Stren · Fishing Line
Stren Super Knot Monofilament Line
Lower PFAS concern, standard nylon monofilament is unlikely to contain PFAS unless treated, and no public evidence suggests Stren does.
Stren Super Knot is a conventional nylon monofilament fishing line with no disclosed coatings, treatments, or PFAS-related claims from the brand. Monofilament nylon itself does not inherently require PFAS. No public lab data or regulatory flags exist for this product, making it a lower-concern choice among fishing lines.
Shop Stren on Amazon →Material
Monofilament nylon fishing line
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
other 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
Stren Super Knot is monofilament nylon, a single continuous polymer strand extruded and tensioned to create fishing line. Nylon monofilament is chemically inert under normal water and room-temperature conditions and does not leach significant compounds into food or drinking water since fishing line never contacts consumables. The material's stability in freshwater and saltwater environments makes it one of the most chemically benign products in the fishing category.
The brand's record and disclosure
Stren, owned by DuPont subsidiary DSM, has not published formal safety disclosures or third-party certifications specific to monofilament composition. No recalls or safety warnings for Stren Super Knot appear in FDA or CPSC records. The brand maintains silent stance on PFAS, but monofilament nylon used in fishing line is not a documented PFAS application unless Teflon-family coating coatings are added, for which no evidence exists in this product line.
How it compares in its category
Monofilament fishing line (nylon, fluorocarbon, or copolymer) is the safest category of fishing gear from a materials perspective, requiring no flame retardants, dyes, or coatings that characterize textiles or cookware. Stren Super Knot sits at the middle-high end of the monofilament market; alternatives like braided line or fluorocarbon introduce different chemical profiles but no measurably superior safety. This product's nylon backbone is consistent with industry standard.
If you buy it
Store in cool, dry conditions away from prolonged UV exposure, which degrades nylon over time and can reduce line strength; discard and respool every 1-2 seasons if frequently used. Wash hands after handling if you have sensitive skin, as some users report minor irritation from nylon friction rather than chemical leaching. Do not ingest or expose to heat above 80C (176F). Recycle or dispose of spent line properly to avoid wildlife entanglement; do not flush.
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.”
Nylon polymer degradation and microparticle release
Prolonged UV exposure or mechanical wear (spooling, friction) can degrade monofilament nylon into microparticles, particularly in aquatic environments. This is a known concern for all nylon fishing line generally, though Stren does not differ from competitors in this regard.
Skin irritation from mechanical friction
Nylon monofilament can cause minor abrasion or dermatitis in users with sensitive skin due to friction during casting or handling, not chemical toxicity. This is an ergonomic rather than toxicological hazard and varies by individual.
Heavy metals in pigmentation (if colored)
Stren Super Knot is available in clear and tinted variants. No public test data or recalls document heavy metal contamination in colorants used by Stren monofilament. Nylon monofilament typically uses minimal pigment compared to braided or coated alternatives.
Leachates from additives (plasticizers, UV stabilizers)
Monofilament nylon may contain stabilizers or processing aids, but nylon's chemical stability and non-food contact use mean leaching risk is negligible. No documented incidents of additive migration from Stren fishing line into water or skin.
Fluorocarbon or Teflon-type coating hazards
Some premium monofilament lines are fluorocarbon-coated; Stren Super Knot is standard nylon without Teflon-family coating treatment. No evidence of Teflon-type coating fume or degradation risk in this product line under normal use.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 70% 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 Fishing Line
Stren
Original
Monofilament nylon fishing line
Lower PFAS concern for a fishing line product; no coating or treatment typical of PFAS carriers.
⚠Risky category by default
Maxima
Ultragreen One Shot
Lubricant/chain oil (mineral or synthetic base)
Lower PFAS concern for a chain lubricant; minimal Teflon-family coating/waterproofing risk profile.
⚠Risky category by default
Seaguar
Blue Label
Fluorocarbon fishing line (monofilament)
Fluorocarbon fishing line may contain PFAS; insufficient public data to grade definitively.
⚠Risky category by default
More fishing line 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.