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ASTM D7109-20a
Standard Test Method for Shear Stability of Polymer-Containing Fluids Using a European Diesel Injector Apparatus at 30 Cycles and 90 Cycles (Includes all amendments And changes 5/19/2022).
NORMA vydaná dňa 1.6.2020
Informácie o norme:
Označenie normy: ASTM D7109-20a
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.6.2020
Kód tovaru: NS-997623
Počet strán: 9
Približná hmotnosť: 27 g (0.06 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM D7109-20a :
Keywords:
diesel injector apparatus, mechanical shear stability, polymer containing fluid, viscosity loss,, ICS Number Code 17.060 (Measurement of volume, mass, density, viscosity)
Doplňujúce informácie
| Significance and Use | ||||||||||||
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5.1 This test method evaluates the percent viscosity loss of fluids resulting from physical degradation in the high shear nozzle device. Thermal or oxidative effects are minimized. 5.2 This test method may be used for quality control purposes by manufacturers of polymeric lubricant additives and their customers. 5.3 This test method is not intended to predict viscosity loss in field service in different field equipment under widely varying operating conditions, which may cause lubricant viscosity to change due to thermal and oxidative changes, as well as by the mechanical shearing of polymer. However, when the field service conditions, primarily or exclusively, result in the degradation of polymer by mechanical shearing, there may be a correlation between the results from this test method and results from the field. |
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| 1. Scope | ||||||||||||
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1.1 This test method covers the evaluation of the shear stability of polymer-containing fluids. The test method measures the viscosity loss, in mm2/s and percent, at 100 °C of polymer-containing fluids when evaluated by a diesel injector apparatus procedure that uses European diesel injector test equipment. The viscosity loss reflects polymer degradation due to shear at the nozzle. Viscosity loss is evaluated after both 30 cycles and 90 cycles of shearing. Note 1: This test method evaluates the shear stability of oils
after both 30 cycles and 90 cycles of shearing. For most oils,
there is a correlation between results after 30 cycles and results
after 90 cycles of shearing, but this is not universal.
Note 2: Test Method D6278 uses essentially the same procedure
with 30 cycles only instead of both 30 cycles and 90 cycles. The
correlation between results from this test method at 30 cycles and
results from Test Method D6278 has not been
established.
Note 3: Test Method D2603 has been used for similar
evaluation of shear stability; limitations are as indicated in the
significance statement. No detailed attempt has been undertaken to
correlate the results of this test method with those of the sonic
shear test method.
Note 4: This test method uses test apparatus as defined in CEC
L-14-A-93. This test method differs from CEC-L-14-A-93 in the
period of time required for calibration.
Note 5: Test Method D5275 also shears oils in a diesel
injector apparatus but may give different results.
Note 6: This test method has different calibration and
operational requirements than withdrawn Test Method D3945.
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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| 2. Referenced Documents | ||||||||||||
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