 |
|||||
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
Specific Gravity
DEFINITION:
Specific Gravity is the ratio of the density of a material as compared to the density of water
at standard atmospheric pressure (1 ATM) and room temperature (73F). Because it is a ratio, it
has no units of measure. However, since the density of water (at STP) is 1 gram/cm3,
the density of the material being considered is the same as its specific gravity when working
in SI units. For instance, a material with a specific gravity of 1.05 has a density of 1.05 gm/cm3
(.0378 lbs./in3).
WHERE IS IT USED:
Specific Gravity and Density are used by toolmakers, molders and end users to determine how much
a plastic part (of defined geometry and volume) will weigh. It is also used for comparing the
weight of one material to another for cost analysis and product positioning/selection.
A key unit of cost measure when comparing materials is cost /unit volume. A material which has a low cost per pound but a high specific gravity may not be as cost effective as a higher priced material with a low specific gravity. Specific gravity and density help us interpret this formula: ($/lb.) x 0.0361 x (specific gravity) = $/in3.
WHERE IS SPECIFIC GRAVITY FOUND:
Specific gravity or density is published as standard information on virtually all manufacturers'
product data sheets which are available through GE Polymerland's customer service at 1-800-PLASTIC.
DISCLAIMER: THE MATERIALS AND PRODUCTS OF THE BUSINESSES MAKING UP THE GE PLASTICS UNIT OF GENERAL ELECTRIC COMPANY, ITS SUBSIDIARIES AND AFFILIATES ("GEP"), ARE SOLD SUBJECT TO GE POLYMERLAND'S STANDARD CONDITIONS OF SALE, WHICH ARE INCLUDED IN THE APPLICABLE DISTRIBUTOR OR OTHER SALES AGREEMENT, PRINTED ON THE BACK OF ORDER ACKNOWLEDGMENTS AND INVOICES, AND AVAILABLE UPON REQUEST. ALTHOUGH ANY INFORMATION, RECOMMENDATIONS, OR ADVICE CONTAINED HEREIN IS GIVEN IN GOOD FAITH, GE POLYMERLAND MAKES NO WARRANTY OR GUARANTEE, EXPRESS OR IMPLIED, (I) THAT RESULTS DESCRIBED HEREIN WILL BE OBTAINED UNDER END-USE CONDITIONS, OR (II) AS TO THE EFFECTIVENESS OR SAFETY OF ANY DESIGN INCORPORATING GE POLYMERLAND MATERIALS, PRODUCTS, RECOMMENDATIONS OR ADVICE. EXCEPT AS PROVIDED IN GE POLYMERLAND'S STANDARD CONDITIONS OF SALE, GE POLYMERLAND AND ITS REPRESENTATIVES SHALL IN NO EVENT BE RESPONSIBLE FOR ANY LOSS RESULTING FROM ANY USE OF ITS MATERIALS OR PRODUCTS DESCRIBED HEREIN. Each user bears full responsibility for making its own determination as to the suitability of GE Polymerland's materials, products, recommendations, or advice for its own particular use. Each user must identify and perform all tests and analyses necessary to assure that its finished parts incorporating GE Polymerland materials or products will be safe and suitable for use under end-use conditions. Nothing in this or any other document, nor any oral recommendation or advice, shall be deemed to alter, vary, supersede, or waive any provision of GE Polymerland's Standard Conditions of Sale or this Disclaimer, unless any such modification is specially agreed to in a writing signed by GE Polymerland. No statement contained herein concerning a possible or suggested use of any material, product or design is intended or should be construed, to grant any license under any patent or other intellectual property right of General Electric Company or any of its subsidiaries or affiliates covering such use or design, or as a recommendation for the use of such material, product or design in the infringement of any patent or other intellectual property right.
For more information on GE Polymerland, please refer to our Contact Information Page.
