{"hq_id":"hq-p-hom-000137","name":"Latex Caulk / Painter's Caulk (Acrylic Latex)","category":{"primary":"household","secondary":"sealants","tags":["latex caulk","acrylic caulk","painter's caulk","MIT","BIT","contact allergen","low VOC"]},"product_tier":"HOM","overall_risk_level":"moderate","description":"Water-based acrylic latex caulk used for sealing gaps around windows, doors, trim, and baseboards before painting. Low VOC compared to silicone or polyurethane sealants. Contains acrylic latex polymer, calcium carbonate filler, titanium dioxide pigment, propylene glycol (coalescent), and biocide preservatives — typically MIT (methylisothiazolinone) or BIT (benzisothiazolinone), which are potent contact allergens. MIT was named Contact Allergen of the Year 2013 by ACDS. Despite 'low VOC' marketing, the preservative allergens represent the primary health concern — especially for painters and construction workers with repeated skin exposure.","synthesis":{"derived_risk_level":"negligible","synthesis_confidence":0.543,"synthesis_method":"compound_composition","context_used":"human_adult","context_source":"product_users","exposure_modifier":1.1,"vulnerability_escalated":false,"escalation_reason":null,"compounds_resolved":4,"compounds_total":4,"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":{"critical_concern":"Despite 'low VOC' marketing, latex caulk contains MIT and/or BIT isothiazolinone preservatives — among the most potent contact allergens known. MIT was Contact Allergen of the Year 2013. The common practice of finger-smoothing wet caulk delivers direct skin contact with these allergens. Professional painters and construction workers are at highest risk due to repeated exposure. Once sensitized, even trace MIT/BIT contact causes allergic contact dermatitis.","key_hazards":["MIT (Contact Allergen of the Year 2013) — causes allergic contact dermatitis at ppm concentrations","BIT — emerging contact allergen with cross-reactivity to MIT","Finger-smoothing wet caulk = direct skin contact with preservative allergens","Occupational sensitization in painters and construction workers"],"overall_risk":"low-moderate","primary_concerns":["Contact allergen sensitization (MIT/BIT)","Occupational dermatitis"],"sensitive_populations":"painters and construction workers (repeated exposure), individuals with contact dermatitis or isothiazolinone allergy","exposure_routes":"dermal (primary — finger smoothing), inhalation (secondary — low VOC)"},"exposure":{"routes":["dermal","inhalation"],"contact_types":["dermal","inhalation"],"users":["adult"],"duration":"hours","frequency":"occasional","scenarios":["Applying caulk with bare hands (finger-smoothing technique is common)","Repeated occupational exposure for painters and construction workers","Low-level VOC off-gassing during drying (hours)","Sanding dried caulk generates dust (TiO2, CaCO3)"],"notes":"Primary concern is dermal sensitization from MIT/BIT during application — finger-smoothing wet caulk is extremely common and delivers direct skin contact with preservative allergens."},"consumer_guidance":{"red_flags":[{"indicator":"Smoothing wet caulk with bare fingers","meaning":"Direct skin contact with MIT/BIT preservative allergens","action":"ALWAYS wear nitrile gloves; use a caulk finishing tool"}],"green_flags":[{"indicator":"Labeled 'isothiazolinone-free' or 'MIT-free'","meaning":"Eliminates the primary allergen concern","verification":"Check SDS for absence of MIT, BIT, and CMIT"},{"indicator":"Low VOC (<50 g/L)","meaning":"Minimal solvent off-gassing","verification":"VOC content typically printed on label"}],"what_to_ask":[{"question":"Does this caulk contain isothiazolinone preservatives (MIT/BIT)?","why_it_matters":"MIT is one of the most potent contact allergens — request SDS from manufacturer if not on label"}],"alternatives":[{"name":"MIT/BIT-free acrylic latex caulk","notes":"Some manufacturers now offer isothiazolinone-free formulations"},{"name":"Silicone sealant (for non-paintable applications)","notes":"No water-based preservative system needed; not paintable"}],"notes":null},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"OSHA HazCom (29 CFR 1910.1200)","citation":null,"requirements":"SDS required. MIT/BIT must be listed if above reporting threshold.","compliance_status":null,"effective_date":null,"enforcing_agency":"OSHA","penalties":null,"source_ref":null},{"jurisdiction":"EU","regulation":"EU CLP Regulation (EC) No 1272/2008","citation":null,"requirements":"MIT classified as skin sensitizer Cat 1A (H317). Must be labeled on products above 15 ppm. EU restricted MIT to 15 ppm in leave-on products (cosmetics); no specific limit in building products.","compliance_status":null,"effective_date":null,"enforcing_agency":null,"penalties":null,"source_ref":null},{"jurisdiction":"USA — Multi-state","regulation":"VOC Content Regulations (OTC, CARB, LADCO)","citation":null,"requirements":"Caulk/sealant VOC content limits (typically 50-100 g/L). Acrylic latex caulk generally complies easily.","compliance_status":null,"effective_date":null,"enforcing_agency":null,"penalties":null,"source_ref":null}],"certifications":[],"labeling":{"required_disclosures":["SDS listing of MIT/BIT if above threshold","VOC content"],"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":["preservative type"],"estimated_count":null,"known_concerns":"MIT/BIT often listed only on SDS, not on consumer tube label","notes":null},"notes":null},"recalls":[],"regulatory_gap":"MIT/BIT concentrations below SDS reporting thresholds may not be disclosed on consumer packaging. EU restricts MIT in cosmetics but not in building products. Consumer label does not warn about contact allergen risk from finger-smoothing.","notes":null},"lifecycle":{"recyclable":false,"disposal_guidance":"Dried caulk is non-hazardous landfill waste. Allow tubes to dry before disposal.","hazardous_waste":false,"expected_lifespan":"5-10_years"},"formulation":{"form":"paste_sealant","key_ingredients":[{"hq_id":null,"name":"Acrylic latex polymer","role":"binder","concentration_pct":"30-45"},{"hq_id":"hq-c-org-000570","name":"Calcium carbonate (CaCO3)","role":"filler","concentration_pct":"25-40"},{"hq_id":"hq-c-ino-000080","name":"Titanium dioxide (TiO2)","role":"pigment","concentration_pct":"1-5"},{"hq_id":"hq-c-org-000094","name":"Propylene glycol","role":"coalescent_solvent","concentration_pct":"1-3"},{"hq_id":"hq-c-org-000443","name":"Methylisothiazolinone (MIT)","role":"in-can_preservative","concentration_pct":"0.001-0.01"},{"hq_id":null,"name":"Benzisothiazolinone (BIT)","role":"in-can_preservative","concentration_pct":"0.001-0.01"}],"certifications":[]},"materials":{"common":[],"concerning":[{"material_id":null,"concern":"MIT (methylisothiazolinone) — Contact Allergen of the Year 2013 (ACDS); potent skin sensitizer; causes allergic contact dermatitis at very low concentrations","compounds_of_concern":["Methylisothiazolinone (MIT)"],"source_refs":[]},{"material_id":null,"concern":"BIT (benzisothiazolinone) — emerging contact allergen; cross-reactivity with MIT","compounds_of_concern":["Benzisothiazolinone (BIT)"],"source_refs":[]}],"preferred":[{"material_id":"hq-m-chm-000005","material_name":"MIT/BIT-free acrylic latex caulk","why_preferred":"Eliminates contact allergen exposure; some manufacturers now offer isothiazolinone-free formulations","tradeoffs":"Shorter shelf life; may require refrigeration","hq_id":"hq-m-chm-000005"},{"material_id":null,"material_name":"Silicone-acrylic hybrid sealant","why_preferred":"Better durability than pure acrylic; may use different preservative system","tradeoffs":"Not paintable (silicone component); higher cost"}]},"compound_composition":[{"hq_id":"hq-c-org-000570","compound_name":"Calcium carbonate","role":"filler","typical_concentration":null},{"hq_id":"hq-c-ino-000080","compound_name":"Titanium dioxide (TiO2)","role":"pigment","typical_concentration":null},{"hq_id":"hq-c-org-000094","compound_name":"Propylene glycol","role":"coalescent","typical_concentration":null},{"hq_id":"hq-c-org-000443","compound_name":"Methylisothiazolinone (MIT)","role":"preservative","typical_concentration":null}],"identifiers":{"common_names":["latex caulk","painter's caulk","acrylic latex caulk","interior caulk","paintable caulk"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[{"brand":"Generic Mass-Market Brand A","manufacturer":"Consumer Products Corporation","market_position":"mass_market","notable":"Market-leading painter's caulk"},{"brand":"Generic Mass-Market Brand B","manufacturer":"Consumer Goods Ltd","market_position":"mass_market","notable":"Budget latex caulk"},{"brand":"Premium Brand A","manufacturer":"Premium Sealants Inc","market_position":"premium","notable":"Professional-grade paintable 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":"2026-03-24"},{"type":"regulation","title":"OSHA HazCom (29 CFR 1910.1200)","jurisdiction":"USA","id":"src_5bad7ceb"},{"type":"regulation","title":"EU CLP Regulation (EC) No 1272/2008","jurisdiction":"EU","id":"src_0f73e4b5"},{"type":"regulation","title":"VOC Content Regulations (OTC, CARB, LADCO)","jurisdiction":"USA — Multi-state","id":"src_49ffaead"},{"id":"caco3_regulatory_2020","type":"regulatory","title":"Calcium Carbonate CaCO3 Limestone Calcite Chalk Marble; Essential Mineral RDA 1000-1200 mg/day UL 2500 mg/day; Hydroxyapatite Bone Teeth 99% Body Ca; Supplement Antacid E170 Food Additive Excipient; Milk-Alkali Syndrome Hypercalcemia Kidney Stone WHI Trial; Bolland Cardiovascular Risk Meta-Analysis Disputed; Drug Interactions Fluoroquinolone Tetracycline Iron Separation 2h; Cement Calcination 4% Global CO2; Ocean Acidification CaCO3 Saturation Coral Bleaching; IARC Not Evaluated Not Carcinogen","year":2020,"inherited_from_compound":"hq-c-org-000570"},{"id":"iarc_tio2_vol93_2010","type":"regulatory","title":"IARC Group 2B Titanium Dioxide Vol 93 2010; Lung Overload Rat Bronchioloalveolar Carcinoma Particle Mechanism; EFSA 2021 No Longer Safe Food Additive Genotoxicity Nanoparticle; EU E171 Ban August 2022 Regulation EU 2022/63; France Domestic Ban January 2020 Precautionary; Sunscreen Mineral Physical UV TiO2 Safe Topical Negligible Skin Penetration SCCS; 7 Million Tonnes/Year Global Production White Pigment; Sulfate Chloride Process Rutile Anatase; Photocatalytic OH Radical UV Sunlit Water Algae Daphnia Fish; TiO2 Nanoparticle WWTP Sludge Aggregation Soil; IARC Group 2B Inhaled Only Not Oral","year":2010,"inherited_from_compound":"hq-c-ino-000080"},{"id":"fda_pg_cat_food_ban","type":"regulatory","title":"US FDA: Propylene Glycol in Animal Food — Final Rule Prohibiting Use in Cat Food (21 CFR 582.4666) and GRAS Status for Dog Food","year":1996,"inherited_from_compound":"hq-c-org-000094"},{"id":"aspca_apcc_pg","type":"veterinary","title":"ASPCA Animal Poison Control Center: Propylene Glycol — Heinz Body Anemia Risk in Cats and Species Differences in Erythrocyte Sensitivity","year":2022,"inherited_from_compound":"hq-c-org-000094"},{"id":"epa_mit_2000","type":"regulatory","title":"US EPA Methylisothiazolinone: Group D Not Classifiable; FIFRA Pesticide Registration; Strong Sensitizer EC3 0.5–1%; Paraben-Free Preservative Epidemic; Wet Wipes Sensitization; In Vitro Neurotoxicity; Industrial Paint and Adhesive Biocide","year":2000,"inherited_from_compound":"hq-c-org-000443"},{"id":"efsa_sccs_mit_2016","type":"regulatory","title":"EFSA/SCCS Methylisothiazolinone: EU Leave-On Ban Commission Regulation 2016/1198; SCCS 2014 Safety Assessment; Rinse-Off Maximum 0.0015%; Pediatric Wet Wipes Dermatitis Epidemic; Diaper Area ACD; Aquatic LC50 0.1–2 mg/L","year":2016,"inherited_from_compound":"hq-c-org-000443"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-24","timestamp":"2026-05-14T01:28:35.198Z"}}