{"hq_id":"hq-p-hom-000176","name":"Fiberglass Insulation (Respirable Glass Fibers)","category":{"primary":"household","secondary":"construction","tags":["fiberglass","insulation","glass fiber","formaldehyde","binder","IARC 2B","itching"]},"product_tier":"HOM","overall_risk_level":"moderate","description":"Fiberglass batt, blown, and rigid board insulation made from spun glass fibers bonded with phenol-formaldehyde or acrylic resin. Respirable glass fibers (<3 μm diameter) are IARC Group 2B (possibly carcinogenic — glass wool). Larger fibers cause mechanical skin and respiratory irritation. Formaldehyde binder off-gasses from new fiberglass insulation, contributing to indoor formaldehyde levels. Formaldehyde-free fiberglass (Owens Corning EcoTouch, Knauf Ecose) uses bio-based binders.","synthesis":{"derived_risk_level":"moderate","synthesis_confidence":0.736,"synthesis_method":"compound_composition","context_used":"human_adult","context_source":"product_users","exposure_modifier":0.77,"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":"installers, DIY renovators, attic-access workers","overall_risk":"moderate","primary_concerns":["Respirable glass fibers: IARC Group 2B (glass wool)","Phenol-formaldehyde binder off-gassing into living space","Mechanical skin and respiratory irritation during handling","DIY installation without proper PPE (common)"],"exposure_routes":"Inhalation of fibers and formaldehyde; dermal irritation from fiber contact"},"exposure":{"routes":["inhalation","dermal"],"contact_types":["inhalation","skin_brief"],"users":["occupational","adult"],"duration":"hours","frequency":"rarely","scenarios":["Installation: fiber and formaldehyde exposure during handling and cutting","Attic access: disturbing existing fiberglass releases fibers and dust","DIY insulation without respiratory protection","Post-installation formaldehyde off-gassing from binder into living space"],"notes":"IARC 2002: glass wool fibers classified Group 2B (possibly carcinogenic). NTP 2011: removed glass wool from Report on Carcinogens (insufficient evidence). OSHA PEL: 1 fiber/cc (respirable). Formaldehyde-free fiberglass eliminates binder off-gassing. Mineral wool (Rockwool) and cellulose are alternatives with different exposure profiles. Long, thin glass fibers (bio-persistent) are more concerning than short, thick fibers."},"consumer_guidance":{"usage_warning":"Wear N95 respirator, long sleeves, gloves, and safety goggles during any fiberglass handling. Choose formaldehyde-free fiberglass (EcoTouch, Ecose). Seal attic access point to prevent fiber migration into living space. Consider mineral wool or cellulose as alternatives.","safer_alternatives":["Formaldehyde-free fiberglass (Owens Corning EcoTouch, Knauf Ecose)","Mineral wool batts (Rockwool — naturally fire-resistant, no formaldehyde)","Cellulose insulation (recycled paper, borate-treated)","Sheep wool insulation (natural, breathable, no synthetic binder)"],"red_flags":[{"indicator":"Exposure without required PPE or engineering controls","meaning":"Risk of acute injury or chronic disease.","action":"Follow OSHA requirements and manufacturer PPE recommendations."}],"green_flags":[{"indicator":"OSHA-compliant engineering controls and PPE in use","meaning":"Exposure controlled to below permissible limits.","verification":"Check for OSHA compliance documentation and exposure monitoring records."}],"what_to_ask":[{"question":"What are the OSHA-required exposure controls for this product/process?","why_it_matters":"OSHA PELs and engineering controls are legally mandated.","good_answer":"Specific PEL, engineering controls, and PPE identified and implemented.","bad_answer":"No awareness of OSHA requirements."}],"alternatives":[{"name":"Formaldehyde-free fiberglass","notes":"Owens Corning EcoTouch, Knauf Ecose"},{"name":"Mineral wool batts","notes":"Rockwool — naturally fire-resistant, no formaldehyde"},{"name":"Cellulose insulation","notes":"recycled paper, borate-treated"}]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"OSHA PEL for Fibers","citation":"29 CFR 1910.1000","requirements":"Fibrous glass: 1 fiber/cc TWA (respirable). General nuisance dust: 15 mg/m3 total, 5 mg/m3 respirable.","compliance_status":null,"effective_date":null,"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":"Construction waste. Wear N95 during removal/disposal. Bag in heavy plastic.","hazardous_waste":false,"expected_lifespan":"50+_years"},"formulation":{"form":"varies","key_ingredients":[{"hq_id":"hq-c-org-000011","name":"Formaldehyde","role":"binder","concentration_pct":"2-5"},{"hq_id":"hq-c-ino-000008","name":"Crystalline silica (quartz)","role":"fiber_class_ref","concentration_pct":"90-95"}],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-org-000011","compound_name":null,"role":"binder","typical_concentration":"2-5%"},{"hq_id":"hq-c-ino-000008","compound_name":null,"role":"fiber_class_ref","typical_concentration":"90-95%"}],"identifiers":{"common_names":["fiberglass insulation (respirable glass fibers)"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[{"brand":"SC Johnson","manufacturer":"SC Johnson","market_position":"mass_market","notable":"Household product conglomerate"},{"brand":"Clorox","manufacturer":"Clorox","market_position":"mass_market","notable":"Household cleaning market leader"},{"brand":"3M","manufacturer":"3M","market_position":"mass_market","notable":"Home safety and maintenance products"}],"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 PEL for Fibers (29 CFR 1910.1000)","jurisdiction":"USA","citation":"29 CFR 1910.1000","id":"src_5f96b175"},{"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_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":"monograph","title":"International Agency for Research on Cancer (IARC)","jurisdiction":"International","id":"src_d9ebbaf2","extraction":"description_reference"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-25","timestamp":"2026-05-14T01:25:22.098Z"}}