NB/SH/T 0414-2023 Standard Test Method for Odor of Petroleum Wax

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Card type: Test method

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

• Standard number: NB/SH/T 0414—2023
• Chinese full title: Standard Test Method for Odor of Petroleum Wax
• English name: Standard test method for odor of petroleum wax
• Replacement relationship: replaces SH/T 0414—2004 "Standard Test Method for Odor of Petroleum Wax"
• Previous versions: first issued in 1980 as SH/T 0414—1980, first revision in 1992, second revision in 2004, this is the third revision
• Publication/implementation: published on 2023-12-28, implemented on 2024-06-28
• Custodian: Subcommittee on Petroleum Wax Products of the National Technical Committee for Standardization of Petroleum Products and Lubricants (SAC/TC 280/SC3)
• Drafting organization: Dalian Research Institute of Petroleum and Petrochemicals, China Petroleum & Chemical Corporation

2. Scope of application and non-applicability

• This document describes a test method for evaluating the odor intensity of petroleum wax.
• This document is applicable to the determination of odor of block and pellet petroleum wax obtained by different forming processes.
• Not applicable: not provided in the available source.

3. Method principle

One method is to scrape about 10 g thin slices from the wax block as the test specimen, place them on odorless glassine paper, and have each member of the test panel evaluate the odor of the specimen and assign the numerical rating that best corresponds to the odor intensity. Another method is to place the wax thin slices into a specimen bottle, and each member of the test panel makes an odor evaluation within 15 min～60 min after the specimen is prepared. The average of the numerical odor ratings given by the test panel members is taken as the odor evaluation value of the sample.

4. Reagents and materials (purity / preparation)

• Paper: odorless glassine paper (5.2).
• Specimen bottle: 250 mL wide-mouth glass bottle with cap (5.3).
• Other reagents: not provided in the available source.

5. Apparatus and equipment

• 5.1 Scraper: a knife or sharp tool with a smooth surface. Mechanical equipment capable of preparing thin slices from the wax block may also be used.
• 5.2 Paper: odorless glassine paper.
• 5.3 Specimen bottle: 250 mL wide-mouth glass bottle with cap.
• 5.4 Sample pressing mold: includes pressure transmission parts, forming parts, and demolding parts, used for forming pellet samples, used in conjunction with a sample press, capable of preparing wax blocks with a diameter of 7 cm～12 cm and a thickness of about 4 cm.
• 5.5 Sample press: can provide a pressure of 5 MPa～12 MPa for the sample pressing mold (precision 0.5 MPa), can control the sample pressing time (precision 1 s) or be equipped with a stopwatch, and the working space of the sample press meets the requirements of the sample pressing mold.
• 5.6 Balance: precision 0.1 g.

6. Recommended operating conditions

• The odor test should be conducted in an odorless room as much as possible, and if possible, low relative humidity should also be avoided to prevent dulling of the sense of smell (9.1 Note).
• Pellet sample pressing and forming pressure: within the range of 5 MPa～12 MPa, press for 10 s to form (8.2).
• Note: For common fully refined paraffin wax, semi-refined paraffin wax, and food additive paraffin wax, a pressure of 7 MPa may be selected. For some relatively sticky samples, it is advisable to add odorless glassine paper of the corresponding size on the upper and lower pressing surfaces to reduce adhesion between the sample and the forming parts and pressure transmission parts (8.2 Note).
• Specimen bottle method evaluation time window: within 15 min～60 min after the specimen is prepared (9.3).
• Each person shall not evaluate more than three specimens at the same time, and the interval between each group of tests shall be no less than 15 min (9.5).

7. Sampling and specimen preparation

• Sampling: unless otherwise specified, sampling shall be carried out in accordance with GB/T 4756 or SH/T 0229 (Chapter 7).
• 8.1 Block samples are wax blocks at room temperature, and the wax block shall be capable of preparing at least 100 g wax thin slices.
• 8.2 Pellet samples are wax pellets at room temperature. Take at least 120 g of sample and place it into the forming part of the sample pressing mold (5.4), place it on the worktable of the sample press (5.5) and press to form, set the sample pressing and forming pressure within the range of 5 MPa～12 MPa, press for 10 s to form, then use the demolding part to demold and prepare a wax block.
• 8.3 The amount of specimen for evaluation by each member of the test panel is about 10 g.

8. Analytical procedure

• 9.1 Use a clean scraper to scrape off the surface of the wax block sample to expose a fresh surface, then prepare thin slice specimens and place them on odorless glassine paper (5.2), preparing one specimen for each member of the test panel. Thin slices of block samples shall be obtained from the fractured cross-section of the sample.
• 9.2 After the specimen is prepared, each member of the test panel shall immediately bring the nostril close to the specimen and gently smell it to make an odor evaluation.
• 9.3 In another method, after the specimen is prepared, immediately transfer it into a clean, odorless specimen bottle (5.3), then cover the bottle cap, preparing one specimen for each member of the test panel. Within 15 min～60 min after the specimen is prepared, each member of the test panel shall remove the bottle cap and gently smell at the mouth of the specimen bottle to make an odor evaluation.
• 9.4 Each member of the test panel shall record the corresponding numerical rating according to Table 1 based on the odor intensity he or she smells. Before all tests are completed, the test panel members shall not discuss the test results.
• 9.5 Each person shall not evaluate more than three specimens at the same time, and the interval between each group of tests shall be no less than 15 min.
• Test panel: composed of at least 5 people (6.1); members shall be selected in accordance with Annex A, and members with reduced olfactory sensitivity and any member suffering from respiratory diseases shall be excluded (6.2).

Table 1 Odor intensity rating

9. Qualitative and quantitative determination and calculation formula

• Calculate the average of the numerical odor ratings of the sample given by the test panel members, rounded to 0.5 unit(s). If the rating of any individual member differs from the average by more than 1.0 unit(s), all test panel members shall re-conduct the odor evaluation test on the sample. If in the second test there is still an individual result exceeding the average by 1.0 unit(s), this result may be discarded and a new average calculated (Chapter 10).
• Annex A scoring formula for selecting test panel members: Score = [(R − L)/R] × 100 Where: R— the number of points completely opposite to the panel ranking order; L— the actual number of points compared with the panel ranking order.
• Annex A scoring rules: in each test, if the sample appears in the 1 position, then 4 point(s) are given; if the sample appears in the 2 position, then 3 point(s) are given; if the sample appears in the 3 position, then 2 point(s) are given; if the sample appears in the 4 position, then 1 point(s) are given (A.2.1). The consistency of correct evaluation and individual repeatability of test panel members should both be above 70 points (A.4).

10. Precision

• Since the odor rating is determined only according to the test method and there is no available reference material for evaluating odor, no bias is given (Chapter 12).
• Specific precision values: not provided in the available source.

11. Report

The average value evaluated by the test panel, rounded to the nearest 0.5 unit(s), is taken as the odor rating of the sample (Chapter 11).

12. Referenced documents

• GB/T 4756 Petroleum liquids — Manual sampling
• SH/T 0229 Sampling method for solid and semi-solid petroleum products
• GB/T 1.1—2020 "Guidelines for standardization work — Part 1: Structure and drafting rules for standardization documents" (foreword, drafting basis)

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