Kemesta

This document specifies three test methods for the determination of the tear strength of vulcanized or thermoplastic rubber, namely the following: The value of tear strength obtained depends on the shape of the test piece, speed of stretching, and temperature of test. It can also be susceptible to grain effects in rubber. Method A: Using a trouser test piece Method A, using the trouser test piece, is preferred because it is not sensitive to the length of the cut, unlike the other two test pieces in which the nick has to be very closely controlled. In addition, the results obtained are more easily related to the fundamental tear properties of the material and are less sensitive to modulus effects (provided that the leg extension is negligible) and the rate of propagation of the tear is directly related to the rate of grip separation. With some rubbers, the propagation of tear is not smooth (knotty tear), and analysis of results can be difficult.[3] Method B, procedure (a): Using an angle test piece without nick This test is a combination of tear initiation and propagation. Stress is built up at the point of the angle until it is sufficient to initiate a tear and then further stresses propagate this tear. However, it is only possible to measure the overall force required to rupture the test piece, and, therefore, the force cannot be resolved in two components producing initiation and propagation.[4] Method B, procedure (b): Using an angle test piece with nick This test measures the force required to propagate a nick already produced in the test piece. The rate of propagation is not directly related to the jaw speed.[5] Method C: Using a crescent test piece This test also measures the force required to propagate a nick already produced in the test piece, and the rate of propagation is not related to the jaw speed.

This document specifies performance requirements and test methods under prescribed laboratory conditions for the evaluation of pumped samplers used in conjunction with an air sampling pump and of procedures using these samplers for the determination of semi-volatile chemical agent in workplace atmospheres. The procedures given in this document provide results only for the sum of airborne particles and vapour. The concentration is calculated in terms of mass per unit volume. This document is applicable to pumped samplers and measuring procedures using these samplers in which sampling and analysis are carried out in separate stages.

This document specifies requirements for biobanking of bacteria and archaea including acquisition, microbial culture, identification, quality control, preservation, storage, and distribution. It includes management of microbial material associated data as well as biosafety and biosecurity requirements. This document is applicable to all organizations performing biobanking of bacteria and archaea used for research and development. This document does not apply to processing methods for microbial materials intended for food/feed production, laboratories undertaking food/feed analysis, or therapeutic use.

This method describes procedures for the determination of lignin content in kraft, soda, and hydrolysis lignin. The method is applicable to lignin isolated from a kraft pulping process, a soda pulping process, or lignin obtained by hydrolysis of biomass.

This document addresses performance criteria for coating systems on exterior wood. Performance requirements are specified according to three categories of end use (defined in EN 927 1) in terms of two mandatory tests, namely natural weathering performance testing carried out in accordance with EN 927 3, and water permeability in accordance with EN 927 5. Additional optional tests (non-mandatory) are tabled which can be used by suppliers, or for specification purposes, to provide additional information, to a standardized format, on aspects of performance relevant to specific situations. The majority of test methods are drawn from EN 927 (all parts), but where relevant additional tests from other national and international sources are used.Requirements for claiming conformity with this document are defined and provide flexibility for different situations and can also provide a basis for certification.

This document specifies a method for the determination of the high-speed mechanical stability of synthetic rubber latex. The method is not applicable to natural rubber latices.

This document describes the typical immersion method for acid pickling generally used in shop facility’s for the preparation of steel substrates before application of paints and related products. It is in general applicable to new steelwork. This method is essentially intended to remove rust and mill scale. Only slight oil residues will be removed during this process. It could be used on steel surfaces that are easily deformed by abrasive blasting.

This document specifies establishment, expansion, preservation, maintenance, characterization, quality control, storage, distribution and transport requirements for the biobanking of mouse and human pluripotent stem cells. This document is applicable to all organizations performing biobanking with mouse and human pluripotent stem cells used for research and development. This document does not apply to cell lines used for in vivo application in humans, clinical applications or therapeutic use.

This document specifies the terms and definitions, basic requirements, technical requirements, test methods, test regulations, and packaging of industrial compostable drinking straws.

This document specifies the terms and definitions, requirements, test methods, test regulations and packaging, transportation and storage of biodegradable plastic shopping bags for industrial composting. This document is applicable to plastic shopping bags made from biodegradable plastic resin as the main raw material, processed by heat sealing or bonding, etc. It is also suitable for shopping bags made of composite of biodegradable plastic and other materials. This document does not apply to such biodegradable plastic bags as biodegradable roll bags (also known as tear bags or point break bags made from the above materials) that are only used in packaging and are not used for carrying shopping.

This part of prEN 1335:2017 applies to office work chairs. It specifies dimensions of three types of chairs as well as test methods for their determination.Annex A (informative) contains a Rationale for office chair features and comparison between current published dimensions with European anthropometric data.

This document specifies requirements for the safety, strength and durability of all types of non-domestic tables including those with glass in their construction.It does not apply to office work tables or desks, tables for educational institutions, laboratory workbenches for educational institutions and outdoor tables for which EN standards exist.It does not apply to laboratory workbenches for professional use and industrial workbenches.With exception of the stability tests, this document does not provide assessment of the suitability of any storage features included in non-domestic tables.It does not include requirements for electrical safety.It does not include requirements for the resistance to ageing, degradation.This document has three annexes:— Annex A (normative) Test methods for finger entrapment;— Annex B (informative) Additional test requirements;— Annex C (informative) Test severity in relation to application.

This document specifies requirements for the collection, isolation, culture, expansion, characterization, quality control, cryopreservation, storage, distribution and transport of human mesenchymal stromal cells derived from bone marrow (hBM-MSCs) for biobanking. This document is applicable to all organizations performing biobanking with hBM-MSCs used for research. This document does not apply to hBM-MSCs for the purpose of in vivo application in humans, cell therapy, clinical applications, tissue engineering or therapeutic use.

This document specifies a method for determining the shear strength of adhesive bonds in close contact glue line and thick glue line.It is suitable for the following applications:a) for assessing the compliance of adhesives with EN 301, EN 15425, EN 16254, EN 17334 and EN 17418;b) for assessing the suitability and quality of adhesives for load-bearing timber structures.This test is intended primarily to obtain performance data for the classification of adhesives for load-bearing timber structures according to their suitability for use in defined climatic environments.This method is not intended for use to provide for structural design and does not necessarily represent the performance of the bonded member in service.

This document specifies a method for determining the resistance to delamination in glue lines.It is suitable for the following applications:a) for assessing the compliance of adhesives with EN 301, EN 15425, EN 16254, EN 17334 and EN 17418;b) for assessing the suitability and quality of adhesives for load-bearing timber structures;c) for comparing the effects on the bond strength resulting from the choice of bonding conditions, from different climatic conditioning and from the treatment of the test pieces before and after bonding.This test is not applicable for modified and stabilized wood with strongly reduced swelling and shrinkage properties, such as acetylated wood, heat-treated wood and polymer impregnated wood.This test is intended primarily to obtain performance data for the classification of adhesives for load-bearing timber structures according to their suitability for use in defined climatic environments.This method is not intended to provide data for structural design and does not necessarily represent the performance of the bonded member in service.

This document specifies a method for determining the influence of shear strength in crosswise gluing by wood shrinkage under drying conditions.It is suitable for the following applications:a) for assessing the compliance of adhesives with EN 301, EN 15425, EN 16254, EN 17334 and EN 17418;b) for assessing the suitability and quality of adhesives for load-bearing timber structures;c) for determining if the adhesive is capable of withstanding stresses due to wood shrinkage without unacceptable loss of strength.This test is intended primarily to obtain performance data for the classification of adhesives for load-bearing timber structures according to their suitability for use in defined climatic environments. This test is carried out on Norway spruce (Picea abies L.).This method is not intended for use to provide numerical design data and does not necessarily represent the performance of the bonded member in service.

This document specifies a laboratory method of determining the maximum assembly time at two spread rate levels in standard atmosphere [20/65].This document is intended for obtaining a reliable base of comparison of the maximum assembly time between adhesives at referenced conditions.

This document specifies a method of determining the minimum pressing time for two glue line thicknesses, close contact glue line and 0,3 mm thick glue line (for gap filling adhesive 1,0 mm), at three temperatures. It is applicable to adhesives used in load- bearing timber structures.This document is only intended for obtaining a reliable base of comparison of pressing time between adhesives. The method gives results that cannot be applied to the safe manufacture of timber structures without modifications for the influences of timber density/absorbency, moisture content, factory temperature and relative air humidity.

This document specifies a method for determining the working life for adhesives mixed with hardener for load-bearing timber structures, by a viscosity test.This method is not suitable for determining the working life of a multi-component adhesive whose actual working life is very short.This document is only intended for obtaining a reliable basis for comparison between adhesives. The method gives results which cannot be applied to the safe manufacture of timber structures without modifications for the influences of factory temperature and relative air humidity.