Documents in our library describe Mill Board (Ruberoid) as “asbestos mill board (commercial grade)”.1 They give it as made 1928–1967.2 The asbestos named is chrysotile. It was rated for temperatures up to 1000 °F.1 Where the documents differ, each is listed below with its source.
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What each document says
Every statement about Mill Board (Ruberoid) in the documents, in each document's own words.
Union Carbide Chemicals Company: Thermal Insulation and Accessories Manual (1962)
- Description: “Asbestos fibers mixed with inorganic binding materials formed under pressure into dense hard sheets. Sheets from 1/32 in. to 1/2 in. thick, 42 in x 48 in.”, p. 961
- Form: “Asbestos Mill Board (Commercial Grade)”, p. 961
- Asbestos content: “Asbestos fibers mixed with inorganic binding materials”, p. 961
- Temperature limit: “0 to 1000”, p. 961
Asbestos; Publication of Identifying Information (1990)
- Made from: “Asbestos Paper and Millboard Products (produced by Ruberoid from 1928 to 1967 ...)”, said by GAF Building Materials Corporation, as recorded by U.S. EPA, Federal Register 55 FR (Feb. 13, 1990), p. 82
- Binder: “bonded with portland cement and/or starch”, said by GAF Building Materials Corporation, as recorded by U.S. EPA, Federal Register 55 FR (Feb. 13, 1990), p. 82
- Fiber grade: “usually grades 5D, 5R, and 6D”, said by GAF Building Materials Corporation, as recorded by U.S. EPA, Federal Register 55 FR (Feb. 13, 1990), p. 82
- Description: “a stiffer product than asbestos paper or rollboard, manufactured in sheets of varying thicknesses according to customer specifications”, said by GAF Building Materials Corporation, as recorded by U.S. EPA, Federal Register 55 FR (Feb. 13, 1990), p. 82
- Asbestos fiber: “Millboard consisted generally of chrysotile asbestos”, said by GAF Building Materials Corporation, as recorded by U.S. EPA, Federal Register 55 FR (Feb. 13, 1990), p. 82
Asbestos Magazine, 1931, May 1931
- Description: “ASBESTOS MILL BOARD”, p. 583
Kind of product
We list Mill Board (Ruberoid) with asbestos-cement pipe, board and sheet, from how the documents describe its form. That page explains how such products exposed workers.
Trades that worked with products like it: Carpenters and Construction Workers.
Other asbestos-cement pipe, board and sheet by Ruberoid (15)
Asbestos-cement pipe, board and sheet by other makers (368)
Flexboard (Johns-Manville) · Thermobestos · Careytemp (Philip Carey) · Min-k (Johns-Manville) · Unibestos (Union Asbestos & Rubber Co.) · Marinite 36 (Johns-Manville) · Marinite 45 (Johns-Manville) · Marinite 65 (Johns-Manville) · Marrakech (Johns-Manville) · Metal Veneered Marinite (Johns-Manville) · Metal-on (Johns-Manville) · Micro-Flexboard (J/Hns-Manville) · Min-k 1301 (Johns-Manville) · Min-k 500 (Johns-Manville) · Miraweld (Kaiser Refractories) · Molten Metal Marinite (Johns-Manville) · Monobestos (Keasbey & Mattison) · Monobestos (Nicolet) · Mule-Hide (Lehon) · Narro-Side (Supradur) · and 348 more: all asbestos-cement pipe, board and sheet
See also
- Ruberoid: the company's history, documents, people, products and plants
- Ruberoid on our products page: what the documents say about the company's asbestos products, with sources
References
- Union Carbide Chemicals Company: Thermal Insulation and Accessories Manual (October 1, 1962), p. 96.
- Asbestos; Publication of Identifying Information (February 13, 1990), p. 8.
- Asbestos Magazine, 1931, May 1931 (May 1, 1931), p. 58.
Cite this page
“Mill Board (Ruberoid).” AsbestosClaims.Law Library. https://asbestosclaims.law/library/products/ruberoid-mill-board.
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