Kiln Room Air
Your high school ceramics program has 26 students in one section, one electric kiln in a converted storage room, and a glaze mixing station along an interior wall. The room has a ceiling exhaust fan but no local duct at the mixing table. Over two weeks you notice fine gray dust on shelves, students dry-sweeping the floor at cleanup, and a shared bag of powdered glaze labeled only “matte base.” Two students have begun mixing glazes without aprons; one eats crackers at the table. The kiln is vented only by cracking the door after firing. District policy requires a chemical inventory and SDS access, but the binder is incomplete. You have a $400 supply budget and a principal who supports safety but worries about parent complaints over “overreacting.”
1. What immediate actions would you take before the next class, and in what order?
Read the worked answer
First, stop the exposure pathways: no food or drink at the mixing table, no dry sweeping, and no student handling of unknown powdered materials. Wet-clean shelves and floors, bag and label the unknown “matte base,” and remove it until identified. Check the SDS binder and inventory; if records are missing, treat the material as hazardous until proven otherwise. Set up a teacher-only or supervised mixing station with aprons, gloves, and a local exhaust fan or move mixing to a ventilated area; the ceiling fan alone is not local exhaust. Do not rely on dust masks as a substitute for ventilation and wet methods. Confirm kiln ventilation and a safe cooling protocol. Then notify the principal factually, in writing, with the steps taken and what remains needed. The order matters: stop exposure first, document second, communicate third.
2. Redesign the glaze unit to reduce exposure while preserving the learning goals of testing, calculation, and surface control.
Read the worked answer
Shift the unit from raw-material mixing to wet or pre-mixed glazes for most students, with teacher-demonstrated weighing and dispersion behind the exhaust. Keep the conceptual goals: students still calculate batch percentages on paper, test line blends on tiles, record firing results, and analyze surface defects. Use slip or underglaze for color study, and schedule a single supervised mixing day for advanced students with PPE and wet cleanup. Replace dry sweeping with wet sponging and a HEPA vacuum if available. Add a short safety curriculum-silica dust, routes of exposure, why aprons and no food matter-and have students inspect the SDS for one material. This preserves inquiry and chemistry while removing unnecessary student exposure.
3. How would you communicate the situation to the principal and to families without being alarmist?
Read the worked answer
I would use a factual, solution-oriented message: what was observed, what is known and unknown, what has been changed immediately, and what support is needed. To the principal, I would cite district chemical-inventory and SDS policy, list the stop-work fixes, and request a local exhaust assessment and replacement of unlabeled materials. To families, I would explain that ceramics involves mineral dusts and that the class is using wet cleanup, closed containers, and supervised mixing; avoid claiming there was a diagnosed health risk. Invite questions and offer the safety rules. The judgment is to be transparent without speculating about harm, and to frame the changes as standard studio practice rather than crisis response.