Do hoses have to have a CE marking? When may a hose be used for transporting food? Which regulations apply in Europe and which in the USA? Answers to these and more questions can be found here.
Are you looking for technical information? Here you will find information on all technical aspects of our hoses and connection solutions - as well as standards and regulations, instructions, electrostatics notes, a chemical resistance list and the Technical Appendix.
The Technical Rule for Hazardous Substances - TRGS 727 for short - has been valid since 26.04.2016 for the assessment and avoidance of ignition hazards due to electrostatic charges in potentially explosive atmospheres as well as for the selection and implementation of protective measures to avoid these hazards.
It has replaced and updates the previous TRBS 2153. With TRGS 727, there have been changes in the measurement procedures for technical hoses in potentially explosive atmospheres. We have been following this development for a long time and are therefore also familiar with the new measuring methods.
A distinction is now made between pneumatic and aspirative conveying. Surface or leakage resistance remains the definitive unit for determining the area of application in aspirative conveying. From now on, resistivity will be the definitive unit for determining the area of application in pneumatic conveying.
Important: Our electrically conductive and antistatic hoses can still be used without hesitation!
They comply with the new standards of TRGS 727, and their suitability can be verified with appropriate certificates. From a technical point of view, therefore, nothing has changed with regard to the products you are used to.
During the transport of solid, liquid or gaseous media, a so-called "interfacial potential" is built up due to friction on the inner wall of hose lines, for example. Depending on the degree of charging, this leads to sparking, electrical breakdown or, under certain circumstances, to the ignition of ignitable substances. In addition to the intensity of contact (friction) between the medium and the hose wall, the "dielectric constant" of the hose and flow medium is decisive for the level of chargeability. This is regarded as a measure of the polarizability. Even conductive substances become charged if they are not grounded.
A number of guidelines and regulations exist for the assessment and avoidance of ignition hazards and the protective measures to be taken. At this point, we refer primarily to the Technical Rule for Industrial Safety, TRGS 727 "Avoidance of ignition hazards due to electrostatic charges", which is determined by the Committee for Industrial Safety (ABS) and published by the Federal Ministry of Labor and Social Affairs in the Joint Ministerial Gazette. TRGS 727 replaces and updates the previous TRBS 2153.
Masterflex products also comply with the relevant Union harmonization legislation: Directive 94/9/EC (until April 19, 2016) and Directive 2014/34/EU (from April 20, 2016).
The surface resistance of hose wall materials can be reduced to values between 103 and 104 ohms by incorporating conductive additives. These conductive additives (e.g. conductive carbon black) form a network of contacting conductive particles in the plastic (volume conductivity). However, due to the additives, these plastics are aus-
timately available in black.
Another possibility is the incorporation of antistatic additives, whereby a surface resistance of <109 ohms is achieved and the transparency of the base materials is maintained. There are antistatic additives that achieve a corresponding surface resistance by binding the moisture in the air to the hose surface. However, this embodiment has the disadvantage that when dry powders, for example, are conveyed, poor or insufficient antistatic properties result from the lack of air moisture. In addition, the buildup of suitable surface resistance can be impeded by the abrasion that occurs during use
. For this reason, antistatic hoses should be used in the zones/applications permitted for this purpose, preferably equipped with permanently effective antistatic additives that do not depend on an additional external component.
For subordinate applications, such as in Zone 1 for "gases and liquids with low conductivity" and in Zone 21 for "non-flammable dusts/bulk materials", spiral/clip hoses with discharge of electrostatic charges can also be used on Masterflex hoses with a wall material where there is a surface resistance > 109 Ohm. In this case, however, care must be taken to ensure a spiral/clip pitch < 30 mm and an overlap of the spiral < 2 mm in order to be able to achieve a dissipative effect.
In all the applications described above, both spiral/clip ends of the hose must always be connected to the connector in a conductive manner. Information on the possible applications of Masterflex hoses is given in the relevant catalog data sheets under Properties.
Limits and definitions
Electrostatic chargeable are generally:
Electrostatic chargeable are generally:
In practice, this means with regard to
uses of hose assemblies with
wire helix/clip:
1. when handling "low conductivity gases and liquids" in Zone 1, and "non-flammable dusts/bulk solids" in Zone 21, spiral/clip hoses can be used whose wall surface resistance is >109 ohms, the spiral/clip pitch is <30 mm, and the spiral/clip overlap is <2 mm. In addition, when installing the hoses, make sure that both
spiral/clip ends are grounded to the dissipative connection parts.
2 Increased protection is achieved when using non-rechargeable hoses, e.g. antistatic hoses with a surface resistance <109 Ohm, where the exposed spiral/clip ends are also connected to earth with the conductive
connection parts.
3. electrically conductive hoses with a surface resistance <106 Ohm offer optimum safety. For safety reasons, these hoses should also have a grounding connection between the exposed wire ends and the conductive connection pieces. Tested Masterflex hoses with the suffix "EL" fully meet these requirements.
The determination of the surface resistance depends on the respective measuring method and, in the case of non-conductive solids, is carried out in accordance with DIN IEC 60093 / VDE 0303, Part 30 (Test methods for electrical insulating materials, volume resistivity and surface resistivity of solid, electrically insulating materials).
For rubber and plastic hoses and hose assemblies, DIN EN ISO 8031 - Rubber and plastic hoses and hose assemblies, describes the determination of electrical resistance.
This standard describes:
The addition of conductivity additives or antistatic agents reduces the mechanical properties of the material (e.g. abrasion and tear resistance) and thus shortens the service life. The information is based on internal and external field tests
as well as the currently valid regulations. It serves as a guideline for the use of Masterflex hose types in potentially hazardous areas and does not claim to be complete.
The catalog information regarding surface resistance is based in part on official test results, information from our raw material suppliers
and internal measurements. In case of doubt, we recommend that users test hoses under operating conditions or similar conditions before final installation.
REACH stands for Registration, Evaluation, Authorization and Restriction of Chemicals. REACH is a European Union regulation that was enacted to improve the protection of human health and the environment from the risks that can be posed by chemicals, while at the same time increasing the competitiveness of the EU chemical industry.
In principle, REACH applies to all chemical substances used in industrial processes. The REACH system is based on the principle of industry ownership. Within the scope of application, only chemical substances that have been registered beforehand may be placed on the market.
Masterflex SE is aware of the requirements of the REACH regulation in principle and fulfills its obligations to implement REACH in accordance with the law. We have initiated communication with our upstream suppliers and, as a distributor rather than a manufacturer, are dependent on their information. Our suppliers have confirmed to us that they have pre-registered or intend to register their substances. Should substances fall under the REACH exemption, we will be informed immediately.
Masterflex SE hereby declares on the basis of the available supplier data that the distributed products meet the requirements of the REACH Regulation (EC) No. 1907/2006.
About the declaration of conformity to the REACH regulation
The CE marking (Conformité Européenne) means "conformity with EU directives" and is a marking under EU law for certain products related to product safety.
By affixing the CE marking, a manufacturer confirms that its product complies with one or more applicable European directives within whose scope the product falls in each case. This is now mandatory for certain product groups.
CE-marked products are subject to the unrestricted movement of goods in any EU country, while products requiring marking may no longer enter the movement of goods after a certain specified date (example: the date for machines is 01.01.1995).
In general, Masterflex SE hoses do not fall under product groups subject to mandatory labeling, since according to the definition of the EU Machinery Directive 89/392/EEC, hoses are neither classified under machinery, safety components or products according to the Low Voltage and EMC Directives, the Medical Device Directive, etc., but are considered components that do not qualify for CE labeling.
Therefore, hoses must not be marked and corresponding declarations of conformity (manufacturer's declarations) must also not be issued by Masterflex SE. Safety data sheets according to DIN EN 292 and works certificates according to EN 10204, which certify the properties of Masterflex products, can be provided if required.
All information provided by us is general information which, due to individual application possibilities, different on-site operating conditions and design variation possibilities, does not permit any commitment or guarantee.
In order to be allowed to use hoses in the food sector, they must meet the corresponding "food regulations or approvals". The polyurethane hose types produced by Masterflex meet these requirements.
The raw materials used to manufacture Master-PUR Food hoses comply with the following food law conditions:
The raw materials used for the production of Master-PUR Food A hoses comply with the following food law conditions:
In order to be allowed to use hoses in the food sector, they must meet the corresponding "food regulations or approvals". The polyurethane hose types produced by Masterflex meet these requirements.
The raw materials used to manufacture Master-PUR Food hoses comply with the following food law conditions:
The raw materials used for the production of Master-PUR Food A tubing comply with the following food regulations:
DIN EN ISO 8031
Rubber and plastic hoses and hose assemblies
DIN 54345-1
Testing of textiles
DIN ISO 4649
DIN 53752
Requirements for spiral hoses made of TPU
DIN 53752
Testing of plastics
DIN 53505
Testing of rubber and elastomers
DIN 53359
Testing of artificial leather and similar fabrics
DIN 53863-2
Testing of textiles
DIN ISO 34-1
Elastomers or thermoplastic elastomers
DIN 53504
Testing of rubber and elastomers
DIN EN ISO 1183-1
Plastics
All data are the result of internal tests and trials in accordance with international standard recommendations and refer to a medium and ambient temperature of +20 °C. Deviating temperatures can change the pressure and vacuum data. Due to the design, a change in length of individual hose types is possible due to the influencing variables of pressure, vacuum, medium and ambient temperature.
The operating pressure, the test pressure and the burst pressure are determined in accordance with DIN EN ISO 7751.
In the vacuum strength test, the hoses are laid in a 90-degree bend while maintaining the minimum bending radius and subjected to negative pressure until they showed signs of indentation or collapse. Taking into account a generally accepted safety factor, the determination of the permissible negative pressure in continuous operation is carried out.
The determination of the negative pressure specifications for Masterflex hoses is based on DIN 20024, item 15.
The pressure drop is the air resistance in a hose or pipe system.
When designing a ventilation system, the unavoidable air resistance must be taken into account. To simplify the determination of pressure loss, the specific pressure losses of Masterflex hoses can be taken from diagrams.
The data are mean values for hoses in the stretched condition at +20 °C.
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