H-4253
Plastic Limit Set
Perform plastic limit tests in accordance with specifications.
H-4253.1
Plastic Limit Plate
Glass plate with ground finish on one side and seamed edges.
H-4262
Plastic Limit Roller
Easily repeatable mechanical technique produces consistent test results and saves time.
H-4262P
Adhesive Paper
Pad of 50 sheets of special adhesive backed paper for Plastic Limit.
Plastic Limit Testing Tools
Plastic limit is a test that involves rolling out a thread of the fine portion of a soil on a flat, non-porous surface. The procedure is defined in ASTM Standard D4318. If the soil is at a moisture content where its behavior is plastic, this thread will retain its shape down to a very narrow diameter. The sample can then be remolded and the test repeated. As the moisture content falls due to evaporation, the thread will begin to break apart at larger diameters. The plastic limit is defined as the moisture content where the thread breaks apart at a diameter of 3.2 mm (about 1/8 inch). A soil is considered non-plastic if a thread cannot be rolled out down to 3.2 mm at any moisture possible.
For more information about Humboldt's Atterberg Limits products, or to learn more about liquid limit and plastic limit of soils, download the Atterberg Limits Testing datasheet, call us at 1.800.544.7220 or use our Ask Humboldt form.