• Welcome to ScubaBoard

  1. Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.

    Benefits of registering include

    • Ability to post and comment on topics and discussions.
    • A Free photo gallery to share your dive photos with the world.
    • You can make this box go away

    Joining is quick and easy. Login or Register now by clicking on the button

Nylon vs. polyethylene (Dacron) line: which is better for knots?

Discussion in 'Technical Diving' started by SaltyWombat, Jun 18, 2021.

  1. SaltyWombat

    SaltyWombat Contributor

    # of Dives: 50 - 99
    Location: US
    101
    23
    I just picked up some Dacron (polyethylene) cave line to tie bolt snaps to various places. I find that a reef (square) knot comes undone very easily with this line. It will get better when I burn & seal the ends, but still I'd prefer the knot to be more reliable.

    I don't have any nylon line on me right now. How does it compare to polyethylene when it comes to knots?
     
  2. tbone1004

    tbone1004 Technical Instructor ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
    18,799
    11,330
    nylon holds significantly better than pet
     
    SaltyWombat likes this.
  3. SaltyWombat

    SaltyWombat Contributor

    # of Dives: 50 - 99
    Location: US
    101
    23
    Ah, I meant PET (polyethylene) and not polyester (what I originally said). I've edited my original post.
     
  4. 2airishuman

    2airishuman Contributor

    # of Dives: 100 - 199
    Location: Greater Minnesota
    2,639
    1,893
    Dacron is polyester and it holds knots reasonably well and had neutral buoyancy

    Nylon holds knots less well

    Polyethylene is floaty and holds knots least well
     
    rjack321 and Sam Miller III like this.
  5. tbone1004

    tbone1004 Technical Instructor ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
    18,799
    11,330
    all dacron is polyester, not all polyester is dacron, and all PET is polyester but not all polyester is PET. In terms of non-textile/materials engineering, they're all the same though.
     
  6. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, Washington State
    11,333
    6,162
    you dont want floaty polypropylene line - which also doesnt hold knots

    Nylon is the default standard, polyester/dacon is fine
     

Share This Page