Ninja · Insulated Travel Mugs
SharkNinja 20 oz. To-Go Ninja Cup Blender 731KKU300
No PFAS concerns known; silent on chemical transparency.
Ninja portable blender cup is standard BPA-free plastic with no known PFAS coatings or treatments. No brand disclosure on PFAS; lower concern than nonstick cookware or treated apparel.
Shop Ninja on Amazon →Material
BPA-free plastic (cup/blender housing)
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
Category baseline
other is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
The Ninja 731KKU300 cup and blender housing are made from BPA-free plastic, likely polypropylene (PP) or a similar copolymer common in food-contact blender vessels. BPA-free formulations replaced bisphenol A with other bisphenols (BPS) or alternative polymers, which reduces but does not eliminate endocrine-disrupting concerns for some users; however, polypropylene itself is considered lower-risk than polycarbonate when not heated excessively. The motor housing is separate from the food-contact cup, which reduces direct leaching pathways during blending.
The brand's record and disclosure
SharkNinja does not publicly disclose detailed chemical sourcing or third-party testing for PFAS, phthalates, or heavy metals in their small appliance lines. The company has no major recalls related to leaching or hazardous coatings in their blender product line as of public record. Ninja competes in a market segment where transparency is low across brands; their silence on chemical composition is standard rather than exceptional for the category.
How it compares in its category
Portable blender cups in this price range typically use BPA-free plastic without food-contact metal components, making material profiles similar across Ninja, Vitamix, and store brands. The 731KKU300 design avoids glazed ceramic or enamel coatings that could leach lead or cadmium, and does not use Teflon-type coating or other Teflon-family coating non-stick surfaces. Compared to higher-end blenders with stainless-steel pitchers, this plastic-cup design trades durability for affordability but carries slightly lower heavy-metal contamination risk.
If you buy it
Do not use the blender cup with liquids hotter than 140F (60C) or blend for extended periods at high speed, as heat and mechanical stress can increase microplastic shedding from worn plastic surfaces. Hand wash the cup rather than running it through a dishwasher, which degrades plastic faster. Replace the cup if you notice visible cracks, cloudiness, or discoloration, as these indicate polymer breakdown. Store away from direct sunlight and heat to slow degradation of the plastic matrix.
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.”
Microplastics from plastic cup wear
BPA-free polypropylene cups shed microparticles when blended at high speed or with abrasive ingredients (nuts, ice, seeds). Risk increases if the cup is older, scratched, or exposed to high temperatures; no specific testing on this model is on record.
BPS or other bisphenol leaching (BPA-free substitute)
BPA-free plastics often use BPS or BPF as replacers, which retain endocrine-disrupting properties. Leaching risk is low under normal use but increases with hot liquids or prolonged contact; Ninja does not disclose which bisphenol alternative (if any) is used in this cup.
Coating or sealing compound degradation
No reports of peeling coatings, discoloration, or taste/odor transfer specific to the 731KKU300 cup or motor housing. The plastic-only design avoids enamel or epoxy coatings that can degrade and leach heavy metals.
Heavy metals in plastic pigments or dyes
Colored plastics can contain cadmium or lead-based pigments, but food-contact blender cups are typically subjected to lower contamination risk than ceramics or glazed ware. No specific testing or recalls on this product model indicate heavy-metal presence.
Motor housing VOC off-gassing
Plastic motor housings in new appliances may emit low levels of volatile organic compounds (VOCs) from assembly adhesives or polymer processing. Odor usually dissipates within hours to days of unpacking; no chronic health hazard is reported, but off-gassing is common across the category.
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.
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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.