NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Evaluation of flammability for cable-like polymersA new test method is developed for the flammability of insulated electric cables as well as polymers formed in the cables. The rate of downward flame spread along the polymer surface is measured by a technique in which the flame is stopped at a particular position by winding up the cable at the same speed as the flame spreading rate, with external preheating by an electric furnace having oxidative gas flow. The polymer burns continuously without change of flame condition and the rate is obtained from the winding speed of the cable. A flame spread equation relates the flame spreading rate (V) of the cable-like polymer to O concentration (Yo) and the atmosphere, the preheating temperature, and the pyrolysis temperature for polymer burning. Plotting log V vs. log Yo for experimental results allows evaluation of the flammability of polymers, with discrimination between the effects of O concentration, heating temperature, and specimen shape. Results with various types of PVC electrical cable indicated the validity of the method. Application of the method to the cables in groups showed a flame retardation behavior different from the case of a single cable, in a atmosphere of high O concentration.
Document ID
19880011092
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mikado, Tuneo
(NASA Headquarters Washington, DC United States)
Akita, Kazuo
(NASA Headquarters Washington, DC United States)
Date Acquired
September 5, 2013
Publication Date
April 1, 1988
Subject Category
Nonmetallic Materials
Report/Patent Number
NAS 1.77:20225
NASA-TT-20225
Accession Number
88N20476
Funding Number(s)
CONTRACT_GRANT: NASW-4307
Distribution Limits
Public
Copyright
Public Use Permitted.
Document Inquiry

Available Downloads

There are no available downloads for this record.
No Preview Available