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Product Quality
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NORRES pursues a successful sustainability strategy which, amongst other things, specifies the following basic principles for product development:

  • Bio-based sources of raw materials that are not in competition with food production
  • “bioplastics” derived from renewable raw materials boasting comparable properties to conventional plastics
  • Raw materials with a low environmental impact based on the life cycle assessment (LCA) [= ecobalance]
  • Focus on bioplastic monomers derived from renewable raw materials for polyesters, polyamides, polyurethanes and vinyl polymers

These specifications have firstly resulted in the development of bioplastics based, for example, on derivatives of castor oil. Their share is usually in the region of 20 to 50%, depending on the hardness and the nature of the synthetic material. The mechanical properties and chemical resistances of bioplastic raw materials are not significantly different from those of our standard types. The approvals for the “bioplastic” products which are available as an option may deviate from those of the standard types.

Secondly, plastics and products with a relatively low environmental impact according to the life cycle assessment (LCA) [= ecobalance] have meanwhile been developed and released for productive use.

All NORRES products identified with this icon are either manufactured from a bioplastic raw material as standard, or available in a bioplastic version as an option, or they have a comparatively good ecobalance.

  

Pre-PUR®

Polyurethanes are not all the same! For many of its hoses, NORRES uses special ester-polyurethane and ether-polyurethane mixtures that we distinguish with the name Pre-PUR®. Compared to many other plastics, rubber formulations and “simple” polyurethanes, the block copolymers, which consist of hard and soft Pre-PUR® segments, have superior properties.

Our hoses made from Pre-PUR® raw materials differ as follows from many of the hoses commercially available:

detailed description of Pre-PUR®

HT-PUR

Continuous operating temperatures of 125°C are often demanded of the hoses used in plastics production or on printing presses and compressors. NORRES has developed a new polyurethane type based on the premium polyurethane Pre-PUR® that is more resistant to heat and less susceptible to ageing than other materials.

The polymer is cross linked by NORRES in an innovative process to create a material that shows a 40 percent improvement in mechanical stability during heat exposure. NORRES hoses with the HT-PUR symbol can be heated to a continuous operating temperature of 125°C and withstand peaks of up to 150°C.

Advantages of HT-PUR hoses at a glance:

Abrasion-resistant

The particularly high quality mixtures of PUR materials, as well as the optimized, reinforced hose designs from NORRES, result in substantially less wear in pumping and transport processes than with many other hoses. These NORRES hoses are specially developed for long service life for the delivery of highly abrasive media. Compared with similar grades of hose, they are distinguished by a number of special characteristics, including:

Crush-Proof

NORRES hoses with this symbol are specially designed for workshop use and laying on floors. They are able to resist crushing to some extent or entirely when driven over or stepped on. Please refer to the relevant product description for more details.



Interior smoothness

Many hoses from NORRES have outstanding interior smoothness and are thus optimized for flow. They have the following advantages:
  • Very high delivery rates
  • Low pressure loss
    → reduction of blower power requirements
    → lower operating costs
  • Gentler material delivery
  • Low wear and therefore longer service life

High flexibility

This symbol is only used for NORRES hoses that are highly flexible and have the following characteristics:

Ether-PUR

For many hoses, NORRES uses a special, high quality ether-polyurethane instead of the ester-polyurethane frequently used for commercial applications. Hoses of this type have the following advantages:

Approvals for use with foodstuffs

NORRES hoses with this symbol have one or more national and/or international approvals and certifications of conformity that allow them to be used in food applications. Please refer to the relevant product description for more details.



Flame retardant

NORRES hoses with this designation have one or more national and/or international approvals classifying them as having low flammability or as self-extinguishing and/or fall below specified rates of burning.



Partially coloured

Strengthen your market position by consistent application of your corporate design and differentiate yourself from the competition. Create a unique “look” to secure after-sales business and reduce product liability risks with an unfalsifiable appearance.

Using a patented production method, AIRDUC® and PROTAPE® hoses can also be coloured in the bead area according to your specifications. Compared with completely coloured hoses, the partially coloured design makes the impression of a significantly more flexible, lighter product. Moreover, as with transparent hoses, it is possible to observe processes directly. Please note the dedicated subsection.

PVC-free

Hoses with a PVC content, which could not easily and immediately be recognized (such as polyurethane hoses with PVC-coated wires), are also offered on the market.
Increasingly, PVC is becoming undesirable for the following reasons:
NORRES hoses with this symbol are 100% PVC-free.

Electro-Static Discharge

When pumping solid materials and fluids through tube and hoses that can store charge, friction between the material conveyed and the wall as well as friction within the medium can cause a build-up of electrostatic charge (=charge separation). AIRDUC®, PROTAPE® (except PROTAPE® MEMORY) and BARDUC hoses from NORRES have a steel wire embedded in the hose wall that enables it to be discharged and provides the following advantages: Please refer to the relevant product description for more details and the technical appendix.

Antistatic or electrically conductive hoses

According to the new ATEX guideline and the German BGR 132, electrically conductive hoses should be used in areas where the danger of explosion exists. Products of this type are distinguished by a special symbol.

Please refer to the relevant product description for more details and the technical appendix.


Special wire adhesion

Many hose types are designed with the spring steel wire firmly embedded in the wall. This strong adhesion is a key prerequisite of the product’s stability, resistance to overpressure and axial stiffness, which in turn have an important influence on hose service life. The operating conditions, for example oils or solvents diffusing into the wall, a combination of mechanical and dynamic loads and especially high or low temperatures, frequently represent a formidable obstacle to achieving permanent adhesion between the spring steel wire and the wall.

Our longstanding experience has taught us that detached wires provoke increased and asymmetric rippling of the hose, usually resulting in a significantly shorter service life, substantially higher pressure losses and long-term disruptions to the delivery process.

Hoses manufactured using our special, highly advanced, multistage adhesion process are marked with this symbol. The exceptionally long service life realised with these products – even when subjected to severe combined loads – would otherwise remain unattainable.

Permanently antistatic

In the past, hoses with antistatic properties were generally manufactured using an additive that migrated over time, so that the material’s antistaticness was gradually lost. The desired antistatic properties could often only be guaranteed if the ambient air was sufficiently humid.

Thanks to a novel, innovative material from NORRES, all hoses marked with this symbol are permanently antistatic. Their antistatic properties are not dependent on the relative humidity nor does their effect deteriorate due to migration.

RoHS

NORRES products bearing this mark comply with the EU Directive 2002/95/EC banning the use of certain substances in the manufacture or processing of electrical and electronic equipment and components. The objective of NORRES is to exclude the use of particularly problematic material components in the products in question. Amongst other things, this entails lead-free soldering of electronic components, withdraw of toxic fl ame retardants in the manufacture of cables and cable protection devices and the introduction of suitable substitute products.

The following substances are not contained in the abovementioned NORRES equipment according to the directive: The revised Appendix to the Directive specifi es maximum concentrations for the materials contained in a product. The permitted concentrations are 0.01% by weight for cadmium and 0.1% by weight for the other fi ve substances. Brass and copper alloys must not contain more than 4% lead by weight.

The acronym RoHS means “Restriction of the use of certain hazardous substances in electrical and electronic equipment”. A transitional period for manufacturers and industries affected by this Directive was effective until July 1, 2006.

UL

NORRES products with UL test marks and certifications support access to the world’s major sales markets. Such marked NORRES products guarantees maximum quality and integrity, and throughout North America the UL Mark is recognized as the number one quality mark for safety. As well in South America, Europe, the Middle East, Africa, the Asia- Pacific region and Australia this mark is very widespread.

UR

NORRES products with the “Recognized Component Mark” have been tested by UL. We use this mark for component parts that are part of a larger product or system. This test mark is probably the most widely accepted form of certification amongst consumers, regulatory authorities and insurance companies in the USA and Canada.

CSA

NORRES products bearing the CSA Certification Mark have been tested and certified to meet applicable standards for safety or performance. These standards include those of UL (Underwriters Laboratories), ANSI (American National Standards Institute) and NSF (National Sanitation Foundation). The CSA Certification Mark appears on more than a billion products worldwide. This mark on electronic and electrical products is recognised throughout the USA and Canada.

VDE

The VDE Mark issued by the VDE Testing and Certification Institute indicates a product‘s conformity with the VDE standards or European or internationally harmonised standards and confirms its compliance with the protective requirements of the applicable EC Directives. Regular factory inspections and product surveillance are an integral part of granting and holding the relevant VDE Mark, which guarantees a uniform and constant product quality. The international recognition of the VDE Mark opens and ensures easy entry to many national and global markets.

EU Food approval

Polyurethane hoses of the NORRES PUR MHF series, which are made from special, particularly high-quality raw materials, are perfectly suited for many applications in the food sector. Furthermore, there is an official approval for the entire hose in each case by an independent testing laboratory in accordance with the new EU Directive 2002/72/EC, incl. the latest amendment 2007/19/EC. We therefore have the right to label these hose types with the official food logo of the EU, the “glass/fork” symbol. These hoses can be recognized by the symbol on the data sheets.

Silicone free

Silicone can have a particularly adverse effect on paint compatibility. In car body shops, for example, even the slightest contamination can lead to serious defects on the paintwork surface. The raw material formulations used to make the materials for NORRES products bearing this mark contain no silicone. In addition, no substances containing silicone are used in the NORRES production process.

Halogen free

The halogens are a series of chemical compounds including chlorine, bromine and iodine. Halogens are contained in certain plastics and above all in many flame retardants. These substances are particularly undesirable in combustion processes, where they represent a potential health hazard. The raw material formulations used to make the materials for NORRES products bearing this mark contain no halogens.

Cadmium free

Cadmium compounds used to be contained in many plastics as light-fast pigments or stabilisers. However, since cadmium is also a highly toxic heavy metal that can pollute the environment as a result of migration or refuse incineration, its use is often limited today. The raw material formulations used to make the materials for NORRES products bearing this mark contain no cadmium.

EMC

NORRES products bearing this mark incorporate a particularly high degree of shielding. EMC is the globally accepted acronym for “Electromagnetic Compatibility”. We would be pleased to provide you with detailed information or personal consulting about the various products marked in this way.





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