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Safety Protocol 001: Glass Engraving and Finishing Hazards

Protocol ID: U12M4-SAFE-001

Potential Hazards

1. Chemical Exposure — Etching Cream (Bifluoride Compounds)

Severity: High - Commercial etching creams contain sodium bifluoride or ammonium bifluoride - These compounds release hydrofluoric acid (HF) slowly upon contact with moisture - HF penetrates skin and causes deep tissue damage — may be delayed for hours - Fluoride ion binds calcium in bones and blood, causing systemic toxicity - Eye contact causes severe corneal damage - Standard nitrile gloves do NOT provide adequate protection — HF penetrates nitrile

2. Silica Dust — Rotary Engraving and Sandblasting

Severity: High (chronic, cumulative) - Rotary engraving and sandblasting produce fine silica particles - Dry engraving without lubrication generates airborne respirable dust - Sandblast cabinets contain high concentrations of mixed abrasive and silica dust - Chronic exposure causes silicosis — irreversible, progressive lung fibrosis - Aluminum oxide blast media also causes respiratory irritation

3. High-Velocity Particle Injury — Sandblasting

Severity: High - Sandblast media propelled at 40-90 PSI causes severe skin abrasion - Eye contact with blast media causes corneal damage or permanent vision loss - Blast stream can ricochet off glass surface unpredictably - Compressed air alone (without media) can cause injury at close range

4. Thermal Burns — Fire Polishing

Severity: Medium to High - Torch flames used for fire polishing exceed 2000°F - Glass becomes hot during fire polishing — not visibly (below 400°F) - Re-heated glass can thermally shock and shatter, propelling fragments - Torch flame ignites hair, paper, and synthetic clothing

5. Laceration — Rotary Tool and Glass Fragments

Severity: Medium - Rotary tool burrs cause deep lacerations if they contact skin - Engraving can chip glass, ejecting sharp fragments - Thin glass may crack during engraving from excessive pressure or thermal stress

6. Noise — Rotary Tools and Sandblast Equipment

Severity: Low to Medium (chronic) - Rotary tools at working speed produce 70-85 dB - Sandblast compressors and blast cabinets exceed 85 dB - Prolonged exposure causes cumulative hearing damage

Required Precautions

Chemical Etching

  1. Chemical-resistant gloves (neoprene or butyl rubber) are mandatory — NEVER use nitrile or latex
  2. Safety glasses or chemical splash goggles are mandatory
  3. Calcium gluconate gel must be immediately accessible at the workstation — verify before starting
  4. Work in ventilated area — fume hood preferred, open window minimum
  5. Apply cream in a plastic containment tray to catch drips
  6. Never touch cream with bare hands, even briefly
  7. Rinse all tools and surfaces thoroughly after use
  8. Dispose of cream, rinse water, and applicators in hazardous waste container
  9. Do not mix etching cream with any other chemicals
  10. If skin contact occurs: rinse 5 minutes with water, apply calcium gluconate, notify instructor, seek medical evaluation

Rotary Engraving

  1. Maintain wet engraving technique — apply water continuously during engraving
  2. Set rotary tool speed to 15,000-25,000 RPM — do not exceed 25,000 RPM on glass
  3. Wear safety glasses at all times
  4. Wear dust mask (N95 minimum) as backup to wet technique
  5. Secure glass on non-slip surface — prevent movement during engraving
  6. Keep fingers clear of burr contact area
  7. Unplug tool before changing burrs
  8. Clean glass dust slurry with wet methods only

Sandblasting

  1. Use enclosed blast cabinet only — open sandblasting is prohibited in educational settings
  2. Blast cabinet gloves must be intact — inspect before each use
  3. Wear safety glasses even when using the cabinet (viewing window protection)
  4. Wear hearing protection when operating compressor and blast cabinet
  5. Ensure cabinet ventilation/dust collection is operational before use
  6. Do not open cabinet door while pressurized
  7. Clean blast cabinet filter/dust collection regularly

Fire Polishing

  1. All torch safety protocols from Module 3 apply
  2. Preheat glass before flame contact — thermal shock shatters glass and propels fragments
  3. Use quick sweeping passes — never linger in one spot
  4. Wear IR-rated safety glasses during fire polishing
  5. Place fire-polished pieces on insulating surface — they are hot
  6. Secure hair, remove synthetic clothing, wear leather apron

Emergency Response

Etching Cream Skin Contact

  1. Rinse affected area under running water for 5 minutes immediately
  2. Apply calcium gluconate gel generously to the exposed area
  3. Notify instructor — document the exposure
  4. Seek medical evaluation even if symptoms are mild — fluoride damage is delayed
  5. Continue applying calcium gluconate every 15 minutes until medical evaluation

Etching Cream Eye Contact

  1. Flush eyes at eyewash station for 15 minutes minimum — hold lids open
  2. Do NOT rub eyes
  3. Seek immediate medical attention — ophthalmology evaluation required
  4. Inform medical responders that exposure involves bifluoride/HF compound

Sandblast Injury

  1. If skin exposed to blast stream: clean wound with water, assess depth, seek medical attention for deep abrasion
  2. If eye exposed: flush with water, do NOT rub, seek immediate ophthalmology evaluation
  3. If inhaled significant dust: move to fresh air, seek medical evaluation for respiratory assessment

Glass Fragment Eye Injury

  1. Do NOT remove embedded fragments
  2. Cover eye loosely with clean gauze
  3. Seek immediate medical attention

PPE Requirements

Hazard PPE Specification When Required
Chemical (etching cream) Chemical-resistant gloves Neoprene or butyl rubber (NOT nitrile) All etching cream handling
Chemical splash Splash goggles or safety glasses Chemical-rated, full coverage All etching cream handling
Chemical antidote Calcium gluconate gel Accessible at workstation All etching cream activities
Silica dust (rotary) Water lubrication + N95 mask Continuous wet technique; mask as backup All rotary engraving
Particles (sandblast) Enclosed blast cabinet Cabinet gloves intact, viewing window clear All sandblasting
Noise Ear protection Rated for 85+ dB Sandblasting and extended rotary work
Thermal (fire polish) IR-rated glasses + leather apron Didymium or shade 3-5 lenses All fire polishing
Fragments Safety glasses ANSI Z87.1 rated All engraving and finishing operations

Last Updated: 2026-03-19