Sufix ProMix Monofilament Fishing Line
Monofilament nylon lower concern, no transparency offered.
Standard monofilament fishing line typically uses nylon without intentional PFAS treatment. Brand provides no public disclosure about PFAS or materials.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Monofilament nylon fishing line
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.
Microplastic shedding
Monofilament degrades slowly in freshwater and saltwater, shedding microfibrils over months to years. This is an environmental hazard (marine ingestion, bioaccumulation) rather than a direct consumer toxicity hazard, but anglers should dispose of waste line in trash rather than environment.
PFAS
Nylon extrusion may use PFAS-containing processing aids or fluorochemical coatings (mold releases, water treatment) in legacy facilities. Sufix has not disclosed whether these are used; the risk is lower than in other product categories but transparency is absent. Graded separately per your assignment.
Source, ATSDR ↗What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Residual nylon monomer (caprolactam) leaching
Nylon 6 monofilament can release trace caprolactam into water over extended periods, but concentrations in sport-fishing contexts are negligible and no health reports exist for anglers. Concern is theoretical and primarily relevant to industrial water reuse, not recreational use.
UV degradation and brittleness
Extended UV exposure causes nylon to become brittle and lose tensile strength, but this is a performance failure, not a toxicological hazard. No chemical leaching accelerates with UV damage under normal water temperatures.
Heavy metals
Commercial monofilament does not typically require heavy-metal pigments or stabilizers in nylon formulation. No published recalls or test data suggest lead, cadmium, or chromium in Sufix ProMix specifically, and the material class does not present known risk.
Source, FDA ↗The full breakdown
What it's made of and why it matters
Sufix ProMix is a monofilament nylon (likely nylon 6 or 6.6) extruded into a single continuous filament. Nylon monofilament does not require lead, cadmium, or other heavy metals in its manufacture, and the polymer itself does not leach toxic compounds under normal freshwater or saltwater use. The primary chemical concern in nylon monofilament is residual monomer (caprolactam in nylon 6) and processing aids, but these are present in trace amounts and remain locked in the polymer matrix during typical fishing scenarios where the line is submerged and never heated above ambient temperature.
The brand's record and disclosure
Sufix (owned by Rapala-VMC) has not published transparent statements about PFAS use in their monofilament manufacturing or water treatment processes. The brand does not advertise third-party testing or chemical certifications specific to this product line. No recalls or safety controversies specific to Sufix ProMix monofilament are on public record. The silence on fluorochemical use is typical of legacy fishing-line manufacturers and does not confirm presence, but indicates a lack of proactive disclosure that consumers concerned about PFAS may want to note.
How it compares in its category
Monofilament nylon is the oldest and most chemically stable option in fishing line. Alternatives like fluorocarbon (which may contain more fluorochemicals) and braided polyethylene carry their own trade-offs. Among monofilament brands, Sufix is a mainstream commercial product with no known safety advantage or disadvantage versus Berkley, Stren, or store-brand equivalents. The material class itself is lower-hazard compared to coated cookware, plastic food storage, or textiles, making hazard profiles relatively narrow.
If you buy it
Monofilament should never be heated above 85-90 degrees Celsius (185-194°F), which is well above any normal use scenario (fishing in sun, storage). Store in a cool, dry place away from UV light to prevent brittleness and degradation, not to avoid chemical leaching. Replace the line annually or when it shows visible damage, cloudiness, or loss of strength; older line is a performance issue, not a safety issue. Never ingest or allow prolonged skin contact with discarded line, and dispose of properly to avoid wildlife entanglement, this is an environmental concern, not a toxicity concern.
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
- Sufix has made none
Formulations change between production runs, so check the current label. How we grade.
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.