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DBPA: what is dibutylphthalate oil absorption (DBPA)?


Dibutylphthalate oil absorption is a technique used to quantify the amount of structure characteristic of a grade of carbon black. Higher DBP oil absorption numbers correspond to higher carbon black structure.
Decreasing particle size: how does decreasing particle size affect plastic compound properties?


As carbon black particle size decreases the following properties will be affected: masstone or jetness becomes darker; tinting strength becomes stronger; masterbatch viscosity will be higher; carbon black dispersability will be more difficult.
Do Cabot's carbon blacks contain any substances believed to be endocrine disruptors, such as phthalates or nonyl phenols?


Cabot is not aware that any purported endocrine disrupters, such as phthalates and nonyl phenols are contained within the raw material (feedstock) or additives used during carbon black manufacture. In addition, Cabot believes that endocrine disruptors are not produced during the manufacturing process. Therefore, under normal circumstances, these compounds would not be expected to be present in our final products.<BR><BR>Under some regulations, benzo(a)pyrene is classified as an endocrine disruptor. Carbon black contains some polycyclic aromatic hydrocarbons as impurities. If you have a question regarding the possible presence of benzo(a)pyrene in the carbon black product you are using, contact our technical service department.
Do grades of carbon black have a single aggregate size?


In all grades of furnace carbon black, the aggregates are present as a distribution of aggregate sizes.
Does Cabot provide liquid dispersions of carbon black?


Although Cabot is not a provider of liquid dispersions of conventional carbon black , we work closely with a number of businesses, called dispersion houses, specializing in the manufacture of these types of carbon black dispersions. Whether you need an aqueous or hydrocarbon based dispersion, we can recommend an appropriate vendor.<BR><BR>Novel aqueous carbon black dispersions are available from our InkJet Business. These dispersions are prepared utilizing proprietary surface modification technology.
Does the physical form of carbon black affect dispersion rate?


Carbon black may be used directly in its fluffy form or as pellets, which are denser. Pelleted carbon blacks are easier to handle and incorporate faster than fluffy carbon blacks; however, pelleted blacks are more difficult to disperse. This is because the densifying process increases the proximity of the aggregates and thus increases the Van der Waals attractive forces which must be overcome in the dispersion process.
Electronics Packaging: What are the typical applications in the area of electronics packaging?


Typical applications include: crates made of conductive PP, carrier tapes made of conductive PS, bags made of conductive LDPE.
Elements in carbon black: can carbon black contain elements other than carbon?


Since furnace type carbon blacks are made from petroleum feedstocks, carbon black can contain varying amounts of other elements. An element commonly found in carbon black is sulfur which, in some grades, can be present at levels above 1 wt%. For conventional non-oxidized grades of carbon black, oxygen can be found as chemisorbed organic oxygen groups at levels up to 2%. This level depends on the process conditions and heat history of the carbon black.
ESD: Can the risk of ESD be reduced? If so, how?


You can reduce ESD by allowing the static charge to be conducted harmlessly to earth. This can be achieved by using conductive materials.<BR><BR>Most natural thermoplastic resins are normally electric insulators. Carefully designed formulations of conductive carbon blacks and the same resins can change their electrical characteristics from insulating to conductive.<BR><BR>Cabot has developed a range of compounds that are electrically conductive and therefore greatly reduce the risk of a catastrophic discharge of electrostatic energy.
ESD: what does ESD mean?


ESD stands for Electro Static Discharge. An electrostatic discharge is a transfer of electrostatic charges between bodies at different electrostatic potentials caused by direct contact or induced by an electrostatic field.<BR><BR>Static electricity is part of everyday life. At some time or another, everybody gets a shock, for example, by walking across a nylon carpet (= generation of static electricity) and then touching the lift (elevator) button (= electrostatic discharge). Although annoying, this is not always dangerous, but in certain areas, a static spark can lead to disastrous events