{"hq_id":"hq-p-hom-000215","name":"Tile Grout and Thinset Mortar (Crystalline Silica, Portland Cement Chromate)","category":{"primary":"household","secondary":"renovation","tags":["tile grout","thinset","mortar","silica","Portland cement","chromate","DIY","mixing"]},"product_tier":"HOM","overall_risk_level":"moderate","description":"Tile installation products: thinset mortar (Portland cement + sand + polymers) and grout (Portland cement + sand + pigment). Mixing dry powder generates respirable crystalline silica dust. Portland cement contains hexavalent chromium Cr(VI) as manufacturing byproduct — causes cement dermatitis ('cement burns') with prolonged wet contact. Pre-mixed grout and thinset eliminate dust exposure but cost more. OSHA silica standard applies even to DIY exposure (same health effects regardless of employment status).","synthesis":{"derived_risk_level":"low","synthesis_confidence":0.706,"synthesis_method":"compound_composition","context_used":"human_adult","context_source":"product_users","exposure_modifier":0.77,"vulnerability_escalated":false,"escalation_reason":null,"compounds_resolved":3,"compounds_total":3,"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":"DIY tile installers, professional tile setters","overall_risk":"moderate","primary_concerns":["Crystalline silica dust during dry mix: silicosis risk","Portland cement Cr(VI): cement dermatitis chemical burns (pH 12-13)","DIY installers commonly work without respiratory protection","EU limits Cr(VI) in cement to <2 ppm; US has no equivalent"],"exposure_routes":"Inhalation (mixing dust); dermal (wet cement contact)"},"exposure":{"routes":["inhalation","dermal"],"contact_types":["inhalation","skin_brief"],"users":["adult","occupational"],"duration":"hours","frequency":"rarely","scenarios":["Mixing dry thinset/grout: silica dust generation (most dangerous moment)","Wet cement on skin: Cr(VI) cement dermatitis (chemical burn, pH 12-13)","Grouting: wet contact with cementitious material for extended periods","DIY tile work without respiratory protection (common)"],"notes":"Pre-mixed grout and thinset: eliminate mixing dust entirely (worth the extra cost for DIY). If mixing dry: wear N95, mix outdoors or in very well-ventilated area. Wet cement is pH 12-13 — causes chemical burns with prolonged skin contact. Wear waterproof gloves during grouting. Wash skin immediately if cement contacts skin. EU has reduced Cr(VI) in cement to <2 ppm (Directive 2003/53/EC); US has no equivalent limit."},"consumer_guidance":{"usage_warning":"Use pre-mixed grout and thinset when possible (eliminates dust). If mixing dry: N95 respirator, outdoor or well-ventilated area. Wear waterproof gloves during all grouting and thinset work. Wash skin immediately if wet cement contacts skin. Do not kneel in wet cement/grout without knee protection.","safer_alternatives":["Pre-mixed grout and thinset (zero mixing dust)","Waterproof gloves during all cement work","N95 respirator for any dry mixing","Low-chromate cement (available in EU, limited in US)"],"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":"Pre-mixed grout and thinset","notes":"zero mixing dust"},{"name":"Waterproof gloves during all cement work","notes":"Alternative"},{"name":"N95 respirator for any dry mixing","notes":"Alternative"}]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"OSHA Silica Standard (applies to construction)","citation":"29 CFR 1926.1153","requirements":"PEL 50 μg/m³ TWA. Table 1 specifies controls for mortar mixing.","compliance_status":null,"effective_date":"2016-06-23","enforcing_agency":"OSHA","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":"Cured cement: construction waste. Uncured powder: regular waste (sealed bag).","hazardous_waste":false,"expected_lifespan":"varies"},"formulation":{"form":"varies","key_ingredients":[{"hq_id":"hq-c-ino-000008","name":"Crystalline silica (quartz)","role":"dust_component","concentration_pct":"25-60 of dry mix"},{"hq_id":"hq-c-ino-000043","name":"Hexavalent chromium (Cr(VI))","role":"cement_contaminant","concentration_pct":"1-20 ppm"},{"hq_id":"hq-c-mix-000032","name":"Portland Cement (class)","role":"base_material","concentration_pct":"30-50"}],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-ino-000008","compound_name":null,"role":"dust_component","typical_concentration":"25-60% of dry mix"},{"hq_id":"hq-c-ino-000043","compound_name":null,"role":"cement_contaminant","typical_concentration":"1-20 ppm"},{"hq_id":"hq-c-mix-000032","compound_name":null,"role":"base_material","typical_concentration":"30-50%"}],"identifiers":{"common_names":["tile grout and thinset mortar (crystalline silica, portland cement chromate)"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[{"brand":"DAP","manufacturer":"DAP","market_position":"mass_market","notable":"Leading caulk and sealant brand"},{"brand":"GE Silicone","manufacturer":"Momentive","market_position":"mass_market","notable":"Silicone sealant brand"},{"brand":"Red Devil","manufacturer":"Red Devil","market_position":"mass_market","notable":"Budget caulk and sealant"}],"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":"OSHA Silica Standard (applies to construction) (29 CFR 1926.1153)","jurisdiction":"USA","year":2016,"citation":"29 CFR 1926.1153","id":"src_010b179f"},{"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"},{"id":"iarc_chromium_v100c_2012","type":"regulatory","title":"IARC Monographs Volume 100C: Arsenic, Metals, Fibres and Dusts — Chromium (VI) Compounds Group 1 (Lung Cancer, Nasal/Sinus Cancer), Nickel Compounds Group 1, Beryllium Group 1 (2012)","year":2012,"inherited_from_compound":"hq-c-ino-000043"},{"id":"epa_mcl_inorganics","type":"regulatory","title":"US EPA: National Primary Drinking Water Regulations — Inorganic Chemicals (40 CFR 141.62); Total Chromium MCL 100 μg/L, Barium MCL 2 mg/L, Uranium MCL 30 μg/L, Selenium MCL 50 μg/L, Manganese SMCL 50 μg/L","year":1992,"inherited_from_compound":"hq-c-ino-000043"},{"id":"iarc_portland_cement_1997","type":"regulatory","title":"IARC Monographs Volume 68 1997 Portland Cement Dust Group 3; Alkali Burns pH 11-13 Wet Cement; Cr(VI) Sensitization EU Directive 2003/53/EC <2ppm; Crystalline Silica IARC Group 1 Volume 100C 2012; Cement Dermatitis Occupational; NIOSH Dust Control","year":1997,"inherited_from_compound":"hq-c-mix-000032"},{"type":"regulatory","title":"US Occupational Safety and Health Administration (OSHA)","jurisdiction":"USA","id":"src_ef6d897f","extraction":"description_reference"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-25","timestamp":"2026-05-14T01:27:44.637Z"}}