ISO 19821:2017 pdf download.Determination of span rating for natural fibre-reinforced plastic composite (NFC) deck boards
1 Scope
This document specifies the procedures to establish a span rating for natural fibre-reinforced plastic composite (NFC) deck boards and deck boards used as stair treads, provided that the stair treads are produced from the same materials and processing techniques as the deck boards. This document covers test methods of performance, acceptance criteria and determination of span rating. It is intended to establish the basis for code recognition of deck boards used in exterior applications where combustible construction is allowed.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 4892-2:2013, Plastics — Methods of exposure to laboratory light sources — Part 2: Xenon-arc lamps
ISO 16616:2015, Test methods for natural fibre-reinforced plastic composite (NFC) deck boards
EN 15534-1:2014, Composites made from cellulose-based materials and thermoplastics (usually called wood-polymer composites (WPC) or natural fibre composites (NFC)) — Part 1: Test methods for characterization of compounds and products
ASTM D7032-17, Standard Specification for Establishing Performance Ratings for Wood-Plastic Composite and Plastic Lumber Deck Boards, Stair Treads, Guards, and Handrails
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1 natural fibre-reinforced plastic composite
NFC
product made thereof being the result of the combination of one or several cellulosic materials with one or several thermoplastics
3.2 flexural strength
maximum load achieved by the test specimen during flexural test, and reported as modulus of rupture (MOR)
6 Conditioning
Prior to testing, all specimens shall be conditioned to environmental conditions appropriate for the intended end-use of the product. Alternatively, the test specimens used for the determination of the product performance shall be conditioned for a minimum of 72 h and testing shall be carried out at the standard atmosphere 23/50 (23 °C ± 2 °C, 50 % ± 5 % RH) in accordance with ISO 291. When the product is to be subjected to a water soak environment, the test specimens shall be tested within 30 min upon removal from the treatment.
7 Evaluation methods of performance
7.1 General
Deck boards and stair treads are structural elements and shall be tested in flexure to establish a span rating. For products often used in diverse outdoor environments, the temperature and moisture effects (see 7.2) shall be used in the determination of the span rating. In addition, several other performance measures shall be evaluated and used to adjust the span rating in order to assist in the proper installation and using, including tests on ultraviolet resistance (see 7.3), freeze-thaw resistance (see 7.4), biodeterioration effects (see 7.5), creep-recovery (see 7.6), and creep-rupture (see 7.7), mechanical fastener holding capacity (see 7.8), and slip resistance (see 7.9).
ISO 19821:2017 pdf download
