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stevef · Posted: Wed Dec 01, 2004 11:10 am Post subject: Specific Gravity of Plastics

Documentation of the Specific Gravity of Kite Studio's Plastic Stock

ABS = 1.02
Delrin = 1.42
UHMW = .965

Yes, ABS and Delrin both sink in water. UHMW floats.
_________________
Steve Ferrel
Go Build a Kite!
Measure once, buy twice!

knotronda · Posted: Sat Dec 04, 2004 1:40 am Post subject: Re: Specific Gravity of Plastics

Dorsal · Posted: Sat Dec 04, 2004 3:04 pm Post subject:

Ronda - Specific gravity is a number that gives the comparitive weight of materials, compared to water at 4° Centigrade. (At 4°C, water is at its densest, and is always the same. In other words, a constant.)
That means that, say, 1 cubic inch of water will have a value of 1.000. Anything with a value greater than 1 is heavier than water, anything with a value less than 1 will float on water.
The numbers by themselves are fairly useless, but by knowing that ABS is 1.02 while Delrin is 1.42, I know that Delrin is about 40% heavier than ABS for any given sized identical pieces. If weight were a major consideration in some thing that I was making, I would certainly consider the notion of making that thing out of ABS, if it met the rest of my design requirements.

Progcraft · Posted: Sat Dec 04, 2004 3:29 pm Post subject:

Dorsal, thank you very much for the description. I know I had no clue what it ment, but now I see that it can be usefull and important information. I appreciate your response.

Cheers,
P.
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Children of the Wind Kite Festival
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KiteSquid · Posted: Mon Dec 06, 2004 9:25 am Post subject:

Dennis,

That is one great explanation of SG.
_________________
VR/
KiteSquid
AKA TakoIka
AKA Harold
King George VA

P.S. Yet another post by the Squid..... Shocked

Doesent he ever shut up???

P.P.S. The wind is like the air, only pushier.

knotronda · Posted: Thu Dec 09, 2004 1:11 am Post subject:

I am thankful that someone responded to my quiry so that others could gain helpful knowledge. Thank you and you are welcome.

KR

dpb · Posted: Thu Dec 09, 2004 3:45 pm Post subject:

Of course there's also the fact that some of us are nerds (as you strongly suspected already Ronda), and and get excited about tech notes and specifications. You know, the type of kids who memerize the atomic weights for all the elements. Wink

Dave
_________________
Cherry Blossoms fall like rain,
A lively kite steals the sky,
Paradise in a moment.

KiteSquid · Posted: Thu Dec 09, 2004 4:12 pm Post subject:

Hello, My name is Harold and I am a Kite Geek!!!!!!!!!!!!!!!!!
_________________
VR/
KiteSquid
AKA TakoIka
AKA Harold
King George VA

P.S. Yet another post by the Squid..... Shocked

Doesent he ever shut up???

P.P.S. The wind is like the air, only pushier.

Dorsal · Posted: Thu Dec 09, 2004 11:39 pm Post subject:

Thank you, and you're welcome. Smile

knotronda · Posted: Fri Dec 10, 2004 11:25 pm Post subject:

Hello. My name is Ronda and I am knotty!!!

KR