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Mr. Shims
Since 1987
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Mr. Shims - Shims Specification Sheet
GENERAL POLYMERS MATERIAL DATA SHEET
Grade Huntsman PS 333
Generic Polystyrene High Impact
Manufacturer Huntsman Chemical Corporation
PROPERTY DATA UNITS
Agency Ratings/Specs FDA 21 CFR 177.1640
Appearance Natural Color
Recycled No
PHYSICAL
Density/Specific Gravity 1.0400 sp gr 23/23C
Melt Flow 8.06 @ G - 200 C/5.0 kg g/10 min
MECHANICAL
Elongation @ Break 42.1 %
Flexural Modulus 292000 psi
Flexural Strength @ Yield 5030 psi
Tensile Strength @ Break 3320 psi
IMPACT
Notched Izod Impact 1.81 ft-lb/in
THERMAL
Deflection Temp @ 264 psi 18000 F
Vical Softening 203 F
REPORT ON THE COMPRESSION OF POLYSTYRENE SHIMS

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

Sample
Stress @5%
(psi)
Stress @
10% (psi)
Yield Stress
(psi)
Strain @ End
(20%) (psi)
Modulus
(psi)
Small Black
4428
5529
4127
7079
88,680
Large Black
6448
7777
6358
8804
148,760
Small Blue
5954
9528
7487
11201
148,970
Large Blue
6296
8865
7386
10780
163,430
Small Red
7549
9088
7444
10720
176,440
Large Red
7118
10017
8246
12089
197,920

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.