US 12,405,197 B2
Method for evaluation of chemical resistance of thermoplastics
Mike Zettel, Bloomfield, MD (US); Yubiao Liu, Johnson City, TN (US); James Hicks, Atlanta, GA (US); Kay Bernhard, Darmstadt (DE); Pooja Bajaj, Fairfield, CT (US); Mark Lamont, Port Jefferson, NY (US); and Ellen Turner, Kingsport, TN (US)
Assigned to Healthcare Surfaces Summit, Stevensville, MT (US)
Filed by Healthcare Surfaces Summit, Stevensville, MT (US)
Filed on Apr. 17, 2023, as Appl. No. 18/135,420.
Claims priority of provisional application 63/332,270, filed on Apr. 18, 2022.
Prior Publication US 2023/0341306 A1, Oct. 26, 2023
Int. Cl. G01N 3/303 (2006.01); G01N 3/04 (2006.01); G01N 33/44 (2006.01)
CPC G01N 3/303 (2013.01) [G01N 3/04 (2013.01); G01N 33/442 (2013.01); G01N 2203/001 (2013.01); G01N 2203/0039 (2013.01); G01N 2203/024 (2013.01); G01N 2203/0252 (2013.01); G01N 2203/0264 (2013.01); G01N 2203/0476 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of testing a thermoplastic material for compatibility with a chemical comprising the steps of:
a. selecting a thermoplastic material to be tested;
b. selecting a chemical for testing with the selected thermoplastic material;
c. determining a modulus of the thermoplastic material;
d. selecting a geometry for specimens of the thermoplastic material including a thickness;
e. selecting a jig having a radius of curvature based on the thickness of the specimens and a strain based on the modulus of the thermoplastic material;
f. placing a plurality of test specimens of the thermoplastic material on the jig;
g. placing a plurality of control specimens of the thermoplastic material on the jig;
h. exposing outer surfaces of the test specimens to the selected chemical for a first predetermined period of time, but not exposing the control specimens to the chemical;
i. removing both the test specimens and the control specimens from the jig, and waiting for a second predetermined period of time;
j. testing each of the test specimens for impact according to ASTM D 6110 with the modification of placing the specimen upon an impact pendulum such that a plane defined by the specimen has an orientation that is perpendicular to a plane defined by a base of the pendulum with the exposed outer surface of the specimen facing away from a pendulum head, then striking the specimen with the pendulum head to obtain an impact result, and then recording the impact result;
k. testing each of the control specimens for impact according to ASTM D 6110 with the modification of placing the specimen upon an impact pendulum such that a plane defined by the specimen has an orientation that is perpendicular to a plane defined by a base of the pendulum before striking the specimen with the pendulum head to obtain an impact result, and then recording the impact result;
l. averaging the impact results of the test specimens;
m. averaging the impact results of the control specimens; and
n. comparing the average test impact results with the average control impact results.