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22、WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TIA-455-56-C iFOTP-56 Test method for evaluating fungus resistance of optical fiber and cable Contents Foreword 1 Introduction iii 1.1 Intent 1 1.2 General effects 1 1.3 Hazards 1 2 Applicable documents 1 3 Apparatus 2 3.1 Chamber 2 3.2 Specime
23、n container 2 4 Sampling and specimens 2 4.1 General requirements 2 4.2 Fiber samples 3 4.3 Cable samples 3 5 Procedure 3 5.1 General procedure 3 5.2 Test fungi 4 5.3 Inspection 4 6 Calculations or interpretation of results 5 7 Documentation 5 8 Specification information 5 Annex A (informative) 6 A-
24、1 Introduction 6 A-2 Documents in print 6 A-3 Documents in progress 6 A-4 Comparisons 6 TIA-455-56-C iiThis page left blankTIA-455-56-C iiiFOTP-56 Test method for evaluating fungus resistance of optical fiber and cable Forward (This Foreword is informative and not part of the Standard.) This Standar
25、d is from Standards Proposal No. SP-3-3272-RV3, formulated under the cognizance of the TIA FO-4.2 Subcommittee on Optical Fibers and Cables. This FOTP is part of the series of test procedures included within Recommended Standard TIA/EIA-455. Revision C of this document adds method 508 of MIL-STD-810
26、 within this test method as a preferred procedure for U.S. military applications when specified. A general comparison of ASTM G21 and method 508 of MIL-STD-810 shows that the ASTM G21 procedure places test specimens in a dish or pan during the fungi spore incubation period while method 508 of MIL-ST
27、D-810 suspends test specimens during the incubation period. The preferred U.S military method utilizes microscopic inspection of the specimens to determine amount of microbial growth, whereas ASTM G21 uses a general visual inspection. There is one informative Annex. Key words: spore, culture, fungi,
28、 incubation, growth. TIA-455-56-C ivThis page left blank TIA-455-56-C 11 Introduction 1.1 Intent This method is intended to evaluate the adequacy of optical fibers and cables to retain their structural integrity and performance level under environmental conditions favorable for the development of fu
29、ngal growth. These conditions are: high humidity, a warm atmosphere, and the presence of inorganic salts. 1.2 General effects 1.2.1 Organic materials commonly form an integral part of optical fiber: for plastic cladding, for protecting the surface of a glass fiber, and for buffering. Some fibers are
30、 fabricated entirely from various plastic materials. Organic materials are also commonly used in fabricating optical cable: bufferings, filling materials, strength members, and jacketing. 1.2.2 Micro-organisms digest certain organic materials as a normal metabolic process, thus degrading them and ca
31、using porosity and loss of structural integrity, even to the point of catastrophic failure. Basic resins do not usually serve as carbon sources for growth of fungi. Rather it is generally other components such as plasticizers, stabilizers, colorants, lubricants, and cellulosics that are responsible
32、for the actual fungus attack. 1.2.3 Enzymes and organic acids produced during metabolism diffuse out of their cells and on to the plastic to cause such possible phenomena as cracking; corrosion; glass etching; hardening of cable filling compounds; increased modulus; weight changes; dimensional chang
33、es; and microbending of the fiber, with a resultant increase in attenuation. 1.3 Hazards 1.3.1 Because of safety and toxicity considerations detailed in 1.3.3, conduct testing at a site specifically equipped for the purpose. This generally means a separate, isolated facility with the ability to keep
34、 the test specimens within a confined area during the entire testing and incubation period. 1.3.2 Similarly, all testing shall be performed by personnel trained in microbiological laboratory techniques, sterile routines, and proper disposal of all waste solutions at the close of testing. 1.3.3 The r
35、eason for specifying the testing site and personnel qualifications is the potentially toxic nature of fungal spores. They have been implicated in pneumonia-like respiratory infections, ulcers of the skin, and digestive problems. 2 Applicable documents ANSI/ASTM G 21-90, Standard Practice for Determi
36、ning Resistance of Synthetic Polymeric Materials to Fungi (1990) TIA-455-56-C 2EIA/TIA-455-A, Standard Test Procedures for Fiber Optic Fibers, Cables, Transducers, Sensors, Connecting and Terminating Devices, and Other Fiber Optic Components (1991) MIL-STD-810, Environmental Engineering Consideratio
37、ns and Laboratory Tests 3 Apparatus 3.1 Chamber A chamber or cabinet is required, with the instrumentation necessary to maintain the specified conditions of temperature and humidity: up to 30C and a minimum of 85% relative humidity. Provide apparatus capable of recording temperature and humidity. 3.
38、1.1 Make provision to prevent condensation from dripping directly on any of the specimens in their containers. 3.1.2 There shall be free circulation of air around each container for the test specimens. When forced air is used, the flow rate shall not exceed 1 m/s (3.3 ft/s) over the surface of the c
39、ontainers. 3.1.3 Make provision so that any heating elements inside the chamber do not directly contact the test containers. 3.2 Specimen container Provide a glass dish or pan, capable of being sterilized, for each test specimen. The container shall be large enough so that the entire specimen shall
40、be able to lie flat inside it. Provide each container with a glass cover (flat window glass makes a convenient, inexpensive one). For military applications, the test specimens may be suspended in the chamber in lieu of being placed in a dish or pan. 4 Sampling and specimens 4.1 General requirements
41、Generally, only a visual inspection is required for test specimens after they have been exposed to fungi. In this case, 3 test specimens are required for each polymeric component or part. For tests conducted with glass dishes or pans, if the 2 sides of a specimen are different, 3 specimens are requi
42、red for each side (i. e., 3 for face up and 3 for face down). If further tests beyond visual inspection are specified, the number of additional specimens shall also be specified, along with the test(s) to be run. TIA-455-56-C 3For military applications, microscopic inspection, in addition to visual
43、inspection, shall be used to verify if change observed is fungus growth (1) when material may change under test conditions (such as gelling of water blocking materials under humid conditions), (2) when uncertainly is due to scarcity of growth or unusual characteristics (such as texture, color or pat
44、tern). List magnification used for microscopic inspections. 4.2 Fiber samples 4.2.1 All test specimens shall each be at least 5 m (16 ft) long and sampled from regular production runs of optical fiber. 4.2.2 Form the specimens into loose coils with a minimum inside diameter of 200 mm (8 inches). 4.2
45、.3 Test specimens shall have no surface treatment other than that ordinarily applied during production of the fiber. 4.3 Cable samples Test specimens for cable testing shall be specified in the Detail Specification and may be in any or all of the following forms: 4.3.1 The simplest forms may be flat
46、 squares 50 mm (2 inch) on a side; flat circles 50 mm (2 inch) in diameter; or rods or tubing a minimum of 76 mm (3 inch) long cut from the material to be tested. 4.3.2 Test specimens may be from completely fabricated parts, or sections or subassemblies cut from completely fabricated parts. 4.3.3 Sa
47、mples of film-forming materials such as coatings may be in the form of films a minimum of 50 mm (2 inch) square. These films may be prepared by casting on glass, then stripping after cure; or by impregnating filter paper or ignited glass fabric. 4.3.4 For military applications, a 12 inch length of c
48、able shall be tested, stripped back 8 inches from the end to expose all cable components. Be advised that it may not be able to determine if there is fungus growth on water blocking material. 5 Procedure 5.1 General procedure 5.1.1 For nonmilitary applications, the procedure indicated in ANSI/ASTM G
49、 21-90, clauses 6 (Reagents and materials, paying careful attention to subclause 6.4, Mixed fungus spore suspension) and 7 (Viability control), as well as subclauses 9.1-9.3 (in procedure), shall be followed. TIA-455-56-C 45.1.2 For military applications, the procedure indicated in MIL-STD-810 shall be followed. Careful attention shall be paid to decontamination (test specimen, test apparatus, solutions preparation apparatus, etc. both before and after test), materials (culture stock, chemicals and water), spore suspension preparation (spore suspension concentration), positive con
