Scanning electron microscope examination of samples from Herty Foundation in development of fluoride-resistant HEPA filter media. [Fibermat and paper formulations using mixtures of asbestos fiber and Johns-Manville L-134 fibers]

Technical Report · Tue Feb 01 00:00:00 EST 1977

DOI:https://doi.org/10.2172/7112837· OSTI ID:7112837

Petit, G S; Weber, C W

According to a limited number of SEM photomicrographs, the tensile strength increase of the filter mats and paper formulated with asbestos and L-134 fibers is caused by gradual attack on the fibers by the corrosive environment (moist air-HF-F/sub 2/) and buildup of fluoride salts on the fiber surfaces. These deposits cause cross-linkage or interfiber growth, which accounts for the increase in tensile strength. Longer exposures show evidence of the fibers becoming brittle. The brittle fibers would shear more easily and reduce the tensile strength.

• Research Organization: Oak Ridge Gaseous Diffusion Plant (K-25), Oak Ridge, TN (United States)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 7112837
• Report Number(s): K/TL-639
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
AIR FILTERS
PERFORMANCE TESTING
FLUORINE
HYDROFLUORIC ACID
PHOTOMICROGRAPHY
TENSILE PROPERTIES
ELEMENTS
EQUIPMENT
FILTERS
HALOGENS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MECHANICAL PROPERTIES
NONMETALS
PHOTOGRAPHY
POLLUTION CONTROL EQUIPMENT
TESTING
420202* - Engineering- Protective Structures & Equipment