Standard No.:	GJB 150.9A-2009
English Name:	Laboratory environmental test methods for military materiel - Part 9: Fungus test
Chinese Name:	军用装备实验室环境试验方法 第9部分:湿热试验
Professional Classification:	GJB    Professional Standard - Military
Issued on:	2009-05-25
Implemented on:	2009-8-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	4500 words
Price(USD):	135.0
Delivery:	via email in 1 business day

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. GJB 150 consists of the following 28 parts under the general title Laboratory environmental test methods for military material: a) Part 1: General requirements; b) Part 2: Low pressure (altitude) test; c) Part 3: High temperature test; d) Part 4: Low temperature test; e) Part 5: Temperature shock test; f) Part 7: Solar radiation test; g) Part 8: Rain test; h) Part 9: Damp heat test; i) Part 10: Fungus test; j) Part 11: Salt fog test; k) Part 12: Sand and dust test; l) Part 13: Explosive atmosphere test; m) Part 14: Immersion test; n) Part 15: Acceleration test; o) Part 16: Vibration test; p) Part 17: Acoustic noise test; q) Part 18: Shock test; r) Part 20: Gunfire vibration test; s) Part 21: Wind pressure test; t) Part 22: Icing/freezing rain test; u) Part 23: Motions and inclinations test; v) Part 24: Temperature-humidity-vibration-altitude test; w) Part 25: Vibro-acoustic/temperature test; x) Part 26: Contamination by fluids test; y) Part 27: Pyroshock test; z) Part 28: Acidic atmosphere test; aa) Part 29: Ballistic shock test; bb) Part 30: Ship shock test. This is Part 9 of GJB 150, which replaces GJB 150.9-1986 Environmental test methods for military equipments - Damp heat test. The following main changes have been made in this part with respect to GJB 150.9-1986: a) the Clause “Test conditions" in GJB 150.9-1986 is deleted, and the tailoring guidelines for determining test methods, test sequences and test conditions are added; b) the requirements for test information are added; c) the type and the number of test cycles are changed; d) the timing and time requirements for intermediate detection are clearly specified; e) Annex A is added. Annex A of this part is informative. This part was proposed by the Electronic Information Base Department of the General Armaments Department of the PLA. The previous edition of this part is as follows: GJB 150.9-1986. Laboratory environmental test methods for military materiel - Part 9: Damp heat test 1 Scope This part specifies the purpose and application, tailoring guidelines, information requirements, test requirements, test process and result analysis of damp heat test carried out in military materiel laboratory. This part is applicable to damp heat test of military materiel. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part. For dated reference, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this part. However parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references or references with version not indicated, the latest edition of the normative document referred to applies. GJB 150.1A-2009 Laboratory environmental test methods for military materiel - Part 1: General requirements GJB 4239 General requirements for materiel environmental engineering 3 Purpose and application 3.1 Purpose The purpose of this test is to determine the materiel’s resistance to the damp and heat atmospheric effects. 3.2 Application This test is applicable to: a) materiel that may be stored or used in damp-heat environment; b) materiel that may be stored or used in high humidity environment; c) potential problems that show the materiel may be related to damp heat. It is better to test materiel in proper natural environment, but it is difficult to achieve it due to such reasons as logistical support, cost or time. Damp-heat conditions may occur all year round in tropical areas, seasonally in mid-latitude areas, and also occur in materiel undergoing comprehensive changes in pressure, temperature and relative humidity. There are other high humidity environments around the world. 3.3 Restriction This test can reproduce neither all humidity effects related to natural environment, such as long-term effects, nor humidity effects related to low humidity environment. This test provides a general stress environment to expose the possible problems of equipment rather than reproducing the complex humidity environment, so natural or induced temperature and humidity cycles are not included in this test. In this test, the internal components of the airtight seal assembly shall not be evaluated, and the following conditions shall not be considered: a) condensation in airborne and ground materiel caused by pressure and temperature changes; b) condensation caused by blackbody radiation (such as night sky effect); c) combined effects of biological and chemical pollutants with moisture or condensation; d) liquid water accumulated in materiel or packaging and retained for a long time. 4 Tailoring guidelines 4.1 Selection of test methods 4.1.1 General Analyze the requirements of relevant technical documents, apply the results obtained by implementing GJB 4239 in the ordering process of materiel (products), determine the stage of damp-heat environment in the service life of materiel, and determine whether this test is necessary according to the following environmental effects. When it is necessary to carry out this test through determination and the same test piece is used for this test and other environmental tests, the sequence of this test and other tests shall also be determined. 4.1.2 Environmental effects Humidity will have physical and chemical effects on materiel: changes in temperature and humidity may lead to condensation in materiel. See Annex A for the physical phenomena related to humidity. Taking the following typical problems into consideration is helpful to determine whether this test is applicable to the materiel under test: a) surface effects, such as: 1) metal oxidation/electrochemical corrosion: 2) accelerate the chemical reaction; 3) chemical or electrochemical damage of organic and inorganic surface coatings; 4) corrosion layer produced by interaction between surface moisture and external attachments; 5) adhesion or bonding caused by the change of friction coefficient. b) changes in material properties, such as: 1) material expansion due to absorption effect; 2) other property changes, such as physical strength reduction, electrical insulation and thermal insulation characteristics change, composite material delamination, plasticity or elasticity change, hygroscopic material performance decrease, explosive and propellant moisture absorption and performance decrease, optical element image transmission quality decrease, lubricant performance decrease. c) the effects of condensation and free water, such as: 1) electrical short circuit; 2) optical surface blur; 3) change of thermal conductivity. 4.1.3 Selection of test sequence 4.1.3.1 General requirements See GJB 150.1A-2009, 3.6. 4.1.3.2 Special requirements If the damp heat test has effects on other subsequent tests of the same test piece, the damp heat test shall be arranged after this test. Similarly, because the potential comprehensive environmental impact is not representative, it is generally inappropriate to carry out this test on the same test piece that has undergone salt spray test, sand and dust test or mold test.

Foreword i 1 Scope 2 Normative references 3 Purpose and application 4 Calculation guidelines 5 Information requirements 6 Test requirements 7 Test process 8 Result analysis Annex A (Informative) Physical phenomena related to humidity