Chemie a potravinářství

Oblast zaměření: Potravinářské produkty
Komise : CEN/TC 307 (Oilseeds, vegetable and animal fats and oils and their by-products - Methods of sampling and analysis)
Původce: CEN
K připomínkám do: 21.07.2019
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This International Standard specifies three methods (two titrimetric and one potentiometric) for the determination of the acidity in animal and vegetable fats and oils, hereinafter referred to as fats. The acidity is expressed preferably as acid value, or alternatively as acidity calculated conventionally.

This International Standard is applicable to refined and crude vegetable or animal fats and oils, soap stock fatty acids or technical fatty acids. The methods are not applicable to waxes.

Since the methods are completely non-specific, they cannot be used to differentiate between mineral acids, free fatty acids, and other organic acids. The acid value, therefore, also includes any mineral acids that may be present.

Milk and milk products (or fat coming from milk and milk products) are excluded from the scope of ISO 660.

Oblast zaměření: Produkty z biomasy
Komise : CEN/TC 454 (Algae and algae products)
Původce: CEN
K připomínkám do: 5.08.2019
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This document defines the terms related to functions, products, and properties of algae and algae products. In order to better pack the methodologies, algae are regarded as a functional group of organisms consisting of microalgae, macroalgae, cyanobacteria and Labyrinthulomycetes.

Oblast zaměření: Lepidla
Komise : CEN/TC 193 (Adhesives)
Původce: CEN
K připomínkám do: 12.08.2019
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This document specifies a measuring method for the characterization of rheological properties of structural adhesives using oscillatory rheometry. The advantage of the method in comparison to rotational viscometry measurements lies in the separation of elastic and viscous material properties, thus allowing to define the viscoelastic properties. This enables more precise information concerning the flow behaviour of the materials, thereby resulting in a better understanding of their processing properties.

The method described is particularly suitable for filled and paste-like adhesives. These are frequently processed using automated pump and application systems in industrial applications and will be set precisely considering their rheological properties. As the rheological behaviour of uncured adhesives is mostly independent of their properties in the cured state, the standard can also serve for the examination of non-structural adhesives.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 19.08.2019
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This document defines terms of the procedure for determining the adhesion of an organic coating to a metallic substrate after indentation produced by slow deformation.

The resistance to cracking can also be evaluated.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 19.08.2019
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This document specifies test procedures for assessing the effect of chemicals on the characteristics of an organic coating on a metallic substrate. It covers testing by using defined substances and to assess the change in characteristics such as discoloration, change in gloss, blistering, softening, swelling and loss of adhesion. Assessment of other phenomena can be agreed between the interested parties.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 19.08.2019
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This document describes a laboratory method for testing foam adhesion to an organic coating on a metallic substrate under dry and wet conditions.

Komise : CEN/TC 298 (Pigments and extenders)
Původce: CEN
K připomínkám do: 2.09.2019
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This document gives the definition for the term extender and specifies test methods that are required for most of the subsequent parts of ISO 3262.

The subsequent parts of ISO 3262 specify requirements and the corresponding methods of test for extenders for use in paints, related coating materials and other applications.