Phosphor Bronze · Guitar Strings
Gibson Coated Phosphor Bronze Acoustic Guitar Strings
Lower PFAS concern; acoustic strings are not a typical PFAS-risk category, but coating details remain opaque.
Phosphor bronze is an established, PFAS-free base material for guitar strings. Gibson does not disclose the specific composition or finish used on these strings, so the coating remains unknown.
Shop Phosphor Bronze on Amazon →Material
Phosphor bronze wire with unspecified coating
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
Phosphor bronze is a copper-tin-phosphorus alloy widely used in acoustic strings because it resists corrosion and maintains tonal quality. The phosphorus acts as a deoxidizer during manufacturing and becomes part of the stable crystalline structure; it does not leach during normal use. Gibson applies an unspecified protective coating to delay oxidation and string degradation, a standard industry practice, though the coating material itself is not publicly disclosed by the brand.
The brand's record and disclosure
Gibson (the parent brand) has no established public record of safety certifications, third-party testing disclosures, or controversies specific to string manufacturing. The manufacturer does not publicly detail coating composition, which is typical of guitar string makers but limits independent verification. No recalls or safety incidents related to Gibson acoustic strings are documented in public safety databases.
How it compares in its category
Phosphor bronze is the industry standard for acoustic strings and is chemically inert in the context of human contact (strings do not enter the mouth or food chain). Alternative materials like steel or nickel-wound strings carry similar or slightly higher corrosion risk but no additional chemical hazards. Gibson's phosphor bronze formulation sits squarely in the mainstream of acoustic string safety.
If you buy it
Handle strings with dry hands to minimize sweat-induced corrosion; replace strings every 1-3 months depending on playing frequency and water exposure. Store in a dry case or pouch to prevent oxidation acceleration. There are no temperature, light, or storage restrictions beyond normal humidity control. Wash hands after playing if you have sensitive skin, as phosphor bronze dust is not hazardous but may irritate eczema.
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.”
Coating composition opacity
Gibson does not publicly specify the coating material (e.g., lacquer, polymer, oil-based). While standard coatings are non-toxic, the lack of disclosure prevents verification that heavy metals or volatile solvents are absent.
Metal leaching from core wire
Phosphor bronze is stable and does not leach copper, tin, or phosphorus into food, skin, or saliva under normal acoustic string use. Strings do not contact food or open wounds in typical play.
Corrosion byproducts (copper oxide/patina)
Over time, uncoated or compromised-coating sections oxidize to form green/brown patina. Copper oxide itself is not acutely toxic in trace amounts from string contact, but high chronic inhalation of copper dust is a known occupational hazard irrelevant to string players.
Allergen or irritant from residual manufacturing oils or solvents
No documented cases of dermatitis or allergic reaction to Gibson phosphor bronze strings exist in public records. Manufacturing solvents, if present, would evaporate during curing and before consumer purchase.
Breakage and puncture injury
This is a mechanical, not chemical, hazard: worn or damaged strings snap under tension and can cut fingers or eyes. This is inherent to acoustic strings, not specific to Gibson, and managed through routine replacement.
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.
Safer alternatives in Guitar Strings
Martin
Retro Acoustic Guitar Strings
Phosphor bronze, stainless steel, nylon wound
Lower concern, acoustic guitar strings typically use established metals and nylon without water-repellent coating or nonstick coatings.
✓Bare metal or glass, no coating at all
Acoustic360
Ernie Ball Everlast Acoustic Guitar Strings
Phosphor bronze/stainless steel wound on steel core
Lower PFAS concern, acoustic guitar strings use standard metal materials with no known fluorochemical treatments.
✓Bare metal or glass, no coating at all
Dean Markley
Electric Guitar Strings
Steel alloy strings (nickel-plated or stainless steel core)
Lower PFAS concern, steel strings lack typical PFAS applications, but no brand disclosure exists.
✓Bare metal or glass, no coating at all
More guitar strings 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.