at Day 10 (mean score 2.8 ≥ 2.3), no full-thickness dermal necrosis.
   • Classification: Skin Corrosion/Irritation — Category 2 (Skin Irritation) (Signal Word: Warning; Pictogram: Exclamation Mark; Statement: H315: Causes skin irritation).

4. Evaluate Flammability:

   • Flash Point = 28°C (≥ 23°C and ≤ 60°C).
   • Classification: Flammable Liquid — Category 3 (Signal Word: Warning; Pictogram: Flame; Statement: H226: Flammable liquid and vapor).

5. Determine the Overall Shipped Label Signal Word:

   • Acute Oral Cat 3 requires "Danger". Acute Inhalation Cat 3 requires "Danger". Skin Irritation Cat 2 and Flammable Liquid Cat 3 require "Warning".
   • Rule: When both "Danger" and "Warning" apply, "Danger" takes precedence and "Warning" must not appear.
   • Assigned Signal Word: DANGER.

6. Determine Required Label Pictograms:

   • Skull and Crossbones (for Acute Oral Cat 3 and Inhalation Cat 3)
   • Flame (for Flammable Liquid Cat 3)
   • Exclamation Mark (for Skin Irritation Cat 2)
   • Note on Precedence: GHS rules dictate that when Skull and Crossbones is present, the Exclamation Mark is omitted if used for acute toxicity, but it is retained for skin irritation (Cat 2).
   • Required Pictograms: Skull and Crossbones, Flame, Exclamation Mark.

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Worked Example 8.1.2: Flammable Liquid Category & Precautionary Profile Determination

Problem: A chemical manufacturing process utilizes a volatile raw solvent with a measured closed-cup Flash Point of 18°C (64.4°F) and an Initial Boiling Point of 32°C (89.6°F).

1. Classify the liquid into the appropriate GHS flammable liquid category.
2. State the required GHS Signal Word and Hazard Statement.
3. List the core standard Precautionary Statements across Prevention, Storage, and Disposal.

Solution Steps:

1. Evaluate Category Cutoffs:

   • Flash Point = 18°C < 23°C.
   • Initial Boiling Point = 32°C ≤ 35°C.
   • Under 29 CFR 1910.1200 Appendix B.6, a liquid with FP < 23°C and BP ≤ 35°C meets the criteria for Category 1.
   • (Note: If Boiling Point were > 35°C, it would be Category 2).

2. Determine Signal Word and Hazard Statement:

   • Classification: Flammable Liquid — Category 1.
   • Signal Word: DANGER.
   • Hazard Statement: H224: Extremely flammable liquid and vapor.

3. Assign Core Precautionary Statements:

   • Prevention (P2xx):
     • P210: Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
     • P233: Keep container tightly closed.
     • P240: Ground and bond container and receiving equipment.
     • P241: Use explosion-proof electrical/ventilating/lighting equipment.
     • P280: Wear protective gloves/protective clothing/eye protection/face protection.
   • Storage (P4xx):
     • P403+P235: Store in a well-ventilated place. Keep cool.
   • Disposal (P5xx):
     • P501: Dispose of contents/container in accordance with local/regional/national/international regulations.