White factice

Similarly, in the case of a cup type mount, an initial attempt to restrict resonance amplification featured the use of white factice in a NR formulation. However, the successful formulation was a blend of predominantly bromobutyl with NR, as shown in Table 6. 

A compounding ingredient with the main functions of a processing aid or extender. Dark factice (sulphur factice) is produced by heating certain unsaturated oils (principally rape seed oil) with sulphur. White factice (sulphur chloride factice) is prepared by treating rape seed oil with sulphur monochloride at normal temperatures. Factice is still sometimes referred to as mbber substitute or simply sub , but these terms are not recommended. 

A basic substance used particularly in compounds containing large quantities of white factice to offset the retarding effect of the factice. Also used to prepare emulsifying agents in latex compounding. 

The addition level for the different applications varies from 5-10 phr for moulded articles to 15-30 phr for extrusions. Roller coverings, dependant upon hardness, are often made using factices to facilitate grinding operations. Special products such as erasers use factice, usually white factice, at levels between 200-400 phr. 

Clear unsaturated oils are vulcanised at room temperature with sulphur monochloride to give a white, friable solid which is nonstaining and suitable for use in coloured compounds. Crosslinking using sulphur monochloride produces a white factice, but care had to be taken in its use, for if not used when fresh it develops a high level of acidity which affects compound cures severely. The acidity can be removed by steaming the factice just prior to use. Modem white factices contain a small addition of alkali to counteract any developed acidity. 

AA White Factice. [Am.Cyanamid] Sulfur chlorinated vegetable oil extender, plasticizer, softener for NR, SR facilitates extrusion retards cure. 

Factice is produced from fatty oils such as linseed oil, castor oil, soybean oil, or rape seed oil. To obtain brown factice, the oil is heated with sulfur to 130-160 C for 6- 8 h. This vulcanization gives a soft, crumbly, elastic product with 5%-20% sulfur. White factice is obtained by vulcanization of the oil with S2CI2 at room temperature. It contains 15%-20% sulfur and is not elastic. Both types of factice are used as cheap bulking materials in rubber articles, and improve the calendering processing of natural rubber. 

White factices, produced by normal methods of manufacture, are not entirely thermally stable and evolve HCl at vulcanizing temperatures. Similarly, if stored for any great length of time prior to incorporation in a rubber compound, HQ can be generated which will affect cure characteristics. If old white factice is to be used, it should be steamed first to remove the HQ. 

White factice is made by reacting relatively saturated oils, such as castor or rapeseed with liquid sulfur monochloride. The reaction takes place at room temperature, forming a light-colored, more or less crumbly material which sees wide use as lead pencil erasers. 

The choice of vulcanizing agents has been much the same for the past 150 years with the exception of the use of an isocyanate cross-linker added during the last 50-60 years. Elemental sulfur (brown factice), sulfur chloride (white factice), hydrogen sulfide (light yeUow/translucent factice), isocyanate, and peroxide (very white/hard/translucent factice) comprise the main types employed for vulcanizing vegetable oils. 

Factice is used infrequently for special effects in S-B-S and similar thermoplastic elastomers. As an example, pencil erasers formulated with styrenic TPRs contain relatively high loadings of white factice. 

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