Phosphor Bronze vs 80/20 Bronze Acoustic Guitar Strings

Phosphor Bronze vs 80/20 Bronze Acoustic Guitar Strings

Without question, phosphor bronze and 80/20 bronze are the two most popular acoustic guitar string alloys—but what are the differences between them? Let’s talk about it:

Phosphor Bronze vs 80/20 Bronze Acoustic Guitar Strings

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Today we’re talking a little bit about the different alloys that are available for acoustic guitar strings and what those mean for the sound and playability of your guitar.

So while there are a couple different alloys used in acoustic guitar stringsphosphor bronze, 80/20 bronze, monel, even just standard nickel plated steel—really the two that are most often used—and I really mean like 98% or 99% of all sets seem to feature these two alloys—are phosphor bronze and 80/20 bronze, so those are the two that we’re really going to focus on today.

For us at Stringjoy those alloys can be found in our Natural Bronze, which is our phosphor alloy, and our Bright Brass, which is our 80/20 alloy. Everybody sort of has their own “branded” terms for alloys that fall into these categories, those are ours.

80/20 Bronze Acoustic Guitar Strings

80/20 bronze was one of the most popular alloys throughout the middle of the 20th century before phosphor bronze was brought to market in the 70s.

This is a pretty simple alloy, it’s 80% copper and 20% zinc, it has a really bright sort of tone—I think it’s best known for its brightness. A lot of players find that it has quite a bit of bass as well. It doesn’t have quite as much midrange as phosphor bronze though, it’s a little bit more of a scooped sort of frequency response overall.

80/20 Bronze is probably the least popular of the two alloys these days, though a lot of players do still really like it. Really if you’re looking for a really, really bright and articulate sound, this is the gauge for you.

The main drawback to 80/20 bronze has always been and probably always will be that it really just doesn’t last as long as phosphor bronze for some reasons that we’ll talk about here in a second.

80/20 bronze lifespan can vary on the player, but some players with very acidic sweat find that it only lasts for a couple days before it kind of wears out a little bit on them. Some players can get a lot more life out it, especially if they’re wiping their strings down, using a string conditioner, or anything like that, but in general 80/20 bronze in the same conditions is pretty much never going to outlast phosphor bronze.

Phosphor Bronze Acoustic Guitar Strings

Phosphor bronze, on the other hand, is a bit of a newer invention, not really new exactly, as it was back in the second half of the 20th century when we started to see phosphor bronze come into vogue. It seemed to pretty quickly supplant 80/20 bronze in popularity once it hit the market and players became aware of it.

Basically phosphor bronze is 92% copper—so a little bit more copper than 80/20 bronze—has about 8% tin and contains trace amounts of phosphorous, which is what makes it a little bit more corrosion resistant compared to 80/20 bronze.

Phosphor bronze is really known for having a balanced, rather warm response. It has a little bit more mid-range than you see in 80/20 bronze, it doesn’t have those really peaky, ice-picky highs, or that really, really strong bass either. It’s just kind of a nice flat, natural sort of sound. Our Natural Bronze Acoustic Guitar Strings we love for this.

In general, those are the big tonal differences that we see between phosphor bronze and 80/20 bronze, we don’t generally see that there’s a huge difference in playability, at least not that most players can really tell. There’s certainly some difference in the alloys there but not that overcomes the impact of the steel core, which is always going to be the same on both of them.

If you haven’t already, check out the video above to hear a sonic comparison of the two alloys. Just scroll past all the talking since you just read most of it.

What do you think?

Obviously everybody has their preferences, nothing is right for everyone but that’s the beauty of having all sorts of different options, is that everyone can try things and find what they like. Be sure to share your experience, let us know what you really like down in the comments and thanks for watching.


  1. Have 1980 Gibson Custom Acoustical, play folk, rock,blues,,. What strings would you reccomend I use to create upbeat sound.
    • Thanks for reaching out Patrick! No set of strings will have any effect on tempo ? But joking aside, typically I recommend folks start with our Natural Bronze alloy in Super Light or Light gauge.
  2. I have purchased and installed Stringjoy products on the three Acoustic guitars I own and I love them all, thank you.
  3. I appreciate having the transcript of the video! I often skip videos tho will read some to see if I'm interested I am now a Stringjoy guitarist!
  4. I currently use Elixer phosbronze in my Taylor 914. So I am pretty happy with the sound it produces. I think the 80/20 doesn’t match up well with the Taylor and no way for nickel. I just received my first set of Stringjoy PhosBronze. I will be changing out to them this weekend to see how they compare. I haven’t played acoustic strings that weren’t coated for awhile. It will be interesting.
  5. How about a mix? What would we see if we went with the highest four strings in phosphor bronze, then the low A and E in 80/20 to bring out a bit more bass?
  6. This post that arrived at my mail was a big coincidence, I purchased 80/20 and phosphor bronze together from amazon just a week ago and was going to put them on today. Whoa. Simply can't believe it.
  7. I put a set of monel nickels on and thought I liked the warmer tone until I went on stage....big surprise. Not using them again. I liked what you said about the 80/20 having a mid scoop and little more bass... acid hands are not a prob... I will put those on my gibson next... currently using a set of your phos strings on a specialized Gt... I will use the 80/20 next... looking forward to trying the phos strings on my Martin... thanks for the updates. Could not really tell a diff on your vid tape due to the M1 pick up... maybe best to try a mic so I can hear a little better from a distance.
  8. Couldn’t tell much difference between the 20/20. bronze & the phosphorus/bronze but the nickel wound sounded much weaker & darker. Didn’t care for the nickel.

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