Six different designs of polystrene shims were submitted for an evaluation of compressive properties. The tests were conducted in accordance with ASTM D 695. Flat rectangular samples were prepared from sections of molded parts where the surface exhibited the greatest degree of regularity and therefore afforded good overall contact with the compression platens over the entire part.
Stress levels of 25-40% were used to ensure that the material went through the yeild point. This is clearly identified in the graphs as the inflection point between the proportional region and the area of decreased slope.
The program identifies the stress at strain levels of 5% and 10%. The yield and endpoint can be identifed visually with the cursor and are included in the summary of average values given below.

Summary of Compressive Test Results

No obvious pattern of properties as a function of color, wall thickness, or foaming agent could be determined from this data. However, it is apparent that all of the products have yield stresses well in excess of 2000 psi.
Jan-04

Back to Product Info