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Die deposit: what is Die Deposit?


During extrusion, some particles can break away from the melt and stick on the external face of the die lips. With time, the die surface become more and more crowded with material and finally this deposit is clearly visible. This phenomenon is generally called die deposit, die build-up or die drool.
If a masterbatch is approved for indirect food contact applications according to European Economics Community (EEC) regulation, may I use it for food applications in a specific country...in Italy for example?


No, not directly, at least. You also need to check if the masterbatch is approved for indirect food contact applications according to the legislation of that specific country. In fact, the EEC directive (90/128/EEC) still has to be "accepted" in some specific (European) Countries. Therefore, in many European countries we still have to take into account the national (local) legislation.<BR>In the case of Italy, the Italian regulation (DM 24.09.96) is MORE restrictive than the EEC one; therefore, it may happen that a masterbatch food approved by EEC, is not approved by the Italian regulation, and consequently, cannot be used to produce items to be sold in Italy for food contact applications.
If I use a 50% SRF masterbatch at X% to color my final product, what is the necessary addition rate of a 40% HAF masterbatch to get the same opacity? Would it be > or < than X%?


According to our experience, if a 40% HAF masterbatch is added at the same percentage (say X%) as a 50% SRF masterbatch, the opacity will be higher with the HAF grade. This is true for standard addition rates (if saturation is reached, no further difference can be noticed in opacity). It should be also noted that the undertone will be different, switching from a SRF to an HAF carbon black.
Indirect Food Contact Applications: What does indirect food contact mean?


Indirect food contact relates to an application in which a product (such as masterbatch) is used to produce containers/bags that contain food. On the other end of the spectrum, direct food contact relates to a product that comes into contact with the human body (for instance, if the product is eaten). At Cabot, applications in which a masterbatch is used to produce containers/boxes/bags/trays, are marked as approved for indirect food contact.
Universals: Cabot sells a range of grades called "Universals," also known as UN. Does it mean I can use them with any polymer, including PBT, POM, PET, etc.?


Our UN grades are compatible with a wide variety of polymers, such as PS, ABS, SAN, LDPE, LLDPE, HDPE, PP. They also show limited compatibility with PA, PVC, PET, PC. For a better compatibility with engineering polymers (PC, POM, PBT, PET, PMMA), more suitable grades exist in Cabot range, such as EG3807 or PT4209 (the latter only in PET applications)