Chemie a potravinářství

Oblast zaměření: Hnojiva
Komise : CEN/TC 223 (Soil improvers and growing media)
Původce: CEN
K připomínkám do: 17.12.2018
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This document describes a method to determine the aerobic biological activity of growing media and soil improvers or constituents thereof by measuring the oxygen uptake rate (OUR). The oxygen uptake rate is an indicator of the extent to which biodegradable organic matter is being broken down within a specified time period. The method is not suitable for material with a content of particle sizes > 10 mm exceeding 20 %.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 17.12.2018
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This part of the EN 13523 series specifies the procedure for evaluating the degree of curing by assessing the resistance of a cured organic coating film, applied on a metallic substrate, to a specified organic solvent.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 17.12.2018
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This part of the EN 13523 series specifies two methods for determining the numerical evaluation of the adhesion of strippable films which have previously been applied to an organic coating on a metallic substrate.

Samples can be tested irrespective of whether the strippable film has been applied in the laboratory or on the production line.

NOTE          Method 1 is preferred for films with adhesive and method 2 for films without adhesive.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 17.12.2018
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This document specifies the panel design and describes the procedure for determining the resistance to outdoor exposure of an organic coating on a metallic substrate.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 17.12.2018
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The method specifies the gravimetric procedure for determining the non-volatile-matter content as a percentage by mass of the majority of thermally cured coil coatings and subsequently for determining the theoretical spreading rate. The method is not suitable for pure epoxy coil coatings.

Oblast zaměření: Chemická analýza
Komise : CEN/TC 347 (Methods for analysis of allergens)
Původce: CEN
K připomínkám do: 31.12.2018
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This document specifies a method for the simulation of accelerated wear and corrosion, to be used prior to the detection of nickel release from coated articles that come into direct and prolonged contact with the skin. According to the Commission Regulation (EC) No 1907/2006 (REACH) articles with a nickel outer coating and those which are inserted into pierced ears and other parts of the human body are excluded from the scope of this standard.

Oblast zaměření: Lepidla
Komise : CEN/TC 193 (Adhesives)
Původce: CEN
K připomínkám do: 31.12.2018
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This document specifies test methods for the evaluation of the mechanical properties for moisture curing, self-curing or water drying foams dispensed from single pressurized containers used as an insulating air sealant and adhesive for both building and non-building applications.

This document does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory requirements prior to use.

The following test methods are described:

—    Compression strength: This test method describes how to determine the compressive strength of a cured foam. It gives an indication of the foams resistance against area distributed pressure. The maximum endurable stress is determined.

—    Movement capability: This test method describes how to determine the movement capability of cured foam. The result gives an indication of the degree of flexibility of the cured foam.

—    Bonding strength: The method displays the measurement of the bonding power of a One Component (Foam) Adhesive, dispensed from a pressurized can, between two substrates with direct contact.

—    Tensile strength: This test method describes how to determine the maximum stress a cured foam can withstand while being stretched before breaking. The result gives an indication of the elasticity of the cured foam.

—    Shear strength: This method displays the behavior of a foam system towards shear forces. It shows the strength and the bonding power of the foam as the sandwich element between wooden plates. The test is conducted according to EN 12090.

Oblast zaměření: Lepidla
Komise : CEN/TC 193 (Adhesives)
Původce: CEN
K připomínkám do: 31.12.2018
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This document specifies test methods for the evaluation of the expansion properties for moisture curing, self-curing or water drying foams dispensed from single pressurized containers.

This document does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory requirements prior to use.

The following test methods are described:

—    Dimensional Stability: This test method describes how to determine the dimensional stability (shrinkage or expansion) of cured foam under typical and extreme conditions.

—    Curing Pressure: This method describes how to determine the generation of pressure during the curing process of an OCF.

—    Post Expansion: This method describes how to measure the expansion of a freshly dispensed liquid foam (froth) during the curing phase.

Oblast zaměření: Lepidla
Komise : CEN/TC 193 (Adhesives)
Původce: CEN
K připomínkám do: 31.12.2018
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This document specifies test methods for the evaluation of the yield characteristics properties for moisture curing, self-curing or water drying foams dispensed from single pressurized containers.

This document does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory requirements prior to use.

The following test methods are described:

—    determination of the apparent density of an OCF extruded in a joint and calculation of the theoretical foam volume (yield) in running meters of the whole can;

—    determination of the total foam volume for the whole OCF container;

—    determination of the real volume of cured foam, respecting eventual cavities inside the foam structure;

—    determination of the density of a cured OCF for identification purposes only.

Oblast zaměření: Lepidla
Komise : CEN/TC 193 (Adhesives)
Původce: CEN
K připomínkám do: 31.12.2018
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This document specifies test methods for the evaluation of the application properties for moisture curing, self-curing or water drying foams dispensed from single pressurized containers used as an insulating air sealant and adhesive for both building and non-building applications.

This document does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory requirements prior to use.

The following test methods are described:

—    Cutting time: This test method describes how to determine the hardening time of a freshly foamed OCF (froth) until it can be cut.

—    Tack free time: This test method describes how to determine the tack free time of a freshly foamed OCF.

—    Sagging behaviour: This test method describes how to evaluate the sagging behaviour and determine the biggest joint possible before a liquid OCF (froth) slips off.

Oblast zaměření: Lepidla
Komise : CEN/TC 193 (Adhesives)
Původce: CEN
K připomínkám do: 31.12.2018
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This document specifies test methods for the evaluation of the insulation properties for moisture curing, self-curing or water drying foams dispensed from single pressurized containers used as an insulating air sealant and adhesive for both building and non-building applications.

This document does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory requirements prior to use.

The following test method is described:

—    Thermal conductivity: This method describes how to determine the long term thermal conductivity of a cured OCF foam, dispensed from a pressurized can, with a sample subjected to accelerated ageing procedure.

Oblast zaměření: Lepidla
Komise : CEN/TC 193 (Adhesives)
Původce: CEN
K připomínkám do: 31.12.2018
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This document specifies a method for testing the strength of wood adhesives at 80 °C.

NOTE          The procedure described is based on a test developed in Germany known originally as the WATT '91 test. It uses the test piece described in EN 205.

Oblast zaměření: Lepidla
Komise : CEN/TC 193 (Adhesives)
Původce: CEN
K připomínkám do: 31.12.2018
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This document specifies test methods for the determination of the suitability of two component epoxy and two component polyurethane adhesives for glued-in steel rods in glued laminated timber (GLT) and glued solid timber (GST) according to EN 14080, cross laminated timber (CLT) according to EN 16351 and laminated veneer lumber (LVL) according to EN 14374.

It specifies performance requirements and the determination of characteristic bond strength values for such adhesives for the prefabrication under factory or factory-like conditions of load-bearing timber-steel rod joints only. This document does not cover the performance of adhesives for on-site gluing (except for factory-like conditions).

Several provisions of this document can apply to repair and upgrading of existing timber structures including (cracked/fissured) solid wood beams. For adhesives for on-site repair or applications with solid timber additional provisions need to be taken into account. Such provisions are not part of this document.

This document also covers glued–in rods in surface treated wood. It does not cover glued-in rods in 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 joints are intended for load-bearing timber structures subjected to temperatures up to 60 °C over a longer time in service classes 1 and 2 which are loaded predominantly static or quasi static according to EN 1990 and EN 1991-1-1.

A design procedure for glued-in rods for timber structures is given in an informative Annex A.