CBJ Safety and Compliance 3 — Questions and Answers
Question 1: What is the primary hazard associated with prolonged skin contact with casting investment powder?
- Absorption of heavy metals through the skin
- Allergic dermatitis and irritation due to calcium sulfate and silica content (Correct answer)
- Permanent staining of the skin from colorants in the powder
- Thermal burns from the exothermic mixing reaction
Correct answer: Allergic dermatitis and irritation due to calcium sulfate and silica content
Investment powder contains silica and calcium sulfate, which can cause skin irritation and dermatitis with repeated or prolonged contact.
Question 2: When operating a burnout kiln in a jewelry studio, the work area must have:
- A humidity level above 70% to prevent static discharge
- Adequate ventilation to exhaust combustion gases and organic binder fumes (Correct answer)
- Fluorescent lighting only to prevent UV exposure from the kiln
- A concrete floor rated to support the kiln's electrical load
Correct answer: Adequate ventilation to exhaust combustion gases and organic binder fumes
Burning out organic binders from investment molds releases toxic fumes and combustion gases that must be exhausted to prevent health hazards.
Question 3: Which personal protective equipment is required when operating an ultrasonic cleaner with solvent-based solution?
- Steel-toed boots and hard hat
- Chemical-resistant gloves and eye protection (Correct answer)
- Hearing protection only, as ultrasonics generate excessive noise
- High-visibility vest for workshop safety
Correct answer: Chemical-resistant gloves and eye protection
Solvent-based ultrasonic cleaning solutions can splash and are absorbed through the skin, requiring chemical-resistant gloves and eye protection.
Question 4: The Globally Harmonized System (GHS) pictogram showing a flame over a circle indicates:
- Flammable substance
- Oxidizer that can intensify fires (Correct answer)
- Explosive material
- Corrosive substance
Correct answer: Oxidizer that can intensify fires
The GHS oxidizer pictogram—a flame above a circle—identifies substances that can release oxygen and intensify or cause fires.
Question 5: How should compressed gas cylinders (e.g., oxygen and acetylene) be stored in the jewelry workshop?
- Laying flat on the floor to prevent tipping
- Chained or strapped upright and separated by a fire-rated barrier or 20 feet (Correct answer)
- Stored together in an enclosed cabinet to contain leaks
- Kept near a heat source to maintain regulator performance
Correct answer: Chained or strapped upright and separated by a fire-rated barrier or 20 feet
Cylinders must be secured upright to prevent falling and separated to reduce the risk of a fire involving both fuel and oxidizer gases simultaneously.
Question 6: A bench jeweler notices their soldering flux is emitting white fumes with a sharp odor. The FIRST action should be to:
- Continue working and increase ventilation fan speed after finishing the piece
- Stop work, move away from fumes, and identify the flux composition on the SDS (Correct answer)
- Apply a damp cloth over the nose and mouth and finish soldering quickly
- Switch to a different brand of flux without consulting SDS information
Correct answer: Stop work, move away from fumes, and identify the flux composition on the SDS
White, sharp-smelling fumes may indicate fluoride-based flux, which is highly toxic; stopping work and consulting the SDS ensures appropriate protective action.
Question 7: What is the purpose of a Ground Fault Circuit Interrupter (GFCI) outlet at the jeweler's bench?
- To regulate voltage and prevent surges that damage polishing motors
- To quickly interrupt power when a current difference between hot and neutral is detected, preventing electrocution (Correct answer)
- To provide a dedicated circuit so multiple tools can run simultaneously
- To monitor total amperage draw and log energy consumption
Correct answer: To quickly interrupt power when a current difference between hot and neutral is detected, preventing electrocution
A GFCI detects leakage current as small as 4–6 milliamps and shuts off power within milliseconds, protecting workers near water or damp conditions from fatal shock.
CBJ Safety and Compliance 3
What is the primary hazard associated with prolonged skin contact with casting investment powder?