Ensinger plastics are used as the raw material for a wide range of high-quality components and end products in felds such as the food industry and medical technology, as well as mechanical and automotive engineering, semi-conductor technology and in the aerospace industry. To maintain the high standard of quality and functionality in our materials for these applications also over extended storage periods, certain factors must be taken into consideration in the storage, treatment and handling of Ensinger semi-fnished products. By taking these precautions, it is possible to ensure that external inﬂuences are unable to signifcantly diminish the material properties. In the case of fnished
parts, the individual manufacturer or user is required to submit an individual confrmation of this, as conditions can diﬀer considerably depending on the storage or utilization period.
1. Storage and handling should take place in such a way that the material designations and product numbers (batch number) are clearly recognizable on the semi-fnished products and can be maintained. This allows clear identifcation and traceability of products in the event of a possible
complaint, allowing the possible root cause of the problem to be determined.
2. Weathering eﬀects can impact on the properties of plastics. As result of the impact of solar radiation (UV radiation), atmospheric oxygen and moisture (precipitation, humidity) can exert a lasting negative impact on material characteristics. These influences can result in colour changes, oxidation of surfaces, swelling, warping, brittleness or even a change in mechanical properties. For this reason, semi-fnished products should not be exposed to direct sunlight or the eﬀects of weather over protracted periods. If possible, the semi-fnished products should be stored in closed rooms under normal climatic conditions (23 °C /50 %rH).
The following materials in particular should be protected against the inﬂuence of the weather:
• TECAPEEK (PEEK)*
• TECATRON (PPS)*
• TECASON P (PPSU)*
• TECASON S (PSU)*
• TECASON E (PES)*
• TECAFORM AH, AD (POM-C, POM-H)**
• TECAPET (PET)**
• TECAMID 6, 66, 11, 12, 46 (PA 6, 66, 11, 12, 46)**
• TECAST (PA 6 C)**
• TECAFINE (PE, PP)**
• TECARAN ABS (ABS)*
* All variations should be generally protected
** Variants not dyed black should be protected
3. Wherever possible, plastics should not be exposed to low temperatures over long periods. In particular, marked ﬂuctuations in temperature should be avoided, as this can cause semi-fnished products to warp or become brittle. Hard knocks and equally throwing or dropping should be
avoided, as otherwise cracks and fracture damage can occur. In addition, semi-fnished products stored in cold conditions should be allowed sufcient time to acclimatize to room temperature before processing. This can help to prevent defects such as cavities occurring during processing. It
will also help to compensate for shrinkage or also elongation after exposure to hot atmospheres caused by the high coefcient of linear thermal expansion of plastics. In order to store fnished and semi-fnished products for high levels of manufacturing precision, we consequently
recommend storage under constant conditions in a normal climate (23°C/50%rH). This allows external inﬂuences to be minimized and dimensional stability to be maintained over long periods.
It is not possible to specify a maximum storage period, as this depends heavily on the materials, storage conditions and external inﬂuences.
4. Semi-fnished products made of plastic should consequently always be stored ﬂat or on a suitable support (in the case of rods and tubes) and with the greatest possible surface contact in order to avoid deformation through their own intrinsic weight or warmth.
5. When handling plastic semi-fnished products, ensure that suitable warehousing equipment is used. Ensure that storage facilities, lifting gear, slings and other lifting equipment are stable and secure. Stock shapes must also be stored and stacked so as to eliminate any danger of tipping
or falling. Bear in mind here that plastics often have a relatively low coefcient of friction and are consequently easily able to slip out of load suspension devices, with the possibility of serious injury to staﬀ members.
6. Avoid the eﬀects of high-energy radiation such as gamma or X-rays wherever possible due to possible microstructure damage through molecular breakdown.
7. Plastic stock shapes should be kept away from all kinds of chemicals and water in order to prevent possible chemical attack or the absorption of moisture. Contact with chemicals or water can result in swelling, chemical decomposition or stress crack formation
8. Plastics are organic materials and consequently combustible. The combustion or decomposition products may have a toxic or corrosive eﬀect. If correctly stored, plastics themselves do not pose a fre risk. However, they should not be stored together with other combustible substances. On this subject, observe the product handling information sheets for the individual materials.
9. Under normal conditions, plastic semi-fnished or fnished products do not release any toxic constituents and permit risk-free surface contact. Tobacco products should not be allowed in the vicinity when handling and machining plastics, as particles of some plastics (in particular ﬂuoropolymers) can release strong toxic gases in some cases during pyrolization of the smouldering tobacco. In respect of health protection, please also note the product handling information sheets for the individual materials.
10. If the above recommendations are adhered to, it may be assumed that no signifcant changes to typical properties will occur during the storage period. It is possible that minimal surface discolouration may occur due to environmental inﬂuences. However, this does not represent any signifcant deterioration of material properties, as the surface is generally only aﬀected down to a few microns in depth.
11. Plastic waste and chips can be processed and recycled by professional recycling companies. It is also possible to send the waste for thermal processing to generate energy by a professional company in a combustion plant with a suitable emission control in place. This applies in particular to applications where the plastic waste produced is contaminated, e.g. in the case of machining chips contaminated with oil.
These recommendations should be adjusted expediently in line with individual requirements and circumstances. They do not replace the fundamentally applicable statutory regulations, or exonerate customers using the products from their responsibility or individuals from their duty of care. These are merely intended as recommendations drawn up on the basis of current knowledge. They do not
constitute any generally applicable assurance.