Gummi- och plastindustri

Kommittébeteckning: SIS/TK 118 (Rörledningsprodukter och ventiler)
Källa: CEN
Svarsdatum: den 31 okt 2020
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This International Standard specifies a test method for the determination of the opening and closing torque of thermoplastics valves.

This International Standard applies to all types of thermoplastics valves intended to be used for the transport of fluids according to ISO 16135, ISO 16136, ISO 16138, ISO 16139, ISO 21787.

It does not specify the relationship between the torque and its possible increase after valve prolonged use at specific working condition or materials wear/chemical aggression.

NOTE Concerning the chemical aggression of the materials, a collection of data is reported in ISO/TR 10358[1], concerning the endurance test necessary to confirm the ability of hand-operated plastics valves to withstand prolonged use, with repeated opening and closure, information are given in ISO 8659[2].

Ämnesområden: Plast: allmänt
Kommittébeteckning: SIS/TK 156 (Plast)
Källa: ISO
Svarsdatum: den 2 nov 2020
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This document specifies test methods for the measurement of the physical degradation of samples made with plastics materials when exposed to marine environmental matrices under aerobic conditions at laboratory scale.

Plastics samples can be exposed to three different test conditions and different marine matrices: buried into a wet sandy marine sediment; at the interface between a marine sandy sediment and the water column; to seawater.

The conditions applied in these test methods are designed to determine the degradation rates of plastics materials and give an indication of their propensity to physical degradation and disintegration in natural environments.

Degradation rates considered in this document are mass loss rate, erosion rate, and mechanical properties loss. Disintegration, i.e. physical breakdown of a sample into very small fragments (<2mm) can also be assessed.

The test design (i.e. the total number of tested samples, the number of replicates and of repeated measurements) of the test methods is flexible. The complexity of test design and the cost of testing can be modulated according to the requests and purposes of the client. For example, tests planned for results delivered under statistically optimal conditions can be arranged for certification purposes, while simpler tests can be arranged for screening purposes.

This document is not suitable for the assessment of degradation caused by heat (thermo-degradation) or light exposure (photo-degradation).

Ämnesområden: Däck för vägfordon
Kommittébeteckning: SIS/TK 218 (Däck och hjul)
Källa: ISO
Svarsdatum: den 9 nov 2020
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This International Standard specifies the method for measuring relative ice grip performance index of a candidate tyre compared to a reference, under loaded conditions for new tyres intended to be used on passenger car on an ice surface.

The method developed here is meant to reduce the variability of the performance measurement. The use of the proper reference tyre is necessary to limit the variability of the testing method procedures.

This International Standard applies to all passenger car tyres.