SH/T 0066-2002 Engine coolant foam tendency determination method (glassware method)

AI-translated method card — human verification pending. This is not an official translation of the standard. Unclear source values remain unverified; check the original standard and product certificate before use.

Card type: Test method

1. Method number / full title / English name / replacement relationship

• Standard number: SH/T 0066-2002
• Chinese title: Engine coolant foam tendency determination method (glassware method)
• English title: Standard test method for foaming tendencies of engine coolants in glassware
• Replacement relationship: replaces SH/T 0066-91 (foreword: revision of SH/T 0066-91; the first page of the main text is marked "replaces SH/T 0066-91")
• Adoption relationship: equivalent adoption of ASTM D 1881-97 (foreword)
• Publication/implementation: published on 2002-05-31, implemented on 2002-07-01; issuing body: State Economic and Trade Commission
• First publication: year 1991 (foreword)

2. Scope of application and non-applicability

• 1.1 This standard specifies a method for determining the foam tendency of engine coolant using glassware under controlled laboratory conditions of a certain temperature and aeration.
• 1.2 This standard involves certain hazardous materials, operations and equipment, but it is not intended to address all safety issues associated with them. Therefore, users should establish appropriate safety and protective measures before using the standard, and determine applicable management systems.
• Non-applicable scope: not provided in the available source.

3. Method principle

• 4 Method summary: keep a mixed solution of coolant and water at constant temperature under the conditions of 88℃±1℃, aerate with a constant air flow for 5min, and measure its foam volume and foam disappearance time.
• 5 Significance and use: in practice, this method is usually used to distinguish coolants with excessive foam tendency, so as to screen coolants suitable for further analysis to determine their service performance.
• Note (under clause 5): during use of the coolant, as time passes or the coolant becomes contaminated, its foam tendency will increase, and a certain pressure should be maintained to suppress foam formation in the coolant.

4. Reagents and materials (purity / preparation)

• 7.1 Water purity: unless otherwise specified, the water used in the standard is grade two water as specified in GB/T 6682.
• 7.2 Acetone: analytical reagent, used to rinse and dry test apparatus. Warning: acetone is extremely flammable.
• 7.3 Reference coolant: unless otherwise stated, reference coolant means a coolant that complies with the standard ASTM D 3585 and contains no antifoaming agent.
• 7.4 Cleaning solution: refers to acidic or alkaline cleaning solutions used to clean glass containers between tests, selected according to the specific situation; for example, chromic acid cleaning solution and sodium (potassium) hydroxide alcohol solution are commonly used acidic and alkaline cleaning solutions respectively. Warning: cleaning solutions are strong oxidants or strong acids or strong bases, and contact with skin, eyes, and clothing should be avoided; do not inhale the vapor; preferably operate in a fume hood.
• 8.1 Prepare the concentrate of the reference coolant into an aqueous solution with a concentration of 33%(V/V).
• 8.2 Using the glass beaker used to prepare the reference coolant, prepare the coolant to be tested into an aqueous solution containing 33%(V/V) concentrate; before preparing the solution, the glass beaker should first be rinsed clean with water. The additive concentrate is diluted with water to the recommended use concentration. Sampling and preparation of the test sample shall be carried out according to SH/T 0065 to ensure that the prepared test sample contains all insoluble substances and is representative.

5. Apparatus and equipment

• 6.1 Container: 500mL graduated heat-resistant glass graduated cylinder, with a minimum scale of 5mL, diameter 45mm～50mm, length 380mm.
• 6.2 Water bath: 4000mL glass container, at least capable of immersing the 350mL scale line of the 500mL graduated cylinder below the liquid surface.
• 6.3 Heater: an electric heater capable of maintaining the bath temperature at 88℃±1℃.
• 6.4 Gas diffusion head: outer diameter 25.4mm, a sintered crystalline alumina sand core sphere. When measured according to GB/T 12579 appendix A, it shall meet the following conditions:
  • Maximum pore diameter/μm: not greater than 80
  • Permeability under pressure 2.45kPa/(mL/min): 3000～6400
• 6.5 Thermometer: meets the requirements of appendix A, or a general thermometer with a temperature range of 0℃～100℃ (the thermometer range is unclear in the source transcription and requires verification), with a division value of 1℃.
• 6.6 Air source: capable of providing a clean and dry air source, free of grease and other contamination, and capable of ensuring the specified gas flow rate through the diffusion head.
• 6.7 Stopwatch: division value 0.2s.
• 6.8 Three-way valve: installed on the pipeline immediately connected to the air inlet of the aeration tube at the metered air source.
• 6.9 Apparatus and equipment installation is shown in Figure 1.
• Figure 1 Schematic diagram of the glassware method foam tendency determination apparatus; legend: 1— three-way valve; 2— thermometer; 3—500mL graduated cylinder; 4— water bath; 5— heater; 6,11— gas diffusion head; 7,9— aeration tube; 8— plastic connecting tube; 10— lead gasket.
• Appendix A (normative appendix) Thermometer specifications, Table A1:
  • Range/℃: -20～150
  • Immersion depth/mm: 76
  • Minimum division value/℃: 1
  • Long-line division value/℃: 5
  • Numeric scale/℃: 10
  • Scale error/℃: not exceeding 0.5
  • Overall length/mm: 317～327
  • Stem diameter/mm: 6.0～7.0
  • Mercury bulb length/mm: 19～25 (requires confirmation against the source standard (source-text extraction): the original text is "l n 19 -25")
  • Mercury bulb outer diameter/mm: 5.0～6.0
  • Distance from the bottom of the mercury bulb to the 0℃ scale/mm: 111～118
  • Scale range length/mm: 170～200 (requires confirmation against the source standard (source-text extraction): the original unit is ".")
  • Expansion chamber allowed to be heated to/℃: 200

6. Recommended operating conditions

• 9.1 Test temperature: during the test, the constant-temperature water bath liquid level is maintained at the 350mL～375mL scale mark of the graduated cylinder, and the test solution temperature is maintained at 88℃±1℃; this temperature is suitable for both high-boiling and low-boiling coolants.
• 9.2 Air flow rate: maintained at 1000mL/min±25mL/min.
• 9.3 Number of tests: the reference coolant is used to determine whether the glassware and test apparatus used have residual antifoaming agent. If the measured foam volume of the reference coolant is greater than 250mL and the foam disappearance time is greater than 8s, discard the reference coolant in the glassware, rinse it clean with water, and prepare for the test. Each sample is tested three times repeatedly, each time using a newly prepared test sample according to clause 8.2, and before each test the graduated cylinder and gas diffusion head used shall be thoroughly cleaned. The graduated cylinder is cleaned successively with tap water, cleaning solution, and water; the gas diffusion head is successively immersed in acetone and water, and both are repeatedly cleaned by suction and pressure; all test apparatus shall be fully rinsed with water before the test.
• Note (under 9.3): before each test, scrub the glass graduated cylinder, aeration tube, and gas diffusion head to remove residual antifoaming agent and glass cleaning solution from the previous test, because these residues will affect the reproducibility of the test.

7. Sampling and test sample preparation

• 8.2 Sampling and preparation of the test sample shall be carried out according to SH/T 0065 to ensure that the prepared test sample contains all insoluble substances and is representative.
• 8.1 Prepare the reference coolant concentrate into an aqueous solution of 33%(V/V).
• 8.2 Prepare the coolant to be tested into an aqueous solution containing 33%(V/V) concentrate; before preparing the solution, rinse the glass beaker clean with water; dilute the additive concentrate with water to the recommended use concentration.
• Other sampling details: not provided in the available source.

8. Analytical procedure

• 10.1 Place the graduated cylinder containing the 145mL test sample into the constant-temperature bath, heat the test sample to 88℃±1℃, immerse the gas diffusion head into the test sample so that the position of the gas diffusion head just touches the bottom of the graduated cylinder and is located at the center of the graduated cylinder (see Figure 1); when the test sample temperature in the graduated cylinder reaches the test temperature, read the initial volume of the test sample, accurate to 5mL.
• 10.2 Connect the air source, turn the three-way valve so that the gas flows to the aeration tube, and use a gas flow meter capable of accurately measuring the air flow or other suitable instrument to adjust the air flow rate to 1000mL/min±25mL/min.
• 10.3 If the test sample evaporates and its volume decreases before aeration, add water to make up to the initial volume and bring the test sample temperature to the specified temperature.
• 10.4 When the first bubble appears in the test sample, start timing and aerate for 5min.
• 10.5 At the end of 5min, immediately read the volume of the risen foam, accurate to 5mL, and subtract the initial volume of the liquid after immersion of the gas diffusion head, as the foam volume (mL).
• 10.6 Turn the three-way valve to shut off the air source and place the aeration tube inlet in the vented state, and record the time from stopping the air supply until the foam gradually breaks and an "eye"-shaped area appears on the liquid surface, as the foam disappearance time (s), accurate to 0.2s.
• Adoption note (under 10.4): the standards ASTM D 1881-97 do not describe the placement position of the gas diffusion head or bringing the temperature to the test temperature; this standard still adopts the relevant descriptions in the standards SH/T 0066-91.

9. Qualitative and quantitative determination and calculation formulas

• Foam volume (mL): at the end of 5min, read the volume of the risen foam, accurate to 5mL, and subtract the initial volume of the liquid after immersion of the gas diffusion head (10.5).
• Foam disappearance time (s): the time from stopping the air supply until the foam gradually breaks and an "eye"-shaped area appears on the liquid surface, accurate to 0.2s (10.6).
• Term 3.1 foam disappearance time break time: the time from stopping the air supply until the foam breaks and an "eye"-shaped area appears on the liquid surface.
• Term 3.2 "eye"-shaped area eye: the foam-free area on the liquid surface surrounded by foam adhering to the wall of the graduated cylinder.
• Determination result: take the arithmetic mean of the three results as the determination result (11).
• Calculation formula: not provided in the available source.

10. Precision

• Not provided in the available source.

11. Report

• 11 Report: take the arithmetic mean of the three results as the determination result. The test results may be expressed in the following form.
• Table 1 Foam tendency test result record table: test number (1, 2, 3, average value); foam volume/mL; foam disappearance time/s.

12. Reference documents

• GB/T 6682 Water specifications and test methods for analytical laboratory use
• GB/T 12579 Determination of foaming characteristics of lubricating oils
• SH/T 0065 Sampling of test samples of engine coolant or rust inhibitor and preparation of their aqueous solutions
• ASTM D 3585 Reference liquid for coolant testing
• ASTM D 1881-97 (foreword, equivalent adoption)
• SH/T 0066-91 (foreword, replaced)

13. Source and verification

This page is an AI translation of the available Chinese method card. Human verification is pending. It is not an official translation of the standard. Check the source standard and product certificate before use.

14. Quick reference for questions and answers