Abrasive testing

Ablators, in tumescent Ablators, melting Ablators, subliming Abortifacients Abortion, habitual AB polyamides Abrasion index Abrasion tests Abrasive... 

Taber abrasion test using CS-17 wheel and 1000-gload for 1000 cycles. 

Table 5. Abrasion Tests for Artificial Turf, Effective Pile Loss, %...

The 3M Abrasion Test (51) is used to assess the durabUity of a protective fluorochemical finish by evaluating its resistance to abrasion and wear. The surface is abraded with an AATCC crockmeter fitted with sandpaper. 

Abschleifversuch, m. abrasion test, abschleimen, v.t. rid of slime, slime, clarify (sugar). 

Resistance to abrasion The resistance to abrasion of electroless nickel-phosphorus hardened to 600 Hy, assessed by Taber abrasion tests, has been found to be double that of electroplated nickel However, electroless nickel coatings are not suitable for applications where two electroless nickel surfaces rub together without lubrication unless the values of hardness are made to differ by over 200 Hy units. Galling of aluminium, titanium or stainless steel may be overcome by applying electroless nickel to one of the two mating surfaces. 

This property is very hard to define, as articles may be subjected to very varied forms of abrasion, and in general a given ceramic body will react quite differently to different types of abrasion. This is a question on which the manufacturer should be able to give considerable guidance. Many types of standard abrasion test have been proposed, but none has proved satisfactory and experience must continue to be the main guiding factor. 

Abrasion tests In these tests the end point is normally taken as the amount of abrasion required to penetrate the coating. The results thus reflect the strength of the coating, its cohesion, and in some cases its adhesion to the basis metal as well as resistance to abrasion. 

There is usually more than one test method to determine a performance because each test has its own behavior and meaning. As an example there are different tests used to determine the abrasion resistance of materials. There is the popular Taber abrasion test. It determines the weight loss of a plastic or other material after it is subjected to abrasion for a prescribed number of the abrader disk rotations (usually 1000). The abrader consists of an idling abrasive speed controlled rotating wheel with the load applied to the wheel. The abrasive action on the circular specimen is subjected to a rotary motion. 

Other abrasion tests have other type actions such as back and forth motion, one direction, etc. These different tests provide different results that can have certain relations to the performance of a product that will be subjected to abrasion in service. 

The framed cells of the laboratory abrasion table show by inspection two testing conditions for which a high correlation exists between road ratings and a single laboratory abrasion test condition. It would have been very difficult to pick one of these by chance. 

Road wear is force controlled. This is a fundamental difference to slip-controlled laboratory abrasion test machines or wear tests with a trailer as described above. In force-controlled events the abrasion loss is inversely proportional to the stiffness of the tire whilst under slip control the abrasion is proportional to its stiffness (see Equations 26.18a and 26.19a). 

A similar situation exists for the shp speeds (Figure 26.82). They are lower for tmcks than for passenger tires but both are within the slip speed range of the laboratory abrasion tests. 

The link between laboratory abrasion methods and road tests is now well established so that further research can concentrate on further elucidation of the basic underlying processes. This concerns particularly the interaction between filler systems and polymers, which is continuously expanding through both new polymers and new fillers. But now the link does not extend from a basic experiment to tire road testing. It can be limited to a laboratory abrasion testing method and suitable basic experiments. 

The wear resistance of rubber compounds is of great practical importance for tires, but the mechanisms involved in tire wear are multiple and may vary depending on the vehicle, the driving conditions, and other extraneous variables. Many attempts have been made to develop laboratory test methods to simulate tire wear under various conditions. Whilst none can fully replicate road wear, various laboratory abrasion tests can be used to provide an indicator of wear resistance of tires under certain conditions. 

C special abrasion test with abrasive powders haze after abrading. 

Despite the little experimental data, there are two models available in the literature. Adams etal. (1992) considered dense phase conveying. They tried to predict the amount of attrition as a function of conveying distance by coupling a Monte Carlo simulation of the pneumatic conveying process with data from single-particle abrasion tests. Salman et al. (1992) focused on dilute phase conveying. They coupled a theoretical model that predicts the particle trajectory with single particle impact tests (cf. Mills, 1992). 

It follows that there cannot be a universal standard abrasion test method for plastics and the test method and test conditions have to be chosen to suit the end application. Also, great care has to be taken if the test is intended to provide a significant degree of acceleration. 

The rate of abrasion is measured simply by loss of thickness or mass. However, laboratory abrasion tests are notorious for not correlating with service. The term abrasion resistance... 

ISO 18064 2003 Thermoplastic elastomers - Nomenclature and abbreviated terms ISO 23794 2003 Rubber, vulcanized or thermoplastic - Abrasion testing - Guidance ISOAVD 10350-3 Plastics - Acquisition and presentation of comparable single-point data -Part 3 Thermoplastic elastomer materials... 

Transparency, gloss, color, refractive index, and reflectance are the properties normally associated with aesthetics of plastic materials. In some areas, changes in optical properties, increases in haze after abrasion testing (285), color differences after weathering, and birefringence analysis of residual stress within a transparent part (286) are all used to measure the effects of applied stresses. Measurements of color, gloss, refractive index, and haze apply to many products beyond plastics and use similar techniques. Reference should be made to this general topic for detailed information (see Color). 

Abrasion tests -for artificial turf [RECREATIONAL SURFACES] (Vol 20)... 

---