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Use of PTFE or other low-friction sheets between the test machine and specimen. A spherical or self-aligning test fixture, which can minimize friction by applying the load more evenly across the specimen's surface. Three methods can be used to compensate for the effects of friction on the test result: Correction formulas; Geometric extrapolation
Rulon 1337, tan, FDA compliant with low coefficient of friction and excellent chemical resistance; Rulon 1410, gold, highly elastic; Rulon 1439, white, FDA compliant for use in submerged applications with low wear characteristics; Rulon A has a 1000 fold increase in wear resistance as compared to PTFE. However, it machines much like PTFE.
The friction coefficient is an empirical (experimentally measured) structural property that depends only on various aspects of the contacting materials, such as surface roughness. The coefficient of friction is not a function of mass or volume. For instance, a large aluminum block has the same coefficient of friction as a small aluminum block.
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Matrix and filler both contribute to wear resistance. In general a filler is selected to decrease the friction coefficient of the material. Particle size and shape are contributing factors. Smaller particle size increase wear resistance because they cause less debris.
This theory is exact for the situation of an infinite friction coefficient in which case the slip area vanishes, and is approximative for non-vanishing creepages. It does assume Coulomb's friction law, which more or less requires (scrupulously) clean surfaces. This theory is for massive bodies such as the railway wheel-rail contact.
Cardboard is a generic term for heavy paper-based products. The construction can range from a thick paper known as paperboard to corrugated fiberboard which is made of multiple plies of material. Natural cardboards can range from grey to light brown in color, depending on the specific product; dyes, pigments, printing, and coatings are available.
The coefficient of friction of plastics is usually measured against polished steel. [36] PTFE's coefficient of friction is 0.05 to 0.10, [27] which is the third-lowest of any known solid material (aluminium magnesium boride (BAM) being the lowest, with a coefficient of friction of 0.02; diamond-like carbon being second-lowest at 0.05).
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