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GA/T 985: Historical versions
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| GA/T 985-2023 | English | 119 |
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Forensic sciences - Methods for casting three-dimensional impressions by using gypsum
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| GA/T 985-2012 | English | 199 |
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Casting techniques using gypsum for three-dimensional impressions of forensic
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Basic data
| Standard ID | GA/T 985-2023 (GA/T985-2023) |
| Description (Translated English) | Forensic sciences - Methods for casting three-dimensional impressions by using gypsum |
| Sector / Industry | Public Security (Police) Industry Standard (Recommended) |
| Classification of Chinese Standard | A92 |
| Classification of International Standard | 13.310 |
| Word Count Estimation | 6,622 |
| Date of Issue | 2023-03-01 |
| Date of Implementation | 2023-12-01 |
| Issuing agency(ies) | Ministry of Public Security |
GA/T 985-2023: Forensic sciences - Methods for casting three-dimensional impressions by using gypsum
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 13.310
CCSA92
Public safety industry standards of the People's Republic of China
Replace GA/T 985-2012
Forensic science three-dimensional trace plaster molding extraction method
byusinggypsum
Published on 2023-03-01
Implemented on 2023-12-01
Released by the Ministry of Public Security of the People's Republic of China
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents"
Drafting.
This document replaces GA/T 985-2012 "Method for Extraction of Three-dimensional Traces from Plaster Molds in Forensic Science" and is consistent with GA/T 985-2012.
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
---Changed the term "three-dimensional trace plaster molding extraction method" and its definition (see 3.2, 3.2 of the.2012 version);
---Added cleaning debris (see 5.1);
---Added record trace related information (see 5.7);
---Added plaster trace model making method on tilted objects (see 6.5).
Please note that some content in this document may be subject to patents. The publisher of this document assumes no responsibility for identifying patents.
This document is proposed and submitted by the Trace Inspection Sub-Technical Committee of the National Technical Committee for Standardization of Criminal Technology (SAC/TC179/SC9).
Return to home.
This document was drafted by. Physical Evidence Identification Center of the Ministry of Public Security and People's Public Security University of China.
The main drafters of this document. Jin Yifeng, Jiang Xuemei, Cui Jia, Shi Haiqing, Hu Shuliang, Bai Yanping, Lin Min, Ye Fangjian, and Dou Xiuchao.
The previous versions of this document and the documents it replaces are as follows.
---First released as GA/T 985-2012 in.2012;
---This is the first revision.
Forensic science three-dimensional trace plaster molding extraction method
1 Scope
This document describes the extraction method for three-dimensional trace plaster casts.
This document is suitable for plaster molding extraction of three-dimensional traces at the scene of various cases (incidents).
2 Normative reference documents
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations
For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to
this document.
GB/T 23865 Proportional photography rules
GB/T 29349 On-site photography and video recording requirements
GB/T 29352 Rules for photography and video recording of physical evidence examination
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
The imprint formed on the marking object can reflect the convex and concave structure of the surface of the marking object.
3.2
A method for extracting three-dimensional traces by using gypsum powder as the main material to make plaster models.
4 Equipment and materials
4.1 Equipment
Containers, molding enclosures, molding frames, fine screens.
4.2 Materials
Modeling plaster powder, water, dust fixative, evidence label.
5 Operation steps and methods
5.1 Clean up debris
For irrelevant debris that later falls into the three-dimensional traces, and rainwater that falls or penetrates, use appropriate methods without damaging the characteristics of the traces.
Method. Carefully remove the debris and absorb all the water.
...
