Spiderwire · Fishing Line & Fishing Tackle
SpiderWire UltraCast Ultimate Mono Fishing Line
Lower concern. Monofilament nylon typically PFAS-free, but verify with brand.
SpiderWire UltraCast Ultimate Mono is standard monofilament nylon without known PFAS treatment. Brand discloses nothing about PFAS; direct inquiry recommended for certainty.
Shop Spiderwire on Amazon →Material
Monofilament nylon fishing line
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
SpiderWire UltraCast Ultimate is extruded monofilament nylon, a thermoplastic polymer engineered for strength and water resistance. Unlike multifilament lines or PVC-coated alternatives, monofilament nylon has minimal surface treatments and no known lead, cadmium, or phthalate additives in standard formulations. The material is inert in water and does not degrade significantly under normal freshwater or saltwater use, meaning chemical leaching into your catch or hands is not a documented concern.
The brand's record and disclosure
Spiderwire is owned by Pure Fishing and has no known public disclosure regarding PFAS content in their monofilament lines, nor any published safety certifications specific to chemical composition. The brand has not faced notable recalls related to chemical contamination of this product line. Transparency on material sourcing and additives remains minimal across the fishing line category overall, making independent verification difficult.
How it compares in its category
Monofilament nylon lines like this are safer than older PVC-coated or lead-weighted alternatives in terms of leachable toxins. They are comparable to other premium monofilament brands (Berkley, Trilene, Suffix) in material composition. Braided and fluorocarbon lines may introduce additional manufacturing additives, making monofilament a lower-chemical-load choice for recreational fishing.
If you buy it
Store the spool in a cool, dry place away from direct UV light, which degrades nylon over time and may increase brittleness but not chemical release. Monofilament has no heat limits relevant to normal use (fishing does not expose it to temperatures above nylon's thermal window). Replace line annually or after visible wear to maintain strength and avoid breakage in water. Dispose of spent line in regular trash or recycling if your facility accepts plastic polymers; do not leave it in water where it can harm aquatic life.
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.”
PFAS in monofilament nylon
Monofilament nylon typically does not require PFAS for its core function, but some manufacturers may use PFAS-containing additives for water resistance or processing aids. Spiderwire has not disclosed whether their formulation includes fluorinated compounds; verification with the brand is recommended if PFAS avoidance is a priority.
Microplastic shedding
Monofilament nylon does not shed microplastics under normal fishing conditions. Degradation in water is extremely slow (10+ years), and fragmentation only occurs after significant UV damage or mechanical wear, which is not a typical exposure route for users.
Heavy metals in nylon polymer or colorants
Standard monofilament nylon formulations do not contain lead or cadmium. Color additives in fishing lines are typically organic dyes rather than heavy-metal-based pigments, but brand-specific verification is not publicly available for Spiderwire.
Additives (UV stabilizers, processing aids)
Nylon extrusion typically requires hindered amine light stabilizers (HALS) or phenolic antioxidants to prevent UV degradation. These are not acutely toxic to users but are present in the finished product; Spiderwire does not disclose specific additives.
Off-gassing or odor from new line
Monofilament nylon does not off-gas volatile organic compounds (VOCs) at room temperature. Any smell from new line is residual processing solvent and dissipates within hours of opening the spool.
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.
More fishing line & fishing tackle 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.