Sunbrella · Outdoor Furniture Cushion Protectants
RST Brands Castelli Outdoor Sunbrella Cushion Cover Set of 2
High PFAS risk. Sunbrella uses fluorochemical water-repellent coating.
Sunbrella cushion covers use treated acrylic with water and stain resistance. Sunbrella historically uses fluorochemical durable water repellents, a common PFAS source.
The better-graded swap
Blazing Needles
74 in by 19 in Outdoor Solid Polyester Tufted Chaise Lounge Cushion
85/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Sunbrella acrylic fabric with water-repellent coating treatment
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What RST Brands Castelli Outdoor Cover Set is made of, ingredients and materials
These cushion covers are Sunbrella acrylic fabric, a solution-dyed synthetic that resists fading and mildew. The key concern is the water-repellent coating (water-repellent coating) finish applied to achieve water resistance. Sunbrella's water-repellent coating formulations historically relied on fluorochemical compounds (PFAS), which persist in the environment and human tissue. The acrylic fiber itself is stable and does not degrade into microplastics under normal outdoor use, though abrasion over years may generate fine particles.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Waterproof / stain-resistant treatment
Water-repellent coating treatments have historically used PFAS.
PFAS
Sunbrella's standard water-repellent finish almost certainly contains PFAS "forever chemicals". These compounds migrate into soil, groundwater, and skin contact over time, and are bioaccumulative. No public statement from the brand confirms PFAS-free status.
Source, ATSDR ↗Volatile organic compounds (VOCs) off-gassing
Acrylic fabrics and water-repellent coating finishes may release low levels of VOCs, particularly when new or when exposed to heat. Outdoor storage and air circulation minimize exposure; indoor use in poorly ventilated spaces poses slightly higher inhalation risk.
Microfiber shedding
Acrylic outdoor fabrics gradually shed fine fibers when abraded by contact, friction, or weathering. Shed fibers may enter soil and waterways; direct inhalation during handling is unlikely at low levels but possible with intensive or prolonged contact.
Coating degradation and leaching
The water-repellent coating finish degrades over time with UV exposure, water contact, and cleaning. As the coating breaks down, fluorochemical residues may leach more readily into soil or water, or become re-suspended during washing.
What’s reassuring
Lead
Sunbrella acrylic is solution-dyed (pigment mixed into fiber before extrusion), a process that does not require heavy metal mordants. No recalls or warnings for heavy metal contamination have been documented for this product line.
Source, ATSDR ↗How is this PFAS grade calculated?
The brand's record and disclosure
Sunbrella is owned by Glen Raven and has not publicly disclosed whether it has phased away from fluorochemical water-repellent coating treatments in favor of PFAS-free alternatives. The brand maintains strong quality certifications (solution-dyed, colorfastness) but remains silent on PFAS status despite industry-wide awareness of these concerns since approximately 2015. No formal recalls or health warnings have been issued for Sunbrella cushion covers. This silence is notable given that some competing outdoor fabric brands have made explicit commitments to PFAS-free water repellency.
How it compares in its category
Sunbrella is the market leader in performance outdoor upholstery and generally ranks well for durability, colorfastness, and resistance to mildew and UV damage. However, its water-repellent coating approach places it in the higher-risk segment for PFAS exposure compared to brands that have explicitly switched to fluorocarbon-free or paraffin-based repellents. Among comparable premium acrylic outdoor cushion covers, Sunbrella trades some chemical transparency for proven longevity and stain resistance. Budget alternatives using untreated polyester or cotton offer lower PFAS risk but reduced water and soil resistance.
If you buy it
Store covers indoors or under waterproof storage bags during off-season to minimize rain exposure and water-repellent coating leaching into soil or runoff. Clean with mild soap and water rather than harsh detergents, which can accelerate coating degradation and increase microfiber release. Inspect seams and backing annually; replacement is warranted if stitching deteriorates or fabric becomes stiff or discolored, typically after 5-7 years of heavy use. Do not machine wash or dry clean; hand wash only and air dry away from direct heat, as high temperatures can accelerate off-gassing of residual fluorochemicals.
What is not known about PFAS in this product?
- Basis
- Model estimate, 45% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Sunbrella has made none
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to RST Brands Castelli Outdoor Sunbrella Cushion Cover Set of 2?
Blazing Needles
74 in by 19 in Outdoor Solid Polyester Tufted Chaise Lounge Cushion
- Polyester fill with polyester cover
- We found no PFAS statement from the brand
- Azo dyes in polyester textiles
2 hazards checked on this product, all on its full breakdown.
- mineral oil, argan oil blend
- We found no PFAS statement from the brand
- Fragrance allergens and undisclosed components
4 hazards checked on this product, all on its full breakdown.
- 100% cotton canvas
- Azo dyes and dye contamination
3 hazards checked on this product, all on its full breakdown.
More outdoor furniture cushion protectants grades
How we score, every product runs through the same public 0-100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.