{"hq_id":"hq-p-spe-000098","name":"Pottery and Ceramics Glaze (Lead, Silica Dust, Kiln Fumes)","category":{"primary":"specialty","secondary":"art","tags":["pottery","ceramics","glaze","lead","silica","kiln","clay","dust","food safe"]},"product_tier":"SPE","overall_risk_level":"moderate_to_high","description":"Pottery and ceramics involving three exposure pathways: silica dust from clay handling/mixing (silicosis risk), lead in some glazes (especially imported and vintage), and kiln fumes (CO, SO2, metal fumes during firing). Lead-glazed ware used for food: lead leaches into acidic food. FDA limits: 0.5 ppm lead for flatware, 2.0 ppm for small hollowware. Vintage and imported pottery frequently exceeds FDA lead limits. Lead-free glazes are standard in professional ceramic supply but hobbyist/imported glazes may contain lead.","synthesis":{"derived_risk_level":"moderate_to_high","synthesis_confidence":0.729,"synthesis_method":"compound_composition","context_used":"human_adult","context_source":"product_users","exposure_modifier":1.1,"vulnerability_escalated":false,"escalation_reason":null,"compounds_resolved":2,"compounds_total":2,"synthesis_date":"2026-05-09","synthesis_version":"1.2.0","methodology_note":"exposure_modifier and adjusted_magnitude are computed from ALETHEIA-calibrated heuristics (route × duration × frequency multipliers, clamped to [0.5, 1.4]). Multipliers are directionally informed by EPA Exposure Factors Handbook (2011) and CalEPA OEHHA but are not regulatory consensus. See /api/methodology for full disclosure."},"hazard_summary":{"sensitive_populations":"hobby potters, children using handmade pottery for food","overall_risk":"moderate_to_high","primary_concerns":["Silica dust from dry clay: silicosis (incurable lung disease)","Lead in glazes: leaches into acidic food from finished pottery","Kiln fumes without ventilation: CO, SO2, metal vapors","Imported/vintage pottery frequently exceeds FDA lead limits"],"exposure_routes":"Inhalation (silica dust, kiln fumes); oral (lead-glazed food ware); dermal (glaze handling)"},"exposure":{"routes":["inhalation","oral","dermal"],"contact_types":["inhalation","oral_direct","skin_brief"],"users":["adult"],"duration":"hours","frequency":"weekly","scenarios":["Silica dust during clay mixing, wedging, sanding greenware","Lead glaze application: dermal and ingestion (hand-to-mouth)","Kiln firing: CO, SO2, metal fumes (ventilation required)","Eating/drinking from lead-glazed pottery: acidic food leaching"],"notes":"Silicosis from ceramic clay dust is a documented occupational disease in potters. OSHA silica PEL: 50 μg/m³. Wet methods dramatically reduce silica dust. Lead-free glazes (Amaco, Laguna, Duncan) are readily available. Test any pottery intended for food use with home lead test kit. Imported and vintage pottery: assume lead until tested. Kiln ventilation: downdraft vent (Vent-a-Kiln, Skutt EnviroVent) is essential."},"consumer_guidance":{"usage_warning":"Use wet methods for all clay work (dramatically reduces silica dust). Use ONLY lead-free glazes from professional suppliers. Test any pottery for food use with home lead test kit. Install kiln ventilation (downdraft vent). Wear N95 during dry clay processes. Never eat/drink from untested handmade or imported pottery.","safer_alternatives":["Lead-free glazes from professional suppliers (Amaco, Laguna, Duncan)","Wet clay methods (reduces silica dust 90%+)","Kiln downdraft ventilation (Vent-a-Kiln, Skutt EnviroVent)","Home lead test kit for food-use pottery ($15-20)"],"red_flags":[{"indicator":"Working without ventilation or respiratory protection","meaning":"Chemical exposure at hobby level can cause occupational-grade health effects.","action":"Use ventilation and PPE appropriate to the specific hazard."}],"green_flags":[{"indicator":"Using appropriate PPE and ventilation for the specific task","meaning":"Exposure controlled to safe levels.","verification":"Match PPE to specific hazard (N95 for dust, organic vapor for solvents, supplied air for isocyanate)."}],"what_to_ask":[{"question":"What are the specific chemical hazards of this hobby material?","why_it_matters":"Hobby exposures lack occupational protections but cause the same health effects.","good_answer":"SDS available, specific PPE identified, ventilation plan in place.","bad_answer":"No hazard awareness or PPE use."}],"alternatives":[{"name":"Lead-free glazes from professional suppliers","notes":"Amaco, Laguna, Duncan"},{"name":"Wet clay methods","notes":"reduces silica dust 90%+"},{"name":"Kiln downdraft ventilation","notes":"Vent-a-Kiln, Skutt EnviroVent"}]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"FDA Lead in Ceramic Ware (CPG 7117.07)","citation":"CPG 7117.07","requirements":"Lead limits: flatware 0.5 ppm, small hollowware 2.0 ppm, large hollowware 1.0 ppm, cups/mugs 0.5 ppm.","compliance_status":null,"effective_date":null,"enforcing_agency":"FDA","penalties":null,"source_ref":null}],"certifications":[],"labeling":{"required_disclosures":[],"prop65_warning":{"required":null,"chemicals":[],"endpoint":null,"notes":null},"ghs_labeling":{"required":null,"signal_word":null,"pictograms":[],"hazard_statements":[],"notes":null},"hidden_ingredients":{"trade_secret_protected":null,"categories_hidden":[],"estimated_count":null,"known_concerns":null,"notes":null},"notes":null},"recalls":[],"regulatory_gap":null,"notes":null},"lifecycle":{"recyclable":false,"disposal_guidance":"Unfired clay: reusable. Fired ceramics: regular waste. Glaze chemicals: per SDS.","hazardous_waste":false,"expected_lifespan":"varies"},"formulation":{"form":"varies","key_ingredients":[{"hq_id":"hq-c-ino-000001","name":"Lead (Pb)","role":"glaze_component","concentration_pct":"varies"},{"hq_id":"hq-c-ino-000008","name":"Crystalline silica (quartz)","role":"clay_dust","concentration_pct":"20-60 of dry clay"}],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-ino-000001","compound_name":null,"role":"glaze_component","typical_concentration":"varies"},{"hq_id":"hq-c-ino-000008","compound_name":null,"role":"clay_dust","typical_concentration":"20-60% of dry clay"}],"identifiers":{"common_names":["pottery and ceramics glaze (lead, silica dust, kiln fumes)"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[{"brand":"Federal Premium","manufacturer":"Vista Outdoor","market_position":"mass_market","notable":"Leading ammunition brand"},{"brand":"CCI/Speer","manufacturer":"Vista Outdoor","market_position":"mass_market","notable":"Popular ammunition manufacturer"},{"brand":"Fiocchi","manufacturer":"Fiocchi Munizioni","market_position":"premium","notable":"Premium ammunition brand"}],"brand_examples_disclaimer":"Representative branded products of this category. Concerning ingredients listed in materials.concerning[] apply to the category, not necessarily to every named brand. Specific formulations vary by SKU and may have changed since this record was written; consult the brand's current ingredient label before drawing brand-level conclusions.","sources":[{"type":"expert_curation","name":"ALETHEIA Safety Database","date":"2026-03-25"},{"type":"regulation","title":"FDA Lead in Ceramic Ware (CPG 7117.07)","jurisdiction":"USA","citation":"CPG 7117.07","id":"src_50efeb26"},{"id":"src_001","type":"cdc","title":"CDC - Lead Poisoning Prevention","url":"https://www.cdc.gov/lead-prevention/","accessed":"2026-01-13","relevance":"Blood lead reference values, no safe level doctrine","inherited_from_compound":"hq-c-ino-000001"},{"id":"src_002","type":"who","title":"WHO - Lead Poisoning Fact Sheet","url":"https://www.who.int/news-room/fact-sheets/detail/lead-poisoning-and-health","year":2024,"accessed":"2026-01-13","relevance":"Global burden statistics, health effects","inherited_from_compound":"hq-c-ino-000001"},{"id":"iarc_100c_si","type":"regulatory","title":"IARC Monographs Volume 100C: Silica Dust, Crystalline, in the Form of Quartz or Cristobalite — Arsenic, Metals, Fibres, and Dusts","year":2012,"inherited_from_compound":"hq-c-ino-000008"},{"id":"osha_silica","type":"regulatory","title":"OSHA 29 CFR 1910.1053: Occupational Exposure to Respirable Crystalline Silica","year":2016,"inherited_from_compound":"hq-c-ino-000008"},{"type":"regulatory","title":"US Food and Drug Administration (FDA)","jurisdiction":"USA","id":"src_82d1cfcd","extraction":"description_reference"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-25","timestamp":"2026-05-14T01:24:01.048Z"}}