Hylea
Sealants & Caulk
Products used to fill gaps and joints around windows, doors, tubs, and other building elements. Options include silicone, acrylic latex, polyurethane, and hybrid polymers with varying chemical concerns.
Why It Matters
Polyurethane sealants contain asthmagenic isocyanates. Silicone sealants may contain cyclosiloxanes (D4) and organotin catalysts. Phthalate plasticizers migrate from many sealant types.
Chemicals of Concern in This Product
Isocyanates (MDI, TDI)
A family of highly reactive chemicals used to make polyurethane foams, coatings, and adhesives....
Phthalates
A group of chemicals used to make plastics more flexible and harder to break. Also used as...
Cyclosiloxanes (D4, D5, D6)
A group of cyclic silicone compounds used in personal care products and as carriers in...
Organotin Compounds
A class of organic compounds containing tin, used as stabilizers in PVC, catalysts in silicone...
Ingredient Red Flags
Watch for these on ingredient labels:
- Spray polyurethane foam
- Two-part polyurethane sealants
- Strong solvent odor
- 'Mildew-resistant' (may contain arsenic)
- High-VOC formulations
What to Look For
- ✓Acrylic latex caulk (low VOC, water-based)
- ✓Titanium-catalyzed silicone (lower toxicity)
- ✓Pre-formed foam tape instead of spray foam
- ✓Phthalate-free plasticizers
Finding Safer Options
Low-VOC acrylic latex caulk, siliconized latex caulk, pre-compressed foam tape. Avoid spray foam and two-part polyurethane sealants.
Certifications to Look For
Other Products in This Category
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Flexible flooring products including vinyl (PVC), linoleum, rubber, and...
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Wall and ceiling coatings for indoor spaces. Modern latex/acrylic paints...
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