NB/SH/T 0848-2010 Determination of Apparent Viscosity of Polyethylene Wax

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: NB/SH/T 0848—2010
• Chinese title: Determination of Apparent Viscosity of Polyethylene Wax
• English title: Standard test method for determining the apparent viscosity of polyethylene wax
• Replacement relationship: This standard is first published (no replaced standard is provided in the available source)
• Adoption relationship: Modified adoption of ASTM D1986-91 (2007) "Determination of Apparent Viscosity of Polyethylene Wax"
• Publication/implementation: published on 2011-01-09, implemented on 2011-05-01
• Issuing authority: National Energy Administration
• Secretariat: Subcommittee on Petroleum Wax Products of the National Technical Committee for Standardization of Petroleum Products and Lubricants
• Drafting organization: Fushun Research Institute of Petroleum and Petrochemicals, China Petroleum & Chemical Corporation
• Main drafters: Wei Yadong, Yang Shaoquan (names require confirmation against the source standard (source-text extraction))

2. Scope of application and non-applicability

• 1.1 This standard specifies a method for determining the apparent viscosity of polyethylene wax using a Brookfield LVT or LVF type viscometer and a heating system.
• 1.2 This standard may involve certain hazardous materials, equipment, and operations, but it is not intended to address all safety issues associated with them. Therefore, before using this standard, users are responsible for establishing appropriate safety and protective measures and determining the applicability of relevant regulations.
• Non-applicable scope: not provided in the available source.

3. Method principle

Not provided in the available source (the main text of the standard does not have a separate "Principle" section; from Chapter 8 it can be seen that: at a specified temperature, measurement is performed with a Brookfield viscometer and spindle, the average of scale readings is multiplied by the factor given in the instrument manual and converted to mPa·s).

4. Reagents and materials (purity / preparation)

• Standard reference liquid for calibration: a liquid at a temperature of 149 ℃ (300 °F) with a viscosity not exceeding 15000 mPa·s may be used (6.2).
• Other reagents and materials: not provided in the available source.

5. Apparatus and equipment

• Brookfield temperature control system, with models LVT, LVF type viscometer and spindle No. SC4-31 (Chapter 5).
• Sample container, insulating cover, coupling screw, positioning ring (Chapter 7, specific specifications not provided in the available source).
• Thermometer: shall comply with the relevant requirements in GB/T 514 (6.3, specific clause number requires confirmation against the source standard (source-text extraction)).
• Heating system (1.1).

6. Recommended operating conditions

• Temperature control: control capability is 0.5% of the target temperature value (at 175 °F it is ±0.5 °F) (6.3, original wording requires confirmation against the source standard (source-text extraction)).
• Test temperature: preheat the sample container to 140 ℃; if the polyethylene wax (conditions related to melting point/softening point, original wording requires confirmation against the source standard (source-text extraction)) is 5 ℃, then the set temperature should be 150 ℃ (7.2, original wording requires confirmation against the source standard (source-text extraction)).
• Rotation speed: start the viscometer at the lowest speed, and after the temperature reaches equilibrium select a speed (r/min) that produces a reading closest to the midpoint of the 5 unit scale of 10 (Chapter 7, original wording requires confirmation against the source standard (source-text extraction)).
• Rotation time: before engaging the indicator clutch, let the spindle rotate for 15 min; stop the motor and record the scale reading, restart the motor and rotate for at least 5 revolutions before reading again, repeat until 3 consecutive readings do not differ by more than 0.5 units (Chapter 7).
• Spindle position: the straightening end of the spindle is 28 mm above the top of the sample container (the original unit expression requires confirmation against the source standard (source-text extraction)), with the rear end of the positioning ring in contact; the liquid level should reach 0.6 mm~3 mm of the spindle cup (Chapter 7, original wording requires confirmation against the source standard (source-text extraction)).

7. Sampling and sample preparation

• Take about (original numerical value requires confirmation against the source standard (source-text extraction)) mL of sample into the sample container, and melt the sample in a preheated 140 ℃ sample container (7.1, 7.2).
• Heat the sample container with insulating cover for 15 min, avoiding prolonged heating and oxidation effects on the sample (7.2).
• If the liquid level is not within the specified range, then (add/reduce) sample (Chapter 7, original wording requires confirmation against the source standard (source-text extraction)).

8. Analytical procedure

• 8.1 Prepare and heat the test sample in accordance with 7.1, 7.2.
• 8.2 Insert the thermometer, connect the spindle to the coupling screw; lower the leveled viscometer, insert the spindle into the sample container until the straightening end is 28 mm above the top of the sample container and the rear end of the positioning ring is in contact; place the insulating cover on the sample container (Chapter 7).
• 8.3 Start the viscometer at the lowest speed and wait for the temperature to reach equilibrium; after equilibrium is reached, select a speed (r/min) that produces a reading closest to the midpoint of the 5 unit scale of 10 (Chapter 7).
• 8.4 Before engaging the indicator clutch, let the spindle rotate for 15 min; stop the viscometer motor and record the scale reading; restart the motor and rotate for at least 5 revolutions before reading again; repeat until 3 consecutive readings do not differ by more than 0.5 units (Chapter 7).
• 8.5 Turn off the viscometer, remove the insulating cap, and raise the viscometer and spindle (Chapter 7).

9. Qualitative and quantitative determination and calculation formula

• Multiply the average value obtained from the readings in Chapter 8 by the factor given in the instrument operating manual and convert to mPa·s (millipascal·second), thereby obtaining the apparent viscosity (Chapter 8).
• Specific calculation formula: not provided in the available source (only textual description, no formula number).

10. Precision

• Precision: when the same operator uses the same model (LVT or LVF) viscometer under the same conditions, the dial reading (95%) shall not exceed ±0.3 (original unit/complete wording requires confirmation against the source standard (source-text extraction)).
• Bias: there is no bias in the apparent viscosity of polyethylene wax determined by this method, because the viscosity value is determined only by this test method (Chapter 10).

11. Report

• Report (the original Chapter 9 is titled "Report"; the body content source-text extraction is missing, requires confirmation against the source standard (source-text extraction)).
• From the keywords and body text of Chapter 11, the report should include instrument model, spindle number, and rotation speed (original wording requires confirmation against the source standard (source-text extraction)).

12. Referenced documents

• GB/T 514 Technical conditions for glass liquid thermometers for petroleum product testing
• ASTM D1986-91 (2007) "Determination of Apparent Viscosity of Polyethylene Wax" (modified adoption)

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 Q&A