ICS number: 91.100.40
RTCR 491: 2017 Materiales de Construcción. Láminas de Fibrocemento. Especificaciones (Costa Rican Technical Regulation (RTCR) No 491:2017: Building Materials. Fiber-cement sheets. Specifications) (19 pages, in Spanish)
The notified Technical Regulation establishes the specifications to be met by fibre-cement flat sheets and all sheets having the compositional characteristics defined in paragraph 3.10 (regardless of their trade description) intended for use in the country.