Soybean Oil · Cast Iron Cookware Seasoning
Field Company Cast Iron Seasoning Oil
Lower PFAS concern. Pure soybean oil contains no fluorinated compounds.
Soybean oil is a plant-based seasoning with no fluorinated additives or coatings. No PFAS risk from the product itself.
The safe swap
Coconut Oil
Cast Iron Ultimate Bundle
90/100 safety
Same rubric that flunked this product. The swap earned its A.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Soybean oil (plant-based)
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
cookware 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
This product is soybean oil, a plant-derived triglyceride with no synthetic additives or coatings. Soybean oil contains naturally occurring compounds (primarily oleic and linoleic fatty acids) that polymerize when heated, forming a protective seasoning layer on cast iron. Unlike synthetic seasoning products, there are no fluorinated polymers, heavy metal binders, or resin curing agents involved in the formulation.
The brand's record and disclosure
Field Company maintains minimal public disclosure on this product's sourcing or processing beyond identifying it as soybean oil. No recalls, safety warnings, or third-party certifications (organic, non-GMO, or food-grade) are on record for this specific seasoning oil. The brand's general reputation in cast iron maintenance is established, but transparency around ingredient sourcing and refining methods is limited.
How it compares in its category
Soybean oil seasoning is a conventional choice in cookware maintenance, sitting between mineral oil (inert but non-polymerizing) and specialized high-smoke-point oils like grapeseed or avocado oil. It is cheaper and more accessible than certified food-grade alternatives and carries lower heavy metal risk than some vintage seasoning compounds or waxes. The main trade-off is smoke point: soybean oil smokes around 450F, requiring careful temperature control during seasoning application.
If you buy it
Apply thin coats only, using a cloth to wipe away excess oil before heating to avoid sticky buildup or rancid odor. Heat cast iron slowly to moderate temperatures (below 450F) when seasoning to prevent smoking and unpleasant fume release. Store the bottle in a cool, dark place away from direct sunlight to slow oxidation; discard if the oil smells musty or rancid. Reapply seasoning every few months of regular use, or after washing with soap.
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.”
Oxidation and rancidity over time
Soybean oil is prone to oxidative breakdown, especially if stored in warm, humid conditions or exposed to light. Rancid oil produces off-odors and potentially irritating volatile compounds when heated; discard if smell becomes musty or sour.
Smoke and fume inhalation during heating
Soybean oil has a relatively low smoke point (around 450F). Heating above this threshold releases acrolein and other volatile aldehydes, which can irritate airways. Use low to moderate heat and ensure ventilation during seasoning.
Bacterial or mold growth if contaminated
Once opened, soybean oil can accumulate moisture or microbial growth if exposed to air repeatedly or stored improperly. Risk is low with normal storage but increases if the bottle is left uncapped or stored in humid environments.
Pesticide residues in non-organic soybean oil
No specific testing or recalls for this product exist on record. Conventional soybean oil may contain trace pesticide residues common to soy crops, but typical seasoning amounts applied to cookware pose negligible dietary risk.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 92% 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.
Safer alternatives in Cast Iron Cookware Seasoning
Coconut Oil
Cast Iron Ultimate Bundle
cast iron, bare or seasoned with coconut oil
Lower PFAS concern. Bare cast iron is inherently PFAS-free.
⚠Risky category by default
Soybean Oil
Crisbee Puck Cast Iron Seasoning
Soybean oil, beeswax blend
Lower concern. Traditional seasoning oil without non-stick coatings.
⚠Risky category by default
Hemp Oil
Carrington Farms Hemp Oil
Hemp seed oil, liquid cooking oil
Lower concern. Unrefined plant oil has no known PFAS risk.
⚠Risky category by default
More cast iron cookware seasoning 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.