1 2 two test methods are described.
Gravity test plastic sheet.
And the determination of the density and relative density of non cellular plastics in the form of sheet film tube moulded objects and moulding powders granules and pellets.
About this quiz worksheet.
1 2 1 test method a for testing solid plastics in water and.
Standard test method for resistance of plastic films to extraction by chemicals.
The mass of the specimen of the solid plastic in air is first measured.
By design surface tests such as the plastic sheet test only inform about moisture conditions at the slab s surface.
This test is often seen with the designation astm d792.
One of the astm test methods for plastic commonly seen on data sheets is the test for density and specific gravity sg.
1 1 these test methods describe the determination of the specific gravity relative density and density of solid plastics in forms such as sheets rods tubes or molded items.
There are chiefly two test methods are involved.
Standard test methods for impact resistance of plastic film by the free falling dart method.
Test method a for testing solid plastics in water and test method b for testing solid plastics in liquids other than water.
Standard specification for nonrigid vinyl chloride plastic film and sheeting.
Specific gravity information.
You ll need to use a container that is deep enough to allow a hydrometer to float.
It is then immersed in a liquid and its apparent mass upon immersion is measured.
From falling apples to rising tides everything is affected by gravity.
Describe the determination of the specific gravity relative density and density of solid plastics in forms such as sheets rods tubes or molded items.
Astm d792 98 describes the determination of the specific gravity relative density and density of solid plastics in forms such as sheets rods tubes or molded items.
Complete this quiz worksheet to discover how much you know about this powerful force of nature.
To test the specific gravity of liquids first pour a sample of liquid into a container.
Specific gravity the ratio of the weight of the molded piece as compared to the weight of an equal volume of water astm d792 polybutylene 0 60 polymethylpentene 0 83 ethylene propylene 0 86 polypropylene 0 90 0 92 polyethylene ldpe 0 91 0 93 lldpe 0 91 0 94 hdpe 0 96 0 97 polybutene 0 91 0 92.
Next make sure the liquid is the same temperature that the hydrometer is calibrated to or you will get an incorrect reading.
Density refers to the mass per unit volume of a material whereas sg refers to a measure of the ratio of mass of a given volume of material at 23 c to the same volume of deionized water.
