GB/T 5483-2008 English PDF (GBT5483-2008)

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GB/T 5483-2008: Natural gypsum
GB/T 5483-2008
GB
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 91.100.10
Q 62
Replacing GB/T 5483-1996
Natural gypsum
天然石膏
ISSUED ON. JUNE 30, 2008
IMPLEMENTED ON. APRIL 01, 2009
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Classification and level ... 6 
5 Requirements ... 7 
6 Test methods ... 7 
7 Testing rules ... 8 
8 Marking, packaging, transport and storage ... 9 
Foreword
This standard replaces GB/T 5483-1996 “Gypsum and anhydrite”.
As compared with GB/T 5483-1996, the main changes of this standard are as
follows.
- CHANGE the standard name;
- MODIFY the “Subject content and scope of use” into “Scope” and MODIFY
the contents (Chapter 1 of 1996 version; Chapter 1 of this version);
- MODIFY the “Normative references”; ADD the introductory information;
ADD the year to the reference standards (Chapter 2 of 1996 version;
Chapter 2 of this version);
- ADD Chapter 3 “Terms and definitions” (SEE Chapter 3);
- MODIFY the “Product classification” into “classification and level” (Chapter
4 of 1996 version; Chapter 4 of this version);
- MODIFY the “block size” into “specifications” (Clause 4.2 of 1996 version;
Clause 4.2 of this version);
- DELETE the “product name” from Table 1, and DELETE the molecular
formula (Table 1 of 1996 version; Table 1 of this version);
- ADD the “Determination of free water” (Clause 6.1 of this version);
- ADJUST the clause on the “Determination of grade” (Chapter 6 of 1996
version; Clause 6.2 of this version);
- USE the letter to replace substitute the molecular formula in the grade
calculation (Chapter 6 of 1996 version; Clause 6.2.3 of this version);
- MODIFY the “Acceptance rules” into “Testing rules” (Chapter 7 of 1996
version; Chapter 7 of this version);
- MODIFY the “Batch and number” into the “Batching rules” (Clause 7.1 of
1996 version; Clause 7.1 of this version);
- DELETE the “delivery and acceptance” from the original standard (Clause
7.2 of 1996 version);
- MODIFY the “Sampling method” into “Sampling method and same
preparation” (Clause 7.3 of 1996 version; Clause 7.2 of this version);
- MODIFY the “Testing items and product testing form” into “Testing”
(Clause 7.4 of 1996 version; Clause 7.3 of this version);
- MODIFY the clauses and contents of the “Determination rules” from the
original standard (Clause 7.5 of 1996 version; Clause 7.4 of this version);
- MODIFY the “Transport and storage” into “Marking, packaging, transport,
and storage” (Chapter 8 of 1996 version; Chapter 8 of this version);
This standard was proposed by the China Building Materials Federation.
This standard shall be under the jurisdiction of the National Non-metallic
Mineral Products and Products Standardization Technical Committee.
The drafting organizations of this standard. Xianyang Institute of Non-metallic
Minerals Research and Design Institute, China Building Materials Science
Research Institute, Henan Institute of Building Materials Detection Co., Ltd.
The main drafters of this standard. Jiao Hongbin, Zhang Xiufen, Wang Xianbin,
Liu Yongchuan, Feng Deping.
This standard was first released in October 1985, first revised in 1996, AND
this is the second revision.
Natural gypsum
1 Scope
This standard specifies the terms and definitions, classification and level,
requirements, test methods, inspection rules, markings, packaging, transport
and storage of natural gypsum products.
This standard applies to natural gypsum mineral products output in nature.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Standard;
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 2007.2-1987 General rules for the sampling and sample preparation
of minerals in bulk - Manual method of sample preparation
GB/T 5484 Methods for chemical analysis of gypsum
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Grade
It refers to the content of the useful components or useful minerals per unit
volume or unit mass of ore.
3.2
Free water (H2O-)
It refers to the moisture absorbed by the material from air.
3.3
Combined water (H2O+)
It refers to, in crystalline material, the certain amount of water molecules
which are formed through combination with ions or molecules through the
chemical bonding force.
3.4
Gypsum
It refers to the material which is mainly existed in the form of calcium sulfate
dihydrate (CaSO4 • 2H2O).
3.5
Anhydrite
It refers to the material which is mainly existed in the form of anhydrous
calcium sulphate (CaSO4), wherein the ratio of the mass fraction of
anhydrous calcium sulphate (CaSO4) to the sum of the mass fraction of
calcium sulphate dihydrate (CaSO4 • 2H2O) and anhydrous calcium
sulphate (CaSO4) is not less than 80%.
3.6
Mixed gypsum
It refers to the material which is mainly existed in the form of calcium sulfate
dihydrate (CaSO4 • 2H2O) and anhydrous calcium sulfate (CaSO4), wherein
the ratio of the mass fraction of the anhydrous calcium sulfate (CaSO4) to
the sum of the mass fraction of the calcium sulfate dihydrate (CaSO4 • 2H2O)
and anhydrous calcium sulfate (CaSO4) is less than 80%.
4 Classification and level
4.1 Classification
Natural gypsum products can be divided into three categories based on the
mineral composition. gypsum (code G), anhydrite (code A), and mixed gypsum
(code M).
4.2 Level
Each type of natural gypsum is divided into five levels based on the grade.
special level, level 1, level 2, level 3, and level 4.
4.3 Specifications
Product block size is not greater than 400 mm. If there are special
requirements, they shall be as negotiated between the supplier and the
purchaser.
5 Requirements
5.1 Natural gypsum products free water content (mass fraction) is not more
than 4%.
5.2 The grade of each natural gypsum product shall meet the requirements of
Table 1.
Table 1
Level Grade (mass fraction) / % Gypsum (G) Anhydrite (A) Mixed gypsum (M)
Special level ≥ 95 - ≥ 95
Level 1 ≥ 85
Level 2 ≥ 75
Level 3 ≥ 65
Level 4 ≥ 55
6 Test methods
6.1 Determination of free water
Determination of free water is in accordance with GB/T 5484.
6.2 Grade determination
6.2.1 Determination of combined water is in accordance with GB/T 5484.
6.2.2 Determination of sulfur trioxide is in accordance with GB/T 5484.
6.2.3 Grade calculation.
Where.
G1 - Grade of category G products, %;
G2 - Grade of category A and M products, %;
X1 - Mass fraction of CaSO4, %;
W - Mass fraction of combined water, %;
S - Mass fraction of sulfur trioxide, %.
7 Testing rules
7.1 Batching principles
Acceptance and supply of natural gypsum products are made by batch. The
300 t of natural gypsum of same category and same level which is supplied