GB/T 18851.2-2008 English PDF (GBT18851.2-2008)

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GB/T 18851.2-2008: Non-destructive testing -- Penetrant testing -- Part 2: Testing of penetrant materials
GB/T 18851.2-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.100
J 04
GB/T 18851.2-2008 / ISO 3452-2:2006
Replacing GB/T 18851.2-2005
Non-destructive testing - Penetrant testing –
Part 2: Testing of penetrant materials
(ISO 3452-2:2006, IDT)
ISSUED ON: SEPTEMBER, 26, 2008
IMPLEMENTED ON: MAY 1, 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 ... 6 
5  Testing of penetrant materials ... 7 
6  Test methods and requirements ... 10 
7  Packaging and labelling ... 26 
Annex A (Normative) Comparison of fluorescent brightness ... 28 
Annex B (Normative) Process control tests ... 30 
Annex C (Informative) Equipment for determination of the visibility of
fluorescent indications ... 41 
Bibliography ... 42 
Foreword
GB/T 18851 "Non-destructive testing penetrant testing" is divided into five parts:
— Part 1: General principles;
— Part 2: Testing of penetrant materials;
— Part 3: Reference test blocks;
— Part 4: Equipment;
— Part 5: Means of verification.
This Part is Part 2 of GB/T 18851.
This Part equivalently adopts ISO 3452-2:2006 "Non-destructive testing - Penetrant
testing - Part 2: Testing of penetrant materials" (English version).
This Part equivalently translates ISO 3452-2:2006.
For convenience of use, this Part makes the following editorial amendments:
— Use decimal point "." to replace the comma ", " that is used as decimal point;
— Foreword in the international standard is deleted;
— Use the introduction specified in GB/T 1.1-2000 to replace the introduction in the
international standard.
This Part replaces GB/T 18851.2-2005 "GB/T 18851 "Non-destructive testing penetrant
testing part 2: Testing of penetrant materials"
Compared with GB/T 18851.2-2005, this Part has the following changes:
— Safety warning is adjusted (Chapter 4 in 2005 edition; The front paragraph in the
main text in this edition);
— Term "candidate" is added (see sub-clause 3.2);
— Classification is amended (Chapter 5 in 2005 edition; chapter 4 in this edition);
— Testing classification is amended (sub-clause 6.1 in 2005 edition; sub-clause 5.1
in this edition);
Non-destructive testing - Penetrant testing –
Part 2: Testing of penetrant materials
SAFETY PRECAUTIONS — The materials required by this Part of GB/T 18851
include chemicals which may be harmful, flammable and/or volatile. All
necessary precautions shall be observed. All relevant national and local
regulations pertaining to health and safety, environmental requirements, etc.
shall be observed.
1 Scope
This Part of GB/T 18851 specifies the technical requirements and test procedures for
penetrant materials for their type testing and batch testing. It also details on-site control
tests and methods.
2 Normative references
The articles contained in the following documents have become part of this Part of GB/T
18851 when they are quoted herein. For the dated documents so quoted, all the
modifications (excluding corrections) or revisions made thereafter shall not be applicable
to this Part. For the undated documents so quoted, the latest editions shall be applicable
to this Part.
GB/T 5097 Non-destructive testing - Penetrant testing and magnetic particle testing -
Viewing conditions (GB/T 5097-2005, ISO 3059:2001, IDT)
GB/T 12604.3 Non-destructive testing – Terminology - Terms used in penetrant
testing (GB/T 12604.3-2005, ISO 12706:2000, IDT)
GB/T 18851.1 Non-destructive testing--Penetrant testing--Part1: General principles
(GB/T 18851.1-2005, ISO 3452:1984, IDT)
GB/T 18851.3 Non-destructive testing - Penetrant testing - Part 3: Reference test
blocks (GB/T 18851.3-2008, IDT ISO 3452-3:1998)
GB/T 27025 General requirements for the competence of testing and calibration
laboratories (GB/T 27025-2008, ISO/IEC 17025:2005, IDT)
3 Terms and definitions
B.4.2.1 Reference test parts cleaning
To ensure that reference test parts are sensitive enough to a change in penetrant
process parameters, it is necessary to draw out all of the penetrant, which remains
entrapped in the discontinuities after testing. It is of the utmost importance not to
physically modify the discontinuities.
The best way is to counteract the adsorption effect on the entrapped penetrant due to the
discontinuity walls by a stronger capillary effect. A solvent-based (non-aqueous wet)
developer is the most appropriate means.
The following procedure shall be used.
a) Immediately after processing, remove developer with a water rinse.
b) Dry, i.e. Not by wiping.
c) Apply a thick coat of form d developer, with the coating arriving wet on the surface.
d) Leave for 10 min to 15 min.
e) Repeat stages a) to d), allowing the developer to remain for 30 min.
f) Check for penetrant traces under adequate illumination and, if present, repeat
stages a) to d) until all traces of penetrant have been removed.
g) Finally, wash with water and dry.
B.4.3 Penetrant appearance
Check for any abnormal aspects of the penetrant (e.g. milky appearance, visible
contamination, deposits of water at the bottom or top of the penetrant).
B.4.4 Rinse water appearance
When using recycled water, check for opacity, fluorescence, foam and coloration of the
rinse water. Any of the suggests indicates that the treatment system is not functioning
effectively.
B.4.5 Rinse water temperature
Check that the rinse water temperature is within the specified limits.
B.4.6 Oven temperature