Chemie a potravinářství

Oblast zaměření: Laboratorní sklo
Komise : CEN/TC 332 (Laboratory equipment)
Původce: CEN
K připomínkám do: 14.05.2018
Zobraz více Zobraz méně
 

This document applies to Recirculatory Filtration Fume Cupboards (RFFC).

Recirculation Filtration Fume Cupboards are devices intended to protect their users by means of:

—    the ability to contain potentially hazardous materials;

—    the ability to remove potentially hazardous materials from air exhausted from within the fume cupboard by means of filtration before the air is recirculated (to the room in which the fume cupboard is located).

This document includes design and manufacturing requirements together with type testing procedures.

Oblast zaměření: Lepidla
Komise : CEN/TC 193 (Adhesives)
Původce: CEN
K připomínkám do: 14.05.2018
Zobraz více Zobraz méně
 

This document specifies a test method for determining the comparative compression shear strength of adhesive bonds and solid wood at both ambient temperature and elevated temperature. The maximum load of the test pieces at ambient temperature and after exposure to a defined elevated temperature for a specified duration of time is evaluated. It is applicable to adhesives used in load bearing timber structures and to other wood adhesives.

It is suitable for assessing the influence of elevated temperatures on the compression shear strength of the adhesive bond.

This method is intended primarily to obtain performance data for the influence of elevated temperatures on the behaviour of adhesive bonds. It can be used for the assessment of adhesives for load bearing timber structures and as well for the assessment of non load-bearing wood adhesives with respect to their suitability for forming bonds in defined climatic environments, at elevated temperatures.

This method is not intended to provide data for structural design, and does not necessarily represent the performance of the bonded member in service.

Oblast zaměření: Hnojiva
Komise : CEN/TC 260 (Fertilizers and liming materials)
Původce: CEN
K připomínkám do: 21.05.2018
Zobraz více Zobraz méně
 

This document specifies a method for the determination of traces of perchlorate in mineral fertilizers by ion chromatography and conductivity detection (IC-CD).

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 26.05.2018
Zobraz více Zobraz méně
 

This part of ISO 8130 specifies a visual method to determine the deterioration of surface quality of the final coating when mixing two different coating powders. The surface quality will depend on the following characteristics of the coating powders:

a)    the chemical reactivity;

b)   the chemical composition;

c)    the melt properties.

The onset of the incompatibility in appearance, its nature and its extent will depend greatly on the ratio in which the powders are mixed. The nature of the incompatibility in surface appearance may manifest itself in various ways, described in Clause 8.

This test is useful in predicting the possibility of incompatibility arising from mixing different powders both during the manufacturing process and during the application of the coating powder.

This part of ISO 8130 concerns only changes in visual aspects of the coating. The mixture series can also be used for testing properties such as mechanical properties, chemical properties, corrosive properties and resistance against UV radiation. Further properties can be agreed between interested parties.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 26.05.2018
Zobraz více Zobraz méně
 

This part of ISO 8130 specifies a method for the determination of the particle size of coating powders by sieve analysis. Particle size distributions with a maximum of less than 100 µm should be determined by laser diffraction (see ISO 8130‑13). This method is used especially for determining the oversize material or for the presence of contamination and may be used as a quality control procedure (“go”/“no go” test) by checking the amount of powder retained on a single sieve.

The following particle sizes are typical for coating powders, however the particle size can deviate depending on the application:

—    thin-film technology:          1 µm to 63 µm

—    electrostatic coating:          10 µm to 200 µm

—    fluidizing-bed method:       100 µm and above

NOTE          Sieves with a mesh size smaller than 32 µm are not practical and are likely to become blind during use.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 26.05.2018
Zobraz více Zobraz méně
 

This part of ISO 8130 specifies a comparative method for determining the flow characteristic of a fused thermosetting coating powder down a plane inclined at a set angle to the horizontal.

The aim of the test method described in this Part of IS0 8130 gives an indication of the degree of melt flow that may occur during the curing of the coating powder. This characteristic contributes to the surface appearance and to the degree of coverage over sharp edges.

The test is a comparative method for checking for batch to batch variation in the behaviour of a given coating powder. Correlation between the results from coating powders of differing composition is not to be expected.

This method is not suitable for coating powders which have gel times of less than one minute at the test temperature when characterised according to ISO 8130‑6. This method is also not suitable for textured powders.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 26.05.2018
Zobraz více Zobraz méně
 

This part of ISO 8130 specifies a method for the determination of loss of mass on stoving of coating powders that are to be applied by electrostatic spraying or flock spraying or fluidized bed.

The method described in this part of ISO 8130 is a simple, practical test which provides sufficiently accurate results for coating powders that lose approximately 2 % (by mass) on stoving (heating). Above this, accuracy decreases with an increasing loss in mass.

This method determines all volatile matter including water.

Thermogravimetric testing as described in ISO 11358[1] may be used as a comparative method.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 26.05.2018
Zobraz více Zobraz méně
 

This part of ISO 8130 specifies a method for the determination of the equivalent-sphere particle size distribution of coating powders by laser diffraction, for particles of the size range from 1 µm to 300 µm.

NOTE          Particle sizes > 300 µm may well require the use of a different optical model.

This document is specific for the measurement of coating powders and also engages ISO 13320, which provides guidance on instrument qualification and particle size distribution.

Laser diffraction is not suitable for determining oversize material, which can be verified by sieve analysis as specified in ISO 8130‑1 or by dynamic image analysis as specified in ISO 13322‑2.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 26.05.2018
Zobraz více Zobraz méně
 

This part of ISO 8130 defines special terms used in the field of coating powders.

Other terms and definitions related to paints and varnishes are given in ISO 4618.[1]

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 5.06.2018
Zobraz více Zobraz méně
 

This document specifies a general method for determining the average molecular weight and the molecular weight distribution of polymers using SEC-LS, i.e. size-exclusion chromatography coupled with light-scattering detection. The average molecular mass and the molecular mass distribution are calculated from molecular weight data and weight concentrations determined continuously with elution time. The molecular weight at each elution time is determined absolutely by combining a light-scattering detector with a concentration-sensitive detector. Therefore, SEC-LS is classified as an absolute method.

For the applicability of the method, see ISO 16014‑1:—, Clause A.1.