{"hq_id":"hq-p-hom-000245","name":"Caulk and Sealant Replacement (Silicone vs Polyurethane, Mold, VOC)","category":{"primary":"household","secondary":"renovation","tags":["caulk","sealant","silicone","polyurethane","mold","VOC","bathroom"]},"product_tier":"HOM","overall_risk_level":"low","description":"Old caulk harbors mold that penetrates below the surface — must be removed, not cleaned over. Silicone caulk: acetic acid off-gassing during cure. Polyurethane: contains MDI (skin sensitizer, gloves required). Latex/acrylic: lowest VOC, shortest lifespan. All caulks off-gas during cure: 24-72 hours for silicone, 7-14 days for polyurethane.","synthesis":{"derived_risk_level":"moderate","synthesis_confidence":0.715,"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":"asthmatics, MDI-sensitized individuals","overall_risk":"low","primary_concerns":["Mold penetration below old caulk (cannot clean, must remove)","Acetic acid off-gassing from silicone (eye/respiratory irritation)","Polyurethane caulk: MDI skin sensitization risk","Enclosed bathroom amplifies exposure"],"exposure_routes":"Inhalation (acetic acid, mold spores, VOCs); dermal (uncured polyurethane)"},"exposure":{"routes":["inhalation","dermal"],"contact_types":["inhalation","skin_brief"],"users":["adult"],"duration":"hours","frequency":"event-based","scenarios":["Acetic acid off-gassing from silicone during cure","Mold spore aerosolization during old caulk removal","Polyurethane caulk: MDI skin sensitization from uncured product","Low-level VOC off-gassing during cure period"],"notes":"Neutral-cure silicone: less irritating than acetic-acid-cure. Polyurethane (Sika, Loctite PL): excellent adhesion but MDI content = gloves mandatory. After removing moldy caulk: clean substrate with hydrogen peroxide, dry completely before re-caulking."},"consumer_guidance":{"usage_warning":"Remove all old caulk completely — do not caulk over mold. Clean substrate with hydrogen peroxide. Ventilate bathroom during and for 24-48 hours after. Polyurethane caulk: wear nitrile gloves.","safer_alternatives":["Neutral-cure silicone (lower off-gassing)","Latex/acrylic caulk (lowest VOC, paintable)","Hydrogen peroxide for substrate cleaning after mold removal","Ventilate during cure period"]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"No specific federal regulation for residential caulk","citation":"N/A","requirements":"SCAQMD Rule 1168: sealant VOC limits for commercial (250 g/L). No federal residential limit.","compliance_status":null,"effective_date":null,"enforcing_agency":"State air quality districts","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 caulk: regular trash. Uncured polyurethane: hazardous waste.","hazardous_waste":false,"expected_lifespan":"5-20_years"},"formulation":{"form":"varies","key_ingredients":[],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-org-000011","compound_name":null,"role":"contaminant","typical_concentration":null},{"hq_id":"hq-c-org-000047","compound_name":null,"role":"solvent","typical_concentration":null}],"identifiers":{"common_names":["caulk and sealant replacement (silicone vs polyurethane, mold, voc)"],"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":"No specific federal regulation for residential caulk (N/A)","jurisdiction":"USA","citation":"N/A","id":"src_f3a93762"},{"id":"iarc_100f_form","type":"regulatory","title":"IARC Monographs Volume 100F: Formaldehyde","year":2012,"inherited_from_compound":"hq-c-org-000011"},{"id":"epa_form_iris","type":"regulatory","title":"US EPA IRIS Assessment: Formaldehyde (draft)","year":2010,"inherited_from_compound":"hq-c-org-000011"},{"id":"iarc_71_toluene","type":"regulatory","title":"IARC Monographs Volume 71: Toluene","year":1999,"inherited_from_compound":"hq-c-org-000047"},{"id":"atsdr_toluene","type":"report","title":"ATSDR Toxicological Profile for Toluene","year":2017,"inherited_from_compound":"hq-c-org-000047"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-25","timestamp":"2026-05-14T01:26:27.660Z"}}