Mizuno · Golf Balls & Equipment
Mizuno RB 566 Golf Balls
Lower concern golf ball; standard polymer construction without known PFAS.
Mizuno RB 566 uses conventional golf ball materials without public PFAS disclosures or red flags. No independent testing exists, though standard golf ball construction poses minimal PFAS risk.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Synthetic rubber/resin core, surlyn or polyurethane cover
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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.
Microplastics
Surlyn and polyurethane covers degrade with repeated play, UV exposure, and impact stress. Shed microparticles may accumulate in water hazards and turf; ingestion risk to humans is negligible during normal recreational use.
Source, EPA ↗Thermal off-gassing if overheated
Prolonged exposure to temperatures above 160F (71C) may initiate decomposition of polyurethane or synthetic rubber, releasing low-level odorous compounds. This is unlikely in typical use and poses no acute hazard to players.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Heavy metals
No public reports of lead, cadmium, or antimony testing in Mizuno RB 566 covers. Golf ball manufacturers are not subject to toy safety (CPSIA) or food-contact regulations. No recalls or hazard notices exist on record for this product or brand.
Source, FDA ↗Volatile organic compounds (VOCs) off-gassing
Synthetic rubber and polyurethane cores and covers do not emit measurable VOCs during normal storage or use at room temperature. Sealed plastic packaging may retain minor manufacturing odors that dissipate quickly upon opening.
Skin sensitization from cover material contact
Surlyn and polyurethane are widely used in contact sports equipment and do not cause documented allergic reactions or dermatitis in normal handling. Golf balls require no skin contact during play itself.
The full breakdown
What it's made of and why it matters
The RB 566 uses a synthetic rubber or resin core wrapped in a Surlyn or polyurethane cover, a construction standard across modern golf balls. These materials are inert during normal use (striking and flight); they do not leach into skin or contact food. The cover's durability matters mainly for play performance and longevity, not chemical safety. No volatile organic compounds (VOCs) are released during typical handling or storage at room temperature.
The brand's record and disclosure
Mizuno, a major Japanese sports equipment manufacturer, maintains no publicly documented safety recalls or chemical disclosure controversies for golf balls. The brand does not advertise specific certifications for materials safety (e.g., heavy metal testing or flame retardant avoidance) in this product category. Silence on PFAS use in golf ball coatings is standard across the industry; no manufacturer has disclosed intentional PFAS addition to recreational golf balls to date.
How it compares in its category
Golf balls across all brands (Titleist, Callaway, TaylorMade, Bridgestone) use chemically similar core and cover systems. The RB 566 sits in the mid-tier performance segment with no material advantage or disadvantage relative to peers. Unlike footwear or textiles, golf balls incur no skin contact during play and no ingestion risk, placing them in a lower-hazard category than most consumer products.
If you buy it
Store at room temperature in a dry location; extreme heat (above 140F/60C) may degrade the cover over years of storage but poses no acute chemical risk. Inspect covers for scuffs or cracks before play; damaged balls should be retired for performance reasons, not safety. Hand-washing after play removes dirt but is optional for safety. Normal use carries no documented health risk.
What we don’t know
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Mizuno has made none
Formulations change between production runs, so check the current label. How we grade.
More golf balls & equipment 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.