GB/T 6538-2022 Determination of apparent viscosity of engine oils by cold cranking simulator 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

Note: This card is compiled based on the provided source-text extraction text. The text contains severe garbling and character misalignment; numerous clause numbers, values, and table contents cannot be reliably reconstructed. Wherever confirmation is impossible, it is marked "requires confirmation against the source standard (source-text extraction)" or "not provided in the available source", without inferential completion.

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

• Standard number: GB/T 6538—2022 (inferred from file name GBT-6538-2022 and the year number in the main text; requires confirmation against the source standard (source-text extraction))
• Chinese title: Determination of apparent viscosity of engine oils by cold cranking simulator method (inferred from file name)
• English title: The visible fragment in the source text is Standard Test Method for Apparent Viscosity of Engine Oils ... Cold Cranking Simulator (the source text is severely garbled; the complete English title requires confirmation against the source standard (source-text extraction))
• Supersession relationship: The source text contains wording such as "supersedes GB/T 6538—20□□"; the specific superseded version number requires confirmation against the source standard (source-text extraction)

2. Scope of application and non-applicability

• The source text shows a "Scope" section heading (the corresponding clause number requires confirmation against the source standard (source-text extraction)).
• The source text contains wording such as "This document applies to...", but the specific scope text is covered by garbling and requires confirmation against the source standard (source-text extraction).
• Non-applicable scope: not provided in the available source.

3. Method principle

• The "Principle" section exists in the source text, but the body is covered by garbling; only terms related to the cold cranking simulator and apparent viscosity determination can be recognized. The specific principle statement requires confirmation against the source standard (source-text extraction).

4. Reagents and materials (purity / preparation)

• The source text contains a section heading such as "Reagents and materials"; the specific reagent names, purities, and preparation methods are all covered by garbling and require confirmation against the source standard (source-text extraction).
• Clauses related to calibration standard oils (viscosity reference materials): the source text contains wording such as "calibration oil" and "standard oil"; the specific numbers and viscosity values require confirmation against the source standard (source-text extraction).

5. Instruments and equipment

• The source text contains a section such as "Instruments and equipment"; recognizable content involves the cold cranking simulator (CCS), rotor, temperature control, etc. The specific specification parameters require confirmation against the source standard (source-text extraction).
• The source text contains wording such as "viscometer", "constant-temperature bath", and "thermometer"; the specific models and accuracy requirements require confirmation against the source standard (source-text extraction).

6. Recommended operating conditions

• The source text contains statements related to test temperature; suspected temperature values such as "-35 ℃", "-30 ℃", "-25 ℃", and "-20 ℃" are visible, but their correspondence and applicable oil categories require confirmation against the source standard (source-text extraction).
• Conditions such as rotational speed and shear rate: no explicit values are provided in the available source.

7. Sampling and specimen preparation

• The source text contains section headings such as "Sampling" and "Specimen preparation"; the specific steps are covered by garbling and require confirmation against the source standard (source-text extraction).

8. Analytical procedure

• The "Test procedure" section exists in the source text, and recognizable content involves steps such as sample loading, constant temperature, starting the rotor, and reading the viscosity value; however, the specific step text and clause numbers require confirmation against the source standard (source-text extraction).
• Calibration procedure: the source text contains clauses related to calibration; the specific calibration oil selection and criteria require confirmation against the source standard (source-text extraction).

9. Qualitative and quantitative determination and calculation formulas

• The source text contains sections such as "Expression of results" and "Calculation"; the specific calculation formulas and units (mPa·s) require confirmation against the source standard (source-text extraction).
• The wording "apparent viscosity" is visible in the source text; the reported unit is suspected to be mPa·s, requiring confirmation against the source standard (source-text extraction).

10. Precision

• The "Precision" section appears in the source text, and the terms "repeatability" and "reproducibility" are visible; the specific values (such as %) require confirmation against the source standard (source-text extraction).

11. Report

• The source text contains a section such as "Report"; the specific report content requirements require confirmation against the source standard (source-text extraction).

12. Normative references

• The source text contains the section heading "Normative references"; the specific referenced standard numbers are covered by garbling and require confirmation against the source standard (source-text extraction).

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 reference