Hemp Oil · Cast Iron Cookware Seasoning
Field Company Cast Iron Seasoning Oil
Lower concern. Hemp oil is inherently PFAS-free; cast iron is bare material.
Hemp oil is an organic plant-based seasoning with no known PFAS content. Cast iron cookware itself contains no PFAS when bare and uncoated.
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
Hemp oil seasoning, applied to bare cast iron
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
Hemp oil is a plant-derived oil extracted from cannabis sativa seeds, composed primarily of polyunsaturated fatty acids (linoleic and alpha-linolenic acid). When applied to cast iron, it polymerizes under heat into a hard protective layer that prevents rust and enables non-stick cooking. Unlike synthetic coatings (Teflon-type coating/Teflon) or enamel glazes, hemp oil contains no intentional additives, pigments, or resins that would leach into food during normal cooking.
The brand's record and disclosure
Field Company does not appear to have published third-party certifications, lab reports, or formal safety disclosures for this product in public records. The brand's stance on PFAS and other contaminants is silent. No recalls, safety complaints, or regulatory actions specific to this seasoning oil are on record. Absence of disclosure does not indicate a problem, but it means independent verification of purity (e.g., pesticide residues, heavy metals) is not publicly available.
How it compares in its category
Seasoning oils occupy a low-risk category compared to non-stick coatings or ceramic enamels. Plant-based oils (hemp, flaxseed, grapeseed) pose none of the Teflon-type coating fume risks or lead-in-glaze concerns of coated cookware. Cast iron seasoning is also reversible: if contamination or rancidity occurs, you can strip and re-season. Typical commercial cast iron seasonings use food-grade oils with similar profiles; hemp oil is standard in artisanal cookware markets.
If you buy it
Apply thin layers and heat to smoke point (around 330F for hemp oil) to allow polymerization; multiple thin coats are safer than one thick layer, which may become sticky or rancid. Store the bottle in a cool, dark place away from heat and light to prevent oxidation. Replace or refresh the seasoning layer every 6-12 months of heavy use, or if you notice rust spots or sticking. Do not heat cast iron beyond typical stovetop/oven temperatures (450F) with any oil seasoning, as degradation or smoke becomes likely.
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.”
Oil oxidation and rancidity
Hemp oil contains polyunsaturated fats that oxidize over time, especially if stored warm or in light. Rancid oil can impart off-flavors or odors to food but is not acutely toxic at low levels; proper storage and timely re-seasoning minimize this risk.
Pesticide residues in hemp oil
No recalls or documented contamination of food-grade hemp oil with pesticides are on record for Field Company. However, without third-party testing data, residual pesticides cannot be ruled out; sourcing and farming practices are not publicly disclosed.
Heavy metals (cadmium, lead) in oil
Hemp oil itself does not contain lead or cadmium as inherent components. Contamination would only occur if the oil was processed or stored in contaminated vessels; no such incidents are documented for this brand.
Smoke or fume inhalation at high heat
Hemp oil begins to smoke around 330F. If cast iron is heated well above this temperature (e.g., 500F oven), the seasoning may degrade and emit acrid fumes. This is not unique to hemp oil but a property of all plant-based cooking oils; proper temperature management avoids this.
Coating degradation and flaking
Seasoning oils create a thin, food-safe polymerized layer; unlike synthetic coatings, they do not flake or shed particles into food. Mechanical wear exposes bare iron, not coating fragments.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 82% 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.