NEEDED - A STANDARD TEST FOR EVALUATING THE FUNGUS RESISTANCE OF WIRE AND CABLE,
Abstract
A relatively simple test method, specifically for evaluating the fungus resistance of all types of wire and cable is proposed. This method is given in detail in the appendix. Briefly the test is performed as follows: (1) Prepare six short wire samples with wound wire electrodes, spaced 1 inch apart, and one inch from each end of the sample. (2) Prepare a mixed fungi spore suspension from four fungi - Aspergillus niger, Penicillium citrinum, Trichoderma T-1, and Chaetomium globosum. (3) Place three of the wire samples in a humidity cabinet, or in a desiccator (over a saturated solution of ammonium dihydrogen phosphate) and inoculate them by spraying with the mixed fungi spore suspension. (4) Place a drop of the spore suspension on a slant of 'Mycophil' agar, as a viability control. (5) Place the remaining three samples in a similar container, but do not inoculate them. These are the control samples. (6) Incubate both sets of samples at 29 plus or minus 1C and 92% plus or minus 2% relative humidity for 28 days. (7) Examine the inoculated wire samples for fungus growth and rate them from 0 to 3, depending on the growth present. (8) Measure the surface resistivity of samples which show no growth, or only trace amounts of growth. (9) Measure the surface resistivity of the control samples which have been incubated under the same conditions for the same period of time. (10) Calculate the average surface resistivity of each set of samples. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1967
- Accession Number
- AD0660250
Entities
People
- P. O. Nicodemus
Organizations
- General Electric