This standard replaces GB/T 5495-1985 "Test Method for Roughness Ratio of Rice in Grain and Oilseed Inspection". This standard specifies the terms and definitions, principles, instruments and utensils, sampling, sample preparation, operating procedures and result calculation of the roughness ratio of rice. This standard is applicable to the determination of the roughness ratio of commercial rice. The main differences between this standard and GB/T 5495-1985 are as follows: - The name of the standard is changed to "Test Method for Roughness Ratio of Rice in Grain and Oilseed Inspection"; - Normative reference documents, terms and definitions, and principles are added; - Definitions are given for clean rice and roughness ratio; - The sample size of clean rice is changed from 20g to 20g~25g. GB/T 5495-2008 Grain and Oil Inspection Rice Roughness Test GB/T5495-2008 Standard Download Decompression Password: www.bzxz.net
This standard replaces GB/T 5495-1985 "Grain and Oil Inspection Rice Roughness Test Method". This standard specifies the terminology and definition, principle, instruments and utensils, sampling, sample preparation, operation steps and result calculation of rice roughness. This standard is applicable to the determination of commercial rice roughness. The main differences between this standard and GB/T 5495-1985 are as follows: ———The name of the standard is changed to "Grain and Oil Inspection - Rice Roughness Ratio Test"; ———Normative reference documents, terms and definitions, and principles are added; ———Defines are given for clean rice and roughness ratio; ———The clean rice sample size is changed from 20g to 20g~25g.

The clauses in the following documents become clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard.
GB1350 Rice
GB5491 Sampling and sub-sampling methods for grain and oilseed inspection
GB/T5494 Grain and oil inspection Inspection of impurities and imperfect grains in grain and oilseed

ICS 67.060
National Standard of the People's Republic of China
GB/T5495—2008
Replaces GB/T 5495-1985
Inspection of grain and oils—Determination of huskcd rice yield from paddy
Inspection of grain and oils—Determination of huskcd rice yield from paddyIssued on 2008-11-04
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Administrative Committee of Standardization of the People's Republic of China
Implementation on 2009-01-20
This standard replaces GB/T5495-1985 "Inspection of grain and oilseeds—Determination of huskcd rice yield from paddy".
The main differences between this standard and CB/T5495--1985 are as follows: the name of the standard is changed to "Grain and Oil Inspection and Roughness Test"; ... normative reference documents, terms and definitions, principles are added; the roughness of clean rice is defined; the sample size of clean rice is changed from 20g to 20g~~25g. This standard is proposed by the State Administration of Grain.
This standard is under the jurisdiction of the National Technical Committee for Grain and Oil Standardization. GB/T5495-2008
The drafting units of this standard are: Hubei Grain and Oil Food Quality Monitoring Station, Liaoning National Grain Quality Monitoring Center, Jilin Grain Bureau, Jiangsu Grain Bureau Grain and Oil Quality Monitoring Institute, Sichuan Grain and Oil Central Monitoring Station. The main drafters of this standard are: Xiong Ning, Liu Zihao, Cui Guohua, Yu Wei, Liu Jiming, Wang Yan, Song Changquan, Chen Jianwei, Li Yi. The previous versions of the standards replaced by this standard are: -GB/T54951985.
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1 Scope
Grain and Oil Inspection
Paddy Roughness Ratio Inspection
GB/T5495---2008
This standard specifies the terms and definitions, principles, instruments and appliances, proofing, sample preparation, operating procedures and result calculation of paddy roughness ratio. This standard applies to the determination of the roughness ratio of commercial paddy. 2 Normative ReferenceswwW.bzxz.Net
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties that reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all referenced documents without an import date, the latest version shall apply to this standard. GB1350 Grain
GIB5491 Grain and oilseed inspection sampling and subsampling method GB/T5491 Grain and oilseed inspection inspection of impurities and imperfect grains in grains and oilseeds 3 Terms and definitions
The terms and definitions established in GB1350 and the following terms and definitions shall apply to this standard. 3. t
Clean paddy
Rice after impurities and brown rice outside the grain are removed. 3.2
Roughness yield
The mass fraction of brown rice (of which the mass of imperfect grains is calculated as half) after the husked rice sample is husked in the sample. 4 Principle
The rice is husked by combining the experimental husking machine and manual husking, and the imperfect grains of brown rice are inspected by sensory inspection method. The husked rice sample, brown rice and imperfect grains are weighed separately to calculate the roughness. 5 Instruments and appliances
5.1 Balance: graduation value 0.01g,
5.2 Sample divider or sample divider plate.
5.3 Grain screening: round hole sieve with diameter 2.0 mm. 5.4 Experimental rice sieve.
6 Sampling
Perform according to GB 5491.
7 Sample preparation
7.1 Laboratory samples shall not be less than 1.0kg.
7.2 Sample the laboratory samples according to the method of GB5191 to obtain the test samples. 7.3 Remove impurities and brown rice from the test samples according to the method of GB/T5494 to obtain the clean rice test samples. 1
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GB/T5495—2008
8 Operation steps
Weigh 20g~25g sample (m) from the clean rice sample, accurate to 0.01g, first remove the sprouted grains, peel the shells separately, and weigh the mass of the sprouted brown rice (nl). Then the remaining sample is husked with an experimental husk machine to remove the husk, and the mass of the brown rice after husking by the husk machine is weighed (m), and the imperfect brown rice in the husk brown rice is sensory tested, and the mass of the imperfect brown rice (m:) is weighed. 9 Result calculation
The roughness rate of the husk brown rice is calculated according to formula (1):
Wherein:
Roughness rate of the husk brown rice, %;
X = (m2+mz)(m2+m2)/2
The mass of the sprouted brown rice, in grams (g); m2-the mass of the brown rice after husking by the husk machine, in grams (g); t
The mass of the imperfect brown rice, in grams (g); The mass of the sample, in grams (g)
Under repeatability conditions, if the absolute difference of the two independent test results is not less than 0.5%, the average is the test result: the test result is rounded to one decimal place.
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GB/T5495-2008
People's Republic of China
National Standard
Grain and Oil Inspection Inspection of Roughness
GB/T 5495—2008
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