1、ASTM D3945 93 W 0759530 0528424 35T(m Designation:D 3945-93 AMERICAN SOCIETY FOR TESllNG AND MATERIALS 1916 Race St Philadelphia,Pa 19103 Reprinted from the Annual Book of ASTM Standards.Copyrbht If not listed in the current combined index,will appear in the next ASTM edition An American N a t i i S
2、tandard Standard Test Methods for Shear Stability of Polymer-Containing Fluids Using a Diesel Injector Nozzle This standard is issued under the fixed designation D 3945;the number immediately following the designation indicates the year of original adoption or,in the case of revision,the year of las
3、t revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon(c)indicates an editorial change since the last revision or reapproval.N O T E-R U X S A and B of this method are in the process of being revised as separate ASTM Test Methods because tests of a series of p
4、olymer-containing fluids showed that the two procedures often give different results.1.scope 1.1 These test methods measure the percent viscosity loss at 100C of polymer-containing fluids when evaluated by either of two diesel injector apparatus procedures.Procedure A uses European Diesel Injector T
5、est Equipment and Procedure B uses Fuel Injector Shear Stability Test (FISST)equipment.The viscosity loss reflects polymer degradation due to shear at the nozzle.NOTE 1-ASTM Test Method D2603 has been used for similar evaluation of this property.It has many of the same limitations as indicated in th
6、e significance statement.No detailed attempt has been undertaken to correlate the results by the sonic and the diesel injector methods.Equipment and replacement parts are no longer available for Test Method D 2603.NOTE 2-Procedure A of this method uses test apparatus as defined in CEC G14-A-79,I P 2
7、94/76 and DIN 51382.The operational procedure i s Merent on four specific points.Procedure A evaluates hydraulic-type fluids at 30 cycles,with viscosities measured at 100C.R e s u l t s are reported for single determinations.No equipment severity correction factor is used to adjust results.1.2 This
8、standard does not purport to address all o f the safety problems,if any,associated with its use.It is the responsibility of the user o f this standard to establish appro-priate safety and health practices and determine the applica-bility o f regulatory limitations prior to use.2.Referenced Documents
9、 2.1 ASTM Standards:D445 Test Method for Kinematic Viscosity of Trans-parent and Opaque Liquids(and the Calculation of Dynamic Viscosity)z D 2603 Test Method for Sonic Shear Stability of Polymer-Containing Oils3 3.Summary of Test Method 3.1 The polymer-containing fluid is passed through a diesel inj
10、ector nozzle at a shear rate that causes the less shear stable polymer molecules to degrade.The resultant degrada-tion reduces the kinematic viscosity of the fluid under test.These test methods are under the jurisdiction of ASTM Committee D 2 on Petroleum products and Lubricants and are the direct r
11、esponsibility of Subcom-mittee W2.07 on Flow Properties.Current edition approved March 15,1993.Published August 1993.Originally published as D 3945-80.Last previous edition D 3945-8V1.*Annual Book o f ASTM Standards,Vol05.01.3 Annual Book o f ASTM Standards,Vol05.02.The reduction in kinematic viscos
12、ity,reported as percent loss of the initial kinematic viscosity,is a measure of the shear stability of the polymercontaining fluid.4.Significance and Use 4.1 Both Procedure A (using European Diesel Injector Test Equipment)and Procedure B (using Fuel Injector Shear Stability Test-FISST-equipment)of t
13、his method evaluate the percent viscosity loss for polymer-containing fluids resulting from polymer degradation in the high shear nozzle device.Minimum interference from thermal or oxidative effects would be anticipated.The two procedures exhibit essentially equal percent viscosity loss for each oil
14、 used in developing the method.Both procedures also show essen-tially comparable repeatability and reproducibility.4.2 These methods are not intended to predict viscosity loss in field service for different polymer classes or for different field equipment.However,it may be possible to establish some
15、 correlation for a specific polymer type in specific field equipment.PROCEDURE A-EUROPEAN DIESEL INJECTOR TEST 5.Apparatus 5.1 The apparatus basically consists of a fluid reservoir,a double-plunger pump with an electric motor drive,an atomization chamber with a diesel injector spray nozzle and a flu
16、id cooling vessel,installed in an area with an ambient temperature of 20 to 25C(68 to 77F).Figure A1.1,Annex A 1,shows the schematic representation of eqipment.5.1.1 Fluid Reservoir,(7)in Fig.A 1.1 Annex A 1,is open on the top,has a capacity of about 250 cm3,has a 45-mm(1.772-in.)inner diameter and is calibrated in 25-cm3 intervals.It is fitted with an internal fluid distributor detailed as Fig.A 1.2.A 40-mm(1 S75-in.)diameter watch glass with serrated edges is an acceptable distributor plate.Th
