Results 1 to 8 of 8
  1. #1
    Senior Member mattyoc20's Avatar
    Join Date
    Mar 2013
    Location
    Dresher, PA
    Hammock
    DH RoamingGnome
    Tarp
    Superfly
    Insulation
    ALL HG Quilts
    Suspension
    Whoopies
    Posts
    287

    1500mm vs 2000mm silnylon

    Is it a big difference between the the two? Im not even really sure what it means. I noticed the superfly is 2000mm 30d. Im looking at fabric from ripstop by the roll and it says it is 1500mm and 20d. Is that a big deal?

  2. #2
    SnrMoment's Avatar
    Join Date
    Aug 2010
    Location
    Falling Rock, MT
    Hammock
    DIY
    Tarp
    DIY
    Insulation
    Goose bumps
    Suspension
    Bat Feet
    Posts
    1,439
    Those are Hydrostatic Pressure Ratings. That is, the amount of water pressure applied before the water penetrates the fabric. The 20D fabric is lighter weight and I use it as side panels with a 30D top piece.

    Love is blind. Marriage is an eye opener.

  3. #3
    Senior Member paulw's Avatar
    Join Date
    May 2014
    Location
    Alberta Canada
    Hammock
    LSOH,WARRIOR EDGE
    Tarp
    dd xl
    Insulation
    LSOH Toaster Down
    Suspension
    various
    Posts
    409
    Quote Originally Posted by SnrMoment View Post
    Those are Hydrostatic Pressure Ratings. That is, the amount of water pressure applied before the water penetrates the fabric. The 20D fabric is lighter weight and I use it as side panels with a 30D top piece.


    srn moment that is a sweet looking tarp you have there very nice indeed

  4. #4
    Senior Member
    Join Date
    Sep 2010
    Location
    Knoxville, TN
    Hammock
    Clark North American
    Tarp
    MYOG Cuben
    Insulation
    MYOG TQ/UQ
    Suspension
    Amsteel
    Posts
    197
    Quote Originally Posted by mattyoc20 View Post
    Is it a big difference between the the two? Im not even really sure what it means. I noticed the superfly is 2000mm 30d. Im looking at fabric from ripstop by the roll and it says it is 1500mm and 20d. Is that a big deal?
    How about this question instead - Will 1500mm be waterproof enough for my type of shelter and in my area? If so, that extra 500mm has no consequence except for making a heavier tarp generally. In my opinion, 1500mm is fine for a steep sided shelter like a tarp especially given that you will be in tree cover.

    Ryan

  5. #5
    Member
    Join Date
    Feb 2015
    Location
    Nyon, Switzerland
    Hammock
    WBRR / DD superlight
    Tarp
    Superfly
    Insulation
    EE Rev20°/Lynx 20°
    Suspension
    Whoopies
    Posts
    71
    agreed really no noticeable difference between 1500 and 2000. as a more extreme example the HH (hydrostatic head) of an MSR Hubba tent is something like 1200 and it seems US tents have lower HH ratings than tents made by European manufacturers. I have a Vango Halo 200 (UK made tent) which has a HH of 5000. European manufacturers seem to play on our fears that we need materials that are much more waterproof as apparently our rain is more wet and our wind stronger than yours
    but that doesn't stop many many Europeans buying US made tents/tarps etc including an absolute sh-t load of Hubba's... and funnily enough even our super wet rain doesn't make your products leak
    point of my long winded story is don't worry about 1500 or 2000, you'll stay dry.
    All the gear and no idea.....

  6. #6
    Senior Member Boston's Avatar
    Join Date
    Sep 2012
    Location
    Georgetown, KY
    Hammock
    DIY w/ Net
    Tarp
    DIY 11'x10' Hex
    Insulation
    DIY UQ/TQ
    Suspension
    DIY Whoppies + TS
    Posts
    1,760
    Images
    44
    There is no universal standard for what hydrostatic head pressure is considered waterproof, as it varies based on condition's.

    I have seen standard's that classify a material as waterproof if it it's minimum HH is 800mm. Others state 1000mm, or 1500mm.

    A Sea to Summit article states a heavy, wind driven rain (what wind speed, I don't know) can penetrate 2000mm.

    Tyvek is ~1300mm and I have had an umbrella made from it mist in a heavy KY rainstorm.

    That said, in hammock you're generally in tree cover, which provides a wind break, and can serve to break up the rain drop's. A fabric that might mist when set up out in the open, may be ok for a hammock set up because of this.

    Many sil provider's wont advertise, or wont know their HH rating. RSBTR has his material tested and advertises it, which is great.

    You can also judge by the coating weight. Generally more will provide a better result. Oware told me his 70D sil coated fabric with a 0.5oz/sqyrd coating is rated to ~5000mm. He didn't know for his lighter material's, but the 1.1 sil 2nd's I got from him were about 1.5 oz/sqyrd - for about a 0.4 oz/sqyard coating. This fabric has a significantly visible, and tactile difference when compared to other silnylon's I've used (RSBTR, Noah Lamport). The coating is much heavier.

    I imagine the weave, and thread count will also impact the rating (tighter weave may be better).

  7. #7
    Senior Member Brian's Avatar
    Join Date
    Nov 2006
    Location
    Boston, MA
    Hammock
    WBBB 1.1 Dbl
    Tarp
    MacCat Deluxe Sil
    Insulation
    DIY Quilt+HG Inc20
    Posts
    391
    There is a ton of variables that account for how waterproof the fabric is - coating type, how the coating is applied, yarn count and density, how the yarns are woven, how the fabric is being loaded (stretched), how old the fabric is, how the ripstop is woven, etc, ect...

    The last big factor is how it is tested - there are several test standards available, all of which have their pluses and minuses. Not to mention the fact that Boston had mentioned - what is the minimum required? Some of it is marketing, some of it is actual good science.

    I had done my Master's thesis work on a bunch of this work, feel free to take a look for yourself - http://outdoorequipmentsupplier.com/Thesis_web.pdf.

    All in all, I personally feel that a 1500mm rating is pretty darn acceptable (and then some) - once you start getting real world conditions where you get enough permeation through the fabric to start to cause moisture problems with that type of coating, you're going to have much bigger problems (i.e. very heavy winds).
    Brian MacMillin
    www.OutdoorEquipmentSupplier.com
    Home of the new MacCat Gen4 hammock tarps

  8. #8
    Senior Member Rain Man's Avatar
    Join Date
    Nov 2007
    Location
    Nashville, TN
    Hammock
    Hammeck Netty
    Tarp
    HG dyneema/MacCat
    Insulation
    DIY UQ and UGQ TQ
    Suspension
    whoopie slings
    Posts
    2,907
    Images
    8
    Lots of good info in this thread. I'll risk a bit of layman's experience. Seems to me that when it's all that rainy and windy, you're getting a lot of air moisture (humidity) on everything under your rainfly, no matter how waterproof the rainfly is. So, fixating on the rainfly might give a false sense of security from all wetness.

    Even so, I do want my rainfly as waterproof as reasonable, of course.

    Rain Man
    "You can stand tall without standing on someone. You can be a victor without having victims." --Harriet Woods

    http://www.MeetUp.com/NashvilleBackpacker
    .

  • + New Posts
  • Similar Threads

    1. FS: HH Hex 30D SilNylon
      By fastfoxengineering in forum [SOLD/WITHDRAWN] Items no longer available
      Replies: 0
      Last Post: 01-31-2015, 18:53
    2. Replies: 0
      Last Post: 03-29-2014, 17:08
    3. WTB: Silnylon
      By jasonb986 in forum Archived WTB
      Replies: 5
      Last Post: 03-02-2012, 09:55
    4. Need 1.1 oz Silnylon
      By Tosto in forum Archived WTB
      Replies: 4
      Last Post: 05-20-2008, 18:21
    5. 1.3 oz Silnylon
      By Narwhalin in forum Do-It-Yourself (DIY)
      Replies: 3
      Last Post: 02-27-2008, 16:00

    Bookmarks

    Posting Permissions

    • You may not post new threads
    • You may not post replies
    • You may not post attachments
    • You may not edit your posts
    •