GB/T 35877-2018 (English Version)

Standard No.: GB/T 35877-2018
Language: Chinese, Available in English version
Release Date: 2018
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 35877-2018

Scope: This standard specifies the terms and definitions, principles, instruments and utensils, sample preparation, operating procedures and result expression of freezing tests for animal and vegetable fats and oils. This standard is applicable to animal and vegetable fats and oils.

Introduction

Standard Overview

National Standard of the People's Republic of China GB/T 35877-2018 "Freezing Test for Animal and Vegetable Oils and Fats for Grain and Oil Inspection" is a test method standard for the changes in the physical properties of animal and vegetable oils and fats under low temperature conditions. This standard mainly specifies the terms and definitions, principles, instruments and utensils, sample preparation, operating procedures and result expression of freezing tests for animal and vegetable oils and fats, and is applicable to the quality inspection of various animal and vegetable oils and fats.

Technical Specifications and Instruments and Equipment

Serial number	Instrument name	Specifications	Instructions for use
1	Oil sample bottle	Volume approximately $115~\mathrm{mL}$ (diameter approximately $40\mathrm{mm}$)	Used to store and test oil and grease samples, requires to be clean, dry, dust-free and have a sealed lid.
2	Water bath	Temperature $25~^{\circ}\mathrm{C}\pm1~^{\circ}\mathrm{C}$ and $50~\mathrm{C}\pm2~^{\circ}\mathrm{C}$	Used for heating and cooling of oil samples to ensure accurate test temperature control.
3	$0~^{\circ}\mathrm{C}$ Ice water bath	Can hold $2~\mathrm{kg}\sim5~\mathrm{kg}$ crushed ice water	Used to simulate low temperature environment and test the physical changes of oils and fats under freezing conditions.

Detailed Operation Procedures

According to the standard requirements, the freezing test of animal and vegetable oils and fats includes the following key steps:

Sample preparation: Heat the mixed oil sample ($200\mathrm{mL}\sim300\mathrm{mL}$) to $130~^{\circ}\mathrm{C}$, and filter it with filter paper while it is hot to remove trace moisture and possible crystal nuclei.
Sample loading and sealing: Fill the oil sample bottle with the filtered oil sample, seal it with a cork, and place it in a water bath at $25~^{\circ}\mathrm{C}$ to cool to room temperature.
Freezing treatment: Immerse the cooled oil sample bottle in an ice water bath at $0~^\circ\mathrm{C}$ for $5.5\mathrm{h}$, and add crushed ice in time to maintain a constant low temperature.
Result observation: After taking out the sample, observe whether there is fat crystallization or floccules under a backlit black background, and record the test results.

Standard formulation background and technological evolution

GB/T 35877—2018 is based on the relevant methods of the International Organization for Standardization (ISO) and the American Oil Chemists Society (AOCS), combined with China's national conditions and technical needs. The release of this standard fills the gap in the field of freezing tests for animal and vegetable oils in China, and provides a scientific basis for grain and oil quality testing.

Implementation Suggestions

In order to ensure the effective implementation of the standard, it is recommended that enterprises strengthen management in the following aspects:

Equip with instruments and equipment that meet the requirements and calibrate them regularly to ensure accuracy.
Establish a professional testing team, and the personnel must receive systematic training and be familiar with the test operation specifications.
Optimize the sample processing process to ensure the representativeness of the samples and the reliability of the test results.

GB/T 35877-2018 Referenced Document

GB/T 15687 Animal and vegetable fats and oils-Preparation of test sample

GB/T 35877-2018 history

2018 GB/T 35877-2018 Inspection of grain and oils—Cold test of animal and vegetable fats and oils