AS NZS 3813:2016 pdf free.Plastic monobloc chairs—Determination of strength and durability, stability, UV and weathering, and ignitability.
1.3.12 Strength tests
Tests consisting of heavy loads being applied a few times to ensure that the chair has sufficient strength to perform its function under the highest levels of loading that might reasonably be expected to occur. (See Clauses 2.4.1 to 2.4.5, 2.4.9 and 2.4.10.)
1.4 MARKING
1.4.1 General
All chairs shall be adequately and clearly marked when supplied. The information provided shall include the items in Clause 1.4.2.
1.4.2 Marking
All chairs shall be clearly and durably marked with the following:
(a) The manufacturer’s or importer’s name and address.
(b) Date of manufacture.
(c) That the chair is not suitable for shower or bathroom use.
(d) An industry-accepted recyclability and materials identification code.
(e) The Sections of this Standard (AS/NZS 3813) to which it is claimed to be compliant and, if appropriate, at what level.
(f) Whether the chair is stackable or non-stackable.
1.5 PRODUCT CONFORMITY
This Standard includes two levels of compliance for strength and durability, one level for stability, two levels for UV and weathering (and an additional ‘non-compliant’ one for indoor use only), and one level for ignitability. An item may be tested to any section of the Standard but compliance to the strength, durability and stability sections are intended to be core requirements, with UV and weathering, and the ignitability sections intended as adjuncts to be specified where appropriate.
The two levels of strength and durability compliance, normal and heavy duty, are distinguished by the number of load application cycles, not the magnitude of the loads applied. The heavy duty level is subject to twice the number of load application cycles in both the strength and durability tests.
Meeting the requirements of either of the UV and weathering section’s levels of compliance indicates the chair is suitable for outdoor use and that the chair’s polymer did not show any significant change in appearance such as blistering, chalking, cracking, crazing or major colour change until after the specified exposure period. These changes in appearance are indicative of declining mechanical properties, that is, a reduction in the polymer’s tensile strength and toughness or an aesthetic change which the consumer may consider unacceptable.
For the lower level of UV and weathering compliance, intended for intermittent outdoor
use, the exposure period is 1000 light-hours (41.7 days) in a Xenon weatherometer
(in accordance with SAE J2527, SAE J1960, ASTM G155-13 Cycle 1 or 2 or ISO 4892-2
Cycle I or 2) and includes being subjected to a water spray to simulate the effect of rain.
For the higher level of compliance, where more frequent or continuous outdoor exposure is anticipated, the exposure period is 2000 light-hours (83.3 days).
For either level, if a dark cycle is included in the program, the overall test time shall increase accordingly to compensate.AS NZS 3813 pdf download.