Reference  records a commercial glass composition for "E-glass," commonly used for commercial applications of fibrous glass (by mass): Si[O.
This difference in ambient pressure, however, has an extremely small effect on the thermal conductivity of fibrous glass board due to its relatively large pore size [7, 16-18, 26].
This addendum provides supplementary information on the early history of the NBS measurement program for fibrous glass board, selection of the original source material, conversion of the measurement service to become part of the NIST SRM program, and the resulting impact.
The first test record for "NBS Fibrous Glass Board" was documented in the hot-plate laboratory logbook on March 11, 1958; the final measurement under the calibration program, November 29, 1977.
The first lot of fibrous glass insulating material, lot 1958, was procured from a commercial source.
1] estimate is consistent with previous results (8) obtained for SRM 1450c, Fibrous Glass
At present, respirable fibrous glass
is classified as a "possible carcinogen" following 1987 research by LARC in which glass fibers were surgically implanted directly into body cavities, with cancerous tumors as the result.
They also reviewed the many animal inhalation studies of fibrous glass
and found no evidence of lung scarring or cancer in the exposed animals.