Chemie a potravinářství

Oblast zaměření: Potravinářské produkty
Komise : CEN/TC 275 (Food analysis - Horizontal methods)
Původce: CEN
K připomínkám do: 24.09.2019
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This document describes a procedure for the determination of aflatoxins B1, B2, G1 and G2 and total aflatoxins (sum of B1, B2, G1 and G2) in spices for which EU maximum levels are established, other than paprika, by high performance liquid chromatography (HPLC) with post-column derivatization (PCD) and fluorescence detection (FLD) after immunoaffinity column clean-up.

The method is applicable to the spices capsicum, pepper, nutmeg, ginger, turmeric and mixtures thereof.

The method has been validated for aflatoxins B1, B2, G1 and G2 and total aflatoxins in a range of test samples that comprised: ginger, pepper, nutmeg, chilli, turmeric as individual spices and mixed pepper+chilli+nutmeg (90+5+5, m+m+m), mixed spice+ginger (6+4, m+m) mixed spice, mixed turmeric+ginger (2+8, m+m).

The validation was carried out over the following concentration ranges: aflatoxin B1 = 1 µg/kg to 16 µg/kg and total aflatoxins = 2,46 µg/kg to 36,1 µg/kg.

Oblast zaměření: Potravinářské produkty
Komise : CEN/TC 275 (Food analysis - Horizontal methods)
Původce: CEN
K připomínkám do: 24.09.2019
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This document describes a method for the determination of the sum total of six ergot alkaloids (ergocornine, ergometrine, ergocristine, ergotamine, ergosine and ergocryptine) and their -inine epimer pairs by liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) after clean-up by dispersive solid phase extraction (SPE).

The method has been validated for cereals and cereal-based food products.

The method has been validated in the range 13,2 µg/kg to 168 µg/kg for the sum of the twelve ergot alkaloids, in rye flour, rye bread and cereal products (breakfast cereal, infant breakfast cereal, and crispbread) that contained rye as an ingredient, as well as seeded wholemeal flour and a barley and rye flour mixture.

Method performance was satisfactory in the range 24,1 µg/kg to 168 µg/kg, however at lower concentrations RSDR values were greater than 44 %, and HorRat values exceeded 2,0, indicating the method may not be fully suitable at concentrations below 24 µg/kg for sum of ergot alkaloids, although it is suitable for screening at these concentrations. Method performance may be improved by inclusion of an isotopically labelled internal standard, but this was not available at the time of the method validation study.

Oblast zaměření: Lepidla
Komise : CEN/TC 193 (Adhesives)
Původce: CEN
K připomínkám do: 30.09.2019
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This document specifies test methods for the determination of the suitability of two- component epoxy and polyurethane adhesives for on-site repair of cracks in timber structures made of solid wood, finger-jointed solid wood, glued solid timber and glued laminated timber made of softwood species by injection of the repair adhesive. The adhesive can also be used to rehabilitate cracks in the area of joints made by nails, screws, dowel-type fasteners and dowels with threads. The adhesive can also be used to fill gaps between the faces of structural components. This document specifies minimum requirements on bond strength and integrity and dimensions of fissures, cracks and openings. This document provides also minimum on-site repair provisions and specifies quality control tests at the structures repaired by bonding.

This document also covers the repair of surface treated wood. It does not cover the repair of modified and stabilized wood with considerably reduced swelling and shrinkage properties, e.g. such as acetylated wood, heat treated wood, polymer impregnated wood and preservative treated wood.

The adhesive is intended for the repair of load bearing timber structures not subjected to temperatures more than 60 °C over a longer time in service classes 1 and 2, see EN 1995-1-1 which are loaded predominantly static or quasi static, see EN 1990 and EN 1991-1-1. A verification of quality and glue line integrity of the on-site repair bonding is given in an informative Annex A.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 27.10.2019
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This document specifies a method for determining the fineness of grind of paints, inks and related products by use of a suitable gauge, graduated in micrometres.

It is applicable to all types of liquid paints and related products, except products containing pigments in flake form (e.g. glass flakes, micaceous iron oxides, zinc flakes).

Of the three gauges referred to in 4.1, the 100 µm gauge is suitable for general use, but the 50 µm and especially the 25 µm gauge will only provide reliable results in the hands of skilled laboratory personnel. Particular caution is necessary in interpreting readings of less than 10 µm.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 28.10.2019
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This document specifies a test method for assessing the resistance of paint coatings to separation from substrates when a right-angle lattice pattern is cut into the coating, penetrating through to the substrate. The property determined by this empirical test procedure depends, among other factors, on the adhesion of the coating to either the preceding coat or the substrate. This procedure is not to be regarded, however, as a means of measuring adhesion.

Where a measurement of adhesion is required, the method described in ISO 4624[1] may be used.

NOTE 1   Although the test is primarily intended for use in the laboratory, the test is also suitable for field testing.

The method described may be used either as a pass/fail test or, where circumstances are appropriate, as a six-step classification test. When applied to a multi-coat system, assessment of the resistance to separation of individual layers of the coating from each other can be made.

The test can be carried out on finished objects and/or on specially prepared test specimens.

Although the method is applicable to paint on hard (e.g. metal) and soft (e.g. wood and plaster) substrates, these different substrates need a different test procedure (see Clause 6).

The method is not suitable for coatings of total thickness greater than 250 µm or for textured coatings.

NOTE 2   The method, when applied to coatings designed to give a rough patterned surface, will give results which will show too much variation (see also ISO 16276‑2[2]).

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 28.10.2019
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This document specifies a test procedure for assessing the scratch resistance of organic paint coatings, in particular paint coatings used in the automotive industry (i.e. for assessing their car-wash resistance). Machine-based washing is simulated in the laboratory environment using a rotating brush and synthetic dirt. The test conditions have been designed to be as close as possible to the real conditions in a car-wash. If the test parameters are suitably chosen, the method can also be used for testing protective plastics films and plastics components.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 3.11.2019
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This is one of a number of parts of ISO 11127 dealing with the sampling and testing of non-metallic abrasives for blast-cleaning.

The types of non-metallic abrasive and requirements on each are contained in ISO 11126.

The ISO 11126 and ISO 11127 series have been drafted as a coherent set of International Standards on non-metallic blast-cleaning abrasives. Information on all parts of both series is given in Annex A.

This part of ISO 11127 specifies a method of assessing whether a non-metallic blast-cleaning abrasive has a minimum hardness of 6 on Mohs' scale.

NOTE       The test described in this part of ISO 11127 is a pass/fail test and is not a method for the accurate determination of hardness.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 3.11.2019
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This is one of a number of parts of ISO 11127 dealing with the sampling and testing of non-metallic abrasives for blast-cleaning.

The types of non-metallic abrasive and requirements on each are contained in ISO 11126.

The ISO 11126 and ISO 11127 series have been drafted as a coherent set of International Standards on non-metallic blast-cleaning abrasives. Information on all parts of both series is given in Annex A.

This part of ISO 11127 specifies a method for the determination of the level of free moisture present in non-metallic blast-cleaning abrasives. It is determined by measuring the mass lost on heating.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 3.11.2019
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This is one of a number of parts of ISO 11127 dealing with the sampling and testing of non-metallic abrasives for blast-cleaning.

The types of non-metallic abrasive and requirements on each are contained in ISO 11126.

The ISO 11126 and ISO 11127 series have been drafted as a coherent set of International Standards on non-metallic blast-cleaning abrasives. Information on all parts of both series is given in Annex A.

This part of ISO 11127 specifies a method for the determination of the particle size distribution of non-metallic blast-cleaning abrasives by sieving.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 3.11.2019
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This is one of a number of parts of ISO 11127 dealing with the sampling and testing of non-metallic abrasives for blast-cleaning.

The types of non-metallic abrasive and requirements on each are contained in ISO 11126.

The ISO 11126 and ISO 11127 series have been drafted as a coherent set of International Standards on non-metallic blast-cleaning abrasives. Information on all parts of both series is given in Annex B.

This part of ISO 11127 specifies a method for the sampling of non-metallic blast-cleaning abrasives from consignments and for the subdivision of the sample into quantities suitable for undertaking the appropriate test methods specified in other parts of ISO 11127.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 5.11.2019
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This part of EN 12206 specifies requirements and the corresponding methods of test relating to the organic coating of aluminium and aluminium alloy extrusions, sheet and preformed sections for architectural purposes, using coating powders. It also describes:

a)     the pretreatment of the substrate prior to the coating process;

b)    the coating powder;

c)     the coating process;

d)    the final product.

Each item is dealt with separately in this part of EN 12206 so that any interested party can ensure compliance appropriate to its area of responsibility.

CAUTION — The procedures described in this standard are intended to be carried out by suitably trained and/or supervised personnel. The substances and procedures used in this method may be injurious to health if adequate precautions are not taken. Attention is drawn in the text to specific hazards. This standard refers only to technical suitability and does not absolve the user from statutory obligations relating to health and safety.