Documents in our library describe Woodrock (National Gypsum) as “fire-resistant clapboards and panels”.1 They give it as sold from 1962.2 Where the documents differ, each is listed below with its source.
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What each document says
Every statement about Woodrock (National Gypsum) in the documents, in each document's own words.
Asbestos Magazine, 1969, June 1969
USPTO trademark case files (Trademark Full Text XML Data, Annual Applications, 2025 edition)
- Sold from: “first used in commerce 1962-09-21”, said by NATIONAL GYPSUM COMPANY, as recorded by U.S. Patent and Trademark Office2
- Description: “ASBESTOS-CEMENT BUILDING BOARDS, INCLUDING CLAPBOARDS, PANELS, BATTENS, AND TRIM”, said by NATIONAL GYPSUM COMPANY, as recorded by U.S. Patent and Trademark Office2
Asbestos Magazine, 1964, December 1964
- Description: “combination of wood, asbestos fibers and portland cement that looks and cuts like wood but weathers like brick or rock”, p. 63
Asbestos Magazine, 1966, April 1966
- Made at: “the company's St. Louis, Missouri, plant”, said by National Gypsum Company, as recorded by Asbestos (magazine), p. 214
Sourcebook on Asbestos Diseases: Medical, Legal, and Engineering Aspects, Volume Two
- Description: “wood, asbestos, & Portland cement siding” (as of 1964, 1970), p. 1255
Kind of product
We list Woodrock (National Gypsum) with asbestos-cement pipe, board and sheet and refractories, from how the documents describe it. Those pages explain how such products exposed workers.
Trades that worked with products like it: Boilermakers, Carpenters and Construction Workers, Refractory Bricklayers.
Other asbestos-cement pipe, board and sheet by National Gypsum (12)
Asbestone · Asbestos Permaboard · Asbestone 400 · Economy 250 · Pliaboard · Chroma-Tone · Classic-Shake · Humigard · Pps · Ranch Style · Sussex 32 · Therm-O-Tec
Asbestos-cement pipe, board and sheet by other makers (371)
Flexboard (Johns-Manville) · Thermobestos · Careytemp (Philip Carey) · Min-k (Johns-Manville) · Unibestos (Union Asbestos & Rubber Co.) · Vitramic (maker not given) · Vitramic (Ruberoid) · Vitribestos (Johns-Manville) · Vitricel (Philip Carey) · Vitro Fire Felt (Johns-Manville) · Watcocell (GAF) · Woodrock (Gold Bond Bldg. Products (National Gypsum)) · Xxx Asbestos Millboard (Johns-Manville) · Xxx Millboard (Johns-Manville) · Yankee (Beacon Sales Company) · "Not A Kick In A Million Feet" (Lehon) · 'Century' Apac (Keasbey & Mattison) · 101 (Johns-Manville) · 101 Asbestos Millboard (Johns-Manville) · 101 Mobilene Sheet (Johns-Manville) · and 351 more: all asbestos-cement pipe, board and sheet
Refractories by other makers (51)
319 Semi-refractory (Johns-Manville) · 678 Semi-refractory (Johns-Manville) · 106 (Eagle-Picher) · Aerogun (North American Refractories) · Alumino-Hi-Temp (Philip Carey) · Super 505 Hot Gun C (North American Refractories) · Thermo-Chem (Johns-Manville) · Thermo-Pac (Johns-Manville) · Thermo-Pac 2700 (Johns-Manville) · Vitricel (Philip Carey) · Windsor Brick (GAF) · Wo-339 MC Gun (North American Refractories) · "Not A Kick In A Million Feet" (Lehon) · Anti-erode Trowel (North American Refractories) · Bof-cote (North American Refractories) · Bof-patch (North American Refractories) · Bromley's Honor Pledge (George W. Bromley) · Cellotone (Norristown Magnesia & Asbestos Company) · CM Gun Mix (North American Refractories) · Cm-18 Gun Mix (North American Refractories) · and 31 more: all refractories
See also
- National Gypsum: the company's history, documents, people, products and plants
- National Gypsum on our products page: what the documents say about the company's asbestos products, with sources
References
- Asbestos Magazine, 1969, June 1969 (June 1, 1969), p. 4.
- USPTO trademark case files (Trademark Full Text XML Data, Annual Applications, 2025 edition) (June 19, 1963). Not yet published in our library.
- Asbestos Magazine, 1964, December 1964 (December 1, 1964), p. 6.
- Asbestos Magazine, 1966, April 1966 (April 1, 1966), p. 21.
- Sourcebook on Asbestos Diseases: Medical, Legal, and Engineering Aspects, Volume Two (1986), p. 125. Not yet published in our library.
Cite this page
“Woodrock (National Gypsum).” AsbestosClaims.Law Library. https://asbestosclaims.law/library/products/national-gypsum-woodrock.
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This page is provided for general informational purposes and does not constitute legal advice. Every asbestos case turns on its own facts, exposure history, diagnosis, deadlines, available evidence, and applicable law. Reviewing this page does not create an attorney-client relationship. For advice about your specific situation, call 833-4-ASBESTOS for a free case review.