Tape characteristics

If a magnetic tape is used for transferring the file, it has to have the following characteristics  

The last block on the file has to be padded with space characters if needed. 

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Table 1 Tape characteristics with respect to the resulting split-film fineness...

The thickness of the tape is controUed by the sHp characteristics, the height of the doctor blade, the casting rate, and the pressure head of the sHp reservoir behind the doctor blade. SHp viscosities in the range of 1 5 Pa-s (10—50 P) are used to cast tapes at 5—100 cm/s. To achieve the desired strength and flexibUity in the green tape, tape casting slurries contain more binder than those used in sHp casting, as weU as a plasticizer to ensure flexibUity. 

Passive transdermal dehvery systems on the market tend to be either matrix or membrane controUed. In matrix devices, the stmctural and molecular characteristics of the dmg-polymer matrix determine dmg release. Examples of polymer matrix-controUed diffusional systems for angina prophylaxis include Nitro-Dur and Nitrodisc, which provide transdermal dehvery of nitroglycerin [55-63-0], and Erandol, a tape that releases isosorbide dinitrate [87-33-2]. Matrix diffusional systems have been used for dehvering dmgs with a wide therapeutic index. 

ABS materials are widely used as impact modifiers but cause opacity and have only moderate aging characteristics. Many grades show severe stress-whitening, generally a disadvantage, but a phenomenon positively employed in labelling tapes such as Dymotape. 

It is advisable to identify all your quality records within your procedures. This will avoid arguments on what is or is not a quality record, because once you have chosen to identify a record as a quality record you have invoked all the requirements that are addressed in this chapter. Any document which describes the achieved features and characteristics of a product or service are quality records. Those records which will demonstrate that work has been planned, organized, resourced, monitored, verified, and corrected when found deficient are also quality records. The note following the requirement acknowledges that quality records can be in hard copy or held on a computer disk or magnetic tape. Should both forms be held, you will need to declare which are the masters and provide the appropriate security to prevent inadvertent loss or damage (see below). 

The self-adhesive tape coatings are thin and the adhesive itself does not necessarily come into contact with the valleys in the cleaned metal surface. Under these circumstances, the transmission of water vapour through the film to the metal may be possible. Moisture-transmission characteristics and other properties of p.v.c. and polyethylene tapes, as given by major manufacturers, are provided in Table 14.6. 

Corbin SF, Lee J, and Qiao X. Influence of green formulation and pyrolyzable particulates on the porous microstructure and sintering characteristics of tape cast ceramics. J. Am. Cer. Soc. 2001 84 41 17. 

ANALYZER (Reagent-Tape). The key to chemical analysis by this method is a tape (paper or fabric) that has been impregnated with a chemical substance that reacts with the unknown to form a reaction product on the tape which lias some special characteristic, e.g., color, increased or decreased opacity, change in electrical conductance, or increased or lessened fluorescence. Small pieces of paper treated with lead acetate, for example, have, been used manually by chemists for many years to determine the presence of hydrogen sulfide in a solution or in the atmosphere. This basic concept forms the foundation for a number of sophisticated instruments that may pietreat a sample gas, pass it over a cyclically advanced tape, and, for example, photo-metrically sense the color of the exposed tape, to establish a relationship between color and gas concentration. Depending upon tile type uf reactiun involved, the tape may he wet or dry and it may be advanced continuously or periodically. Obviously, there are many possible variations within the framework of this general concept. 

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