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Safety Protocol 001: Hot Glass Operations — Kiln and Torch Safety

Protocol ID: U12M3-SAFE-001

Potential Hazards

1. Severe Thermal Burns

Severity: Critical - Kiln interiors reach 1500°F+ (815°C+) during fusing operations - Torch flames exceed 2000°F (1093°C) at the hottest point - Hot glass is visually identical to cold glass below 400°F — no warning color - Contact with surfaces at 70°C (158°F) can cause full-thickness burns within 3-5 seconds; surfaces at 80°C+ cause near-instantaneous burns - Molten glass adheres to skin, causing deep, extended-contact burns

2. Infrared and UV Radiation Eye Damage

Severity: Critical (irreversible, cumulative) - Hot glass and kiln interiors emit intense infrared radiation - Torch flames emit UV and IR radiation - Damage is cumulative — each unprotected exposure adds to lifetime risk - Chronic exposure causes cataracts, retinal damage, and vision loss - Symptoms may not appear for months or years after exposure

3. Fire and Explosion

Severity: Critical - Torch fuel gases (propane, natural gas) are flammable and potentially explosive - Gas leaks in enclosed spaces create explosive atmospheres - Torch flame ignites paper, cloth, hair, and synthetic materials instantly - Hot glass or kiln surfaces can ignite nearby flammable materials

4. Toxic Fumes and Combustion Products

Severity: Medium to High - Torch combustion produces carbon monoxide and carbon dioxide - Some glass types release fumes when heated (especially lead glass — never flamework lead glass) - Kiln wash and fiber materials release particles during initial firing - Bead release compounds produce fumes when heated

5. Thermal Shock Injuries

Severity: Medium - Glass shattering from thermal shock can propel sharp fragments - Opening a hot kiln causes rapid temperature changes that shatter pieces - Quenching hot glass in water produces explosive shattering and steam

Required Precautions

Kiln Operation

  1. Inspect kiln before every use: check elements, thermocouple, lid seal, and controller function
  2. Coat shelves with kiln wash or use shelf paper before every fusing load
  3. Maintain 3-foot clearance around kiln during operation — mark with warning tape
  4. Never open kiln above 200°F (93°C) — thermal shock destroys pieces and releases hot air
  5. Use kiln peephole for viewing during firing — limit viewing time even with IR glasses
  6. Set kiln timer for all programs — never estimate firing times
  7. Keep kiln area clear of flammable materials (paper, wood, fabric, solvents)
  8. Only instructor operates kiln controller, loads, and unloads

Torch Operation

  1. Check all gas connections for leaks before every session (soapy water test on fittings)
  2. Ensure ventilation system is running before lighting any torch
  3. Light torch with striker only — never use lighters, matches, or another torch
  4. Lighting sequence: fuel first (small flame), then gradually add oxygen
  5. Shutdown sequence: close oxygen first, then fuel
  6. Keep torch area clear of flammable materials for 3 feet in all directions
  7. Never leave a lit torch unattended — not even briefly
  8. If fuel smell is detected without a lit flame: shut off gas at source, evacuate, ventilate, do not create sparks
  9. Secure all fuel lines — they must not be trippable or pullable

Glass Handling at Temperature

  1. Assume ALL glass on a hot work surface is hot — touch nothing without thermal gloves
  2. Use tongs or mandrels to handle glass near or in the flame
  3. Place hot glass on insulating surfaces only (kiln shelf, ceramic tile, fiber blanket)
  4. Never place hot glass on wood, plastic, paper, or metal work benches
  5. Allow pieces to cool completely before handling — minimum 30 minutes for small items, longer for large
  6. Never quench hot glass in water (soda-lime explodes; even borosilicate is dangerous with large pieces)

Emergency Response

Thermal Burn

  1. Remove from heat source immediately
  2. Cool burn under running cool water for 10-20 minutes
  3. Do not apply ice, butter, oils, or ointments
  4. If molten glass is adhered to skin: cool with water, do NOT pull glass off — seek immediate medical attention
  5. Cover with clean, non-adhesive dressing
  6. Seek medical attention for burns larger than 2 inches, deep burns, or burns on face, hands, or joints

Fire

  1. If small and contained: shut off fuel, use Class B fire extinguisher (aim at base, sweep side to side)
  2. If spreading or uncontrolled: evacuate immediately, call 911
  3. If clothing is on fire: stop, drop, roll — do NOT run
  4. If fuel line is burning: shut off fuel at the source if safe to do so; evacuate if not

Gas Leak

  1. Shut off gas at source immediately
  2. Do NOT operate any switches, lights, or electronic devices (spark risk)
  3. Evacuate the area
  4. Ventilate from outside if possible (open windows/doors from outside the room)
  5. Do not re-enter until gas has dissipated and source is identified and repaired

Eye Exposure to IR/UV

  1. Leave the hot work area immediately
  2. Do not rub eyes
  3. Rest in a dimly lit area
  4. If pain, redness, or vision changes persist beyond 30 minutes, seek ophthalmology evaluation
  5. Report the exposure — it indicates inadequate eye protection was in use

PPE Requirements

Hazard PPE Specification When Required
Thermal burns (hands) Thermal gloves 500°C+ rating; ASTM F539-compliant Kevlar or heavy-duty leather All kiln loading/unloading and torch work
IR/UV eye damage IR-rated safety glasses Didymium or shade 3-5 lenses, 99%+ UV/IR filtration All torch work and kiln viewing
Thermal burns (face) Face shield Polycarbonate, IR-rated Kiln opening and peephole viewing
Thermal burns (body) Leather apron Full-length, tied securely All torch work
Fire (hair) Hair restraint Tie back or cap All torch work and kiln area
Fire (clothing) Natural fiber clothing Cotton or wool only — NO synthetics All torch work
Fumes Ventilation system Exhaust hood or fume extractor, operational All torch work and kiln firing

Last Updated: 2026-03-19