Taber 5135 Operating Instructions Manual page 36

Wheels and Load: CS-0 (S-32) and S-42
sandpaper strip with 1000 gram load.
Evaluation: Visual method, wear through of the
decorative layer.
Remark: S-42 sandpaper strips must be changed on a
frequent basis (i.e. every 200 or 500 cycles)
Figure 74
Electroplate – Chrome over Nickel
Specimen: S-16 specimen plates, plated in the
usual fashion including the chrome flash.
Wheels and Load: CS-10 Calibrase with 500 or
1000 gram load.
Evaluation: Visual method, by comparison of the
number of wear cycles necessary for penetration
to the nickel coating with that of a standard
specimen material tested
conditions.
Remark: The color difference between the nickel and
chrome is so slight that it is necessary to prepare and use an
indicator solution that will blacken the nickel but not attack
the chrome. At intervals during the test, moisten the wear
path with the solution applied with a cotton swab on the end
of a stick. Discoloration indicates that the abrading wheels
have penetrated the chrome deposit. Clean the solution from
the specimen before resuming the test.
Electroplate – Nickel over Brass (or
Copper)
Specimen: S-16 specimen plates, plated in the
usual fashion.
Wheels and Load: CS-10 Calibrase with 500 or
1000 gram load.
Evaluation: Visual method, by comparison of the
number of wear cycles necessary for penetration
to the brass (or copper) with that of a standard
specimen material tested
conditions.
under identical
under identical
35
Remark: The contrasting color of copper permits the end
point to be detected visually without an indicator solution. If a
sharper indication is desired, a formula that discolors copper
but not nickel may be used.
Electroplate – Nickel Plated Steel
Specimen: S-16 specimen plates, plated in the
usual fashion.
Wheels and Load: CS-10 Calibrase with 500 or
1000 gram load.
Evaluation: Visual method, by comparison of the
number of wear cycles necessary for penetration
to the steel with that of a standard specimen
material tested under identical conditions.
Remark: Use copper sulfate as an indicating solution.
Glass – Scratch Resistance
Specimen: 100 mm
(4 inch)
center hole.
(0.25 inch)
Wheels and Load: CS-17 with 1000 gram load.
Evaluation: Comparison of the number of wear
cycles necessary to produce an equal degree of
haze or scratching with that of a standard of
similar material tested under identical conditions.
Remark 1: Reface wheels with fine side of ST-11 refacing
stone.
Remark 2: For transparent specimens, care must be taken to
mount the test specimen such that the bottom surface is not
scratched nor subjected to abrasion.
Glass – Abrasion Resistance
Specimen: 100 mm
(4 inch)
center hole. Must have a flat, even
(0.25 inch)
surface and run true.
Wheels and Load: CS-10F with 500 gram load.
Alternatively, H-18 or H-10 Calibrade wheel with
500 or 1000 gram load, which ever combination
is best suited to the desired rate of abrasion.
Evaluation: Change in the percentage of
transmitted light and percent haze, before and
after exposure to abrasion as measured by a
hazemeter.
Remark 1: Reface wheels with fine side of ST-11 refacing
stone.
Remark 2: For transparent specimens, care must be taken to
mount the test specimen such that the bottom surface is not
scratched nor subjected to abrasion.
Remark 3: The use of an oversized nozzle is recommended
[11mm (0.4375 inch) opening vs. the nominal 8mm
inch)].
Labels
Specimen: Affix to glass or metal specimen
plates.
5135 / 5155 Operating Instructions ver 1.1
square with 6.35 mm
square with 6.35 mm
(0.3125