Okamura · Office Chairs
Okamura Grata Series Nesting Training Chair (Black/Silver)
Lower PFAS concern for a nesting training chair, typical molded plastics and metal frame carry minimal risk.
The Okamura Grata Series uses standard thermoplastic seat construction and aluminum/steel frame with no known nonstick, water-repellent, or stain-resist coatings that typically require PFAS. Okamura makes no PFAS claims and discloses no special treatments.
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Polypropylene (seat/back), aluminum/steel frame
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
furniture is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
The full breakdown
What it's made of and why it matters
The Grata seat and backrest are injection-molded polypropylene (PP), a thermoplastic chosen for durability, lightweight design, and cost-effectiveness in training environments. The frame combines aluminum and steel, materials that do not leach or off-gas under typical office conditions. Polypropylene itself is chemically stable at room temperature and does not contain BPA, phthalates, or plasticizers that migrate into skin contact, the primary chemical risk class for seating plastics.
The brand's record and disclosure
Okamura is a Japanese office furniture manufacturer with a long institutional presence but limited public transparency on chemical compliance details. No major product recalls or contamination incidents appear in safety databases for the Grata line. The brand maintains certifications typical of commercial furniture (ISO, JIS standards) but does not publish detailed restricted substance lists or third-party chemical testing summaries on consumer-facing materials, a gap common among Japanese manufacturers but not a red flag in itself.
How it compares in its category
Training/nesting chairs typically prioritize stackability and durability over ergonomic features, and polypropylene molded seats are the industry standard for this segment. The Grata is comparable to competitors like Hon, Virco, and Steelcase training models in material composition. Okamura's use of solid PP rather than filled or recycled resin variants suggests lower risk of contaminant inheritance, though this is not explicitly marketed.
If you buy it
Store in dry indoor conditions; polypropylene can become brittle in direct UV sunlight over years, though this is not a chemical safety issue. Wipe surfaces with mild soap and water; avoid solvents or harsh cleaners that may degrade the plastic finish. The aluminum frame will naturally oxidize but is food-safe and non-toxic; corrosion is cosmetic unless the chair is exposed to humid or salt-air environments. Monitor the seat for cracks or delamination, which would indicate age-related failure rather than chemical leaching, but should trigger replacement to avoid splinter risk.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Polypropylene degradation and microplastics
Extended UV exposure or mechanical wear on molded PP surfaces can fragment into microplastics, though indoor office use limits this risk significantly. No specific degradation reports exist for the Grata model.
Metal frame corrosion leachates
Aluminum and steel frames are passive and do not leach under normal indoor conditions. Corrosion would be visible (rust or oxidation) long before any chemical risk manifests.
Volatile organic compound (VOC) off-gassing
Injection-molded PP can off-gas trace levels of volatile compounds during the first weeks after manufacturing, particularly if stored in warm conditions. Airing the chair in a well-ventilated space minimizes this; intensity is lower than upholstered seating.
Formaldehyde in adhesives or binders
Solid polypropylene molding does not require formaldehyde-based adhesives; none are expected in this product type. No reports of formaldehyde detection in Okamura seating lines exist.
Heavy metals in plastic colorants
The black/silver variants use standard organic or inorganic pigments typical of commercial-grade injection molding; cadmium and lead are not permitted in modern PP colorants sold in regulated markets, and no contamination incidents are on record for this brand.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
More office chairs 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.