Gummi- och plastindustri

Ämnesområden: Gummi
Kommittébeteckning: SIS/TK 154 (Gummi och gummiprodukter)
Källa: ISO
Svarsdatum: den 6 okt 2022
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ISO 9924-1:2016 specifies a thermogravimetric method for the determination of the total organic content, carbon black content and ash in vulcanizates and uncured compounds. The loss in mass at 300 °C is an approximate guide to the volatile-matter content of the compound.

The method is suitable for the analysis of rubber compounds and vulcanizates containing the following rubbers occurring alone or as mixtures:

a) polyisoprene of natural or synthetic origin;

b) polybutadiene;

c) styrene-butadiene copolymers;

d) isobutylene-isoprene copolymers;

e) ethylene-propylene copolymers and related terpolymers.

NOTE The field of application of the method may be extended to the analysis of compounds containing rubbers different from those given in this subclause, provided that the applicability of the method is tested beforehand using known compounds or vulcanizates having a similar composition. Other compounds are covered in ISO 9924‑2.

The method is not suitable for rubbers containing polymers which form a carbonaceous residue during pyrolysis, such as many chlorine- or nitrogen-containing rubbers.

The method is also not suitable for materials containing additives which cause the formation of carbonaceous residues during pyrolysis, such as cobalt and lead salts or phenolic resins.

The method is not suitable for compounds containing mineral fillers, such as carbonates or hydrated aluminium oxides, which decompose in the temperature range from 25 °C to 650 °C, unless suitable corrections based on prior knowledge of filler behaviour can be made.

The method is not suitable for the determination of the total polymer content of compounds or vulcanizates containing non-rubber organic ingredients that cannot be completely removed by solvent extraction carried out in accordance with ISO 1407.

Ämnesområden: Cellmaterial
Kommittébeteckning: SIS/TK 156 (Plast)
Källa: ISO
Svarsdatum: den 17 okt 2022
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This document specifies a method of determining the water vapour transmission rate, water vapour permeance, water vapour permeability and water vapour diffusion resistance index for rigid cellular
plastics.
The scope of this method provides for the testing of rigid cellular materials that have thicknesses from 10 mm upwards and which may, as an integral part of the material, contain natural skins or adhered facings of some different material.
Three different sets of temperature and humidity conditions are provided, as follows:
a) 38 °C and a relative-humidity gradient across the test specimen of 0 % to 88 %
b) 23 °C and a relative-humidity gradient across the test specimen of 0 % to 85 %
c) 23 °C and a relative-humidity gradient across the test specimen of 0 % to of 50 %
The results obtained by this method are suitable for design purposes and production control, and for inclusion in product specifications.
The method is suitable for materials which have water vapour transmission rates in the range 3 μg/ (m2⋅s) to 1400 μg/(m2⋅s).

Kommittébeteckning: SIS/TK 156 (Plast)
Källa: CEN
Svarsdatum: den 24 okt 2022
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This document specifies the classifications, requirements and test methods for unplasticized poly(vinyl chloride) (PVC-U) profiles covered with foils designed for external uses bonded with adhesives which are intended to be used for the fabrication of windows and doors.
NOTE 1 For editorial reasons, in this document, the term “window” is used for window/door.
NOTE 2 Profiles made from PVC-U materials with reinforcements (e.g. glass fibres) are not covered by this document.
NOTE 3 For the purpose of production control, test methods other than those specified in this document can be used.

Ämnesområden: Plast: allmänt
Kommittébeteckning: SIS/TK 156 (Plast)
Källa: CEN
Svarsdatum: den 3 nov 2022
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1.1 This International Standard specifies two methods (method A and method B) for the determination of the tensile-impact strength of plastics under defined conditions. The tests can be described as tensile tests at relatively high strain rates. These methods can be used for rigid materials
(as defined in ISO 472), but are especially useful for materials too flexible or too thin to be tested with impact tests conforming to ISO 179 or ISO 180.
1.2 These methods are used for investigating the behaviour of specified specimens under specified impact velocities, and for estimating the brittleness or the toughness of specimens within the limitations
inherent in the test conditions.
1.3 These methods are applicable both to specimens prepared from moulding materials and to specimens taken from finished or semi-finished products (for example mouldings, laminates, or extruded or cast sheets).
1.4 Results obtained by testing moulded specimens of different dimensions may not necessarily be the same. Equally, specimens cut from moulded products may not give the same results as specimens of the
same dimensions moulded directly from the material. Test results obtained from specimens prepared from moulding compounds cannot be applied directly to mouldings of any given shape, because values may depend on the design of the moulding and the moulding conditions. Results obtained by method A and method B may or may not be comparable.
1.5 These methods are not suitable for use as a source of data for design calculations on components. Information on the typical behaviour of a material can be obtained, however, by testing different types of test specimen prepared under different conditions, and by testing at different temperatures. The two different methods are suitable for production control as well as for quality control.

Kommittébeteckning: SIS/TK 154 (Gummi och gummiprodukter)
Källa: ISO
Svarsdatum: den 10 nov 2022
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This document specifies requirements for materials used in vulcanized rubber seals for the following:
a) cold drinking-water supplies (up to 50 °C);
b) drainage, sewerage, and rainwater systems (continuous flow up to 45 °C and intermittent flow up to 95 °C).
The different designations of seals specified are defined according to their type, application, and requirements (see Table 5).
General requirements for finished joint seals are also given; any additional requirements called for by the particular application are specified in the relevant product standards, taking into account that the performance of pipe joints is a function of the seal material properties, seal geometry, and pipe joint design. This document is intended to be used, where appropriate, with product standards which specify performance requirements for joints.
This document is applicable to joint seals for all pipeline materials, including iron, steel, clay, fibre cement, concrete, reinforced concrete, plastics, and glass-reinforced plastics.
It is applicable to elastomeric components of composite or non-composite seals. In the case of composite seals for materials of hardness ranges from 76 IRHD-M to 95 IRHD-M, the requirements for elongation
at break, compression set, and stress relaxation apply only when the material is participating in the sealing function or in the long-term stability of the seal.
Joint seals made with an enclosed void as part of their design are included in the scope of this document.