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D4757-98 – Standard Test Method Technical Guide
⚠️ Placard Warning and Hazard Statements
Section 5 of ASTM D4757‑98 specifies the exact language that must appear on a placard attached to a solvent vapor degreaser. These statements address the full spectrum of risks associated with halogenated solvents, including acute toxicity, flammability, and chronic health effects.
| 🟦 Hazard Category | 📐 Required Placard Statement (Per D4757‑98) |
|---|---|
| Solvent Identity | This Machine Contains: (Name of Solvent) |
| Inhalation / Anesthesia | Warning! Vapor Harmful. Avoid Prolonged or Repeated Breathing of Vapor. High vapor concentrations may cause unconsciousness or death. |
| Ventilation Control | Use Only with Adequate Ventilation. Ventilation must limit exposures below OSHA or ACGIH levels. Eye irritation and dizziness are indications of overexposure. |
| Fire / Explosion | Do Not Cut or Weld on or Near This Machine, unless all solvent has been drained and the equipment aired out. Fire or explosion can result. Do Not Smoke in the Vicinity of This Machine. |
| Confined Space | Do Not Enter This Machine Unless Proper Tank Entry Procedures Are Followed (Practice D 4276). |
| Skin Contact | Avoid Prolonged or Repeated Contact with Skin. Contact may cause skin irritation and dermatitis. |
| Eye Contact | Do Not Get in Eyes; Will cause discomfort and irritation. |
| Ingestion | Do Not Take Internally. Swallowing may cause injury, illness, or death. |
| Information Source | Consult Material Safety Data Sheet for Additional Information. |
⚠️ Technical Safety Note: The ventilation standard cited in the placard requires that vapor exposures remain below the OSHA Permissible Exposure Limits (PELs) established in 29 CFR 1910.1000, the ACGIH Threshold Limit Values (TLVs), or the solvent manufacturer’s own health guidelines—whichever is most stringent. Overexposure indicators specifically mentioned include eye irritation and dizziness.
⚙️ Compliance Requirements and First Aid Instructions
Per Section 4 of the standard, placards must be posted in a prominent location on the degreaser accessible to all workers. Section 6 requires that first‑aid instructions be posted directly on the equipment. The standard also emphasizes that it does not supersede federal, state, or local regulations; the user is responsible for full regulatory compliance.
| 🎯 Requirement | ⚡ Specification from D4757‑98 |
|---|---|
| Placard Location | Posted on the vapor degreaser in a prominent place(s), accessible to workers using the equipment. |
| First Aid | Post first aid instructions on the solvent vapor degreaser. Consult the supplier’s Material Safety Data Sheet (MSDS) or label for appropriate statements. |
| Confined Space Entry | Tank entry must follow the detailed procedures outlined in Practice D 4276 (Confined Area Entry). |
| Regulatory Limits | Ventilation must control exposures to levels set by OSHA (29 CFR 1910.1000) or ACGIH TLVs. |
| Additional Information | Any specific or additional hazard information should be requested from the solvent supplier. |
💡 Best Practice Tip: D4757‑98 strongly recommends referring to Practice D 3698 (Solvent Vapor Degreasing Operations) for comprehensive operational guidance. Always cross‑reference the placard’s solvent‑specific warnings with the current Safety Data Sheet (SDS) to ensure the placard reflects the latest health data.
🛡️ Significance and Referenced Standards
Section 3 of the standard highlights why placarding is critical: solvent vapor degreasers operate with halogenated hydrocarbons, which carry severe health risks in confined or poorly ventilated spaces. A properly placarded degreaser provides a constant, on‑equipment reminder of safe operating procedures and emergency actions.
The key referenced standards provide the broader safety framework for this practice:
- ASTM D 3698 – Practice for Solvent Vapor Degreasing Operations.
- ASTM D 4276 – Practice for Confined Area Entry.
- OSHA 29 CFR 1910.1000 – Air contaminants and permissible exposure limits.
- ACGIH TLV‑TWA – Threshold Limit Values–Time Weighted Averages for chemical substances.
❓ Frequently Asked Questions
🔍 What is the main objective of ASTM D4757‑98?
The primary objective is to provide a uniform set of warning, first‑aid, and operating instructions for posting on vapor degreasers (Section 1.1). This ensures workers are consistently warned about the specific hazards of the halogenated solvent in use (Section 3.1).
💡 Does the placard in D4757‑98 replace OSHA or local safety regulations?
No. Section 1.3 explicitly states the standard does not address all safety concerns. Section 4.1 warns that placarding may also be subject to applicable federal, state, and local laws. It is the user’s responsibility to comply with regulations such as OSHA 29 CFR 1910.1000.
⚡ What specific equipment operation is prohibited on or near the degreaser?
Section 5.1.5 explicitly prohibits cutting or welding on or near the machine unless all solvent has been drained and the equipment has been fully aired out, as fire or explosion can result. Smoking is also prohibited in the vicinity (Section 5.1.10).
© 2026 TNLab — This article is a technical interpretation for reference only. The original standard as published by ASTM International takes precedence.