ASTM C1186-26

Detail information

Designation: ASTM C1186-26

Publication date: 01/04/2026

Pages: 4

Country: American technical standard

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Anotation

This specification covers either untextured or surface textured non-asbestos fiber-cement flat sheets intended for exterior applications such as claddings, facades, curtain walls, soffits, and so forth. This specification does not apply to asbestos-cement flat sheets, gypsum-based boards or particle boards, discrete non-asbestos fiber-cement interior substrate sheets, fiber-mat reinforced non-asbestos cement interior substrate sheets, or cement-bonded particleboards. Flat sheets covered here are divided into two types according to their intended application, and four grades according to their flexural strengths. Type A sheets are intended for exterior applications subjected to the direct action of sun, rain, or snow, while Type B sheets are intended for exterior applications not subjected to the direct action of sun, rain, or snow. Sheets shall adhere to the following mechanical and physical requirements: flexural strength, density, dimension (nominal length, width, and thickness, squareness, and edge straightness), finish, and color.


Keywords:
air cured, appearance, autoclaved cured, cellulose fiber, density, edge straightness, exterior application, finish, flexural strength, frost resistance, heat/rain resistance, inspection, length and width tolerance, mechanical properties, minimum equilibrium strength, minimum wet strength, moisture content, moisture movement, nominal length, nominal thickness, nominal width, non-asbestos fiber, packaging, physical properties, polyethylene fiber, polyvinyl alcohol fiber, pressure cured, rejection