Technologic Papers of the Bureau of Standards Volume 151-160 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...determined by means of it. In the preparation of these compounds the fiber as well as all of the fillers were dried before weighing out the batch. B. No Cellulose B S. S3--Continued. Per cent Sulphur 2.0 Lampblack 4. o Fiber None. 100. o S. B. 5.. ===== Plantation crepe 60. o Golden antimony 5. o Zinc oxide 10. o Lithopone 10. o Thiocarbanilide 2. o Sulphur 3. o Iron oxide 10. o Fiber None. S. S3.. First latex 48. o Zinc oxide 22.0 Litharge 24. o Blank determinations made on the above mixings showed losses due to acetylation of 0.0006 g, 0.0007 gi and 0.0006 g, respectively. The results obtained indicate that of the material which was insoluble in 10 per cent hydrochloric acid, and was present throughout the acetylation, nothing was dissolved by the acetylation reagents. Evaporation and ignition of the filtrate revealed no residue. It is evident that the method will not give misleading results, and that no cellulose will be indicated by it when it is not present. Stocks Containing Cellulose in the Form of Cotton Fiber C-I.. Per cent C-3.. Smoked sheet 50. o Zinc oxide 30. o Whiting 6. o Chrome green 3.0 Sulphur 3.0 Cotton fiber 8. o Per cent Plantation 59. o Gas black.-5. o Zinc oxide 30. o Sulphur....: 5. o Cotton fiber 1. o First latex 4-Mineral rubber 50 Gas black 15.0 Zinc oxide 30-0 Magnesium oxide 2.0 Magnesia, light 3. o Sulphur 2. o Cotton fiber 3.0 100. o C-3.. Cellulose o. 98 C-4.. Cellulose 2. 93 The above results indicate clearly without further discussion that by this method it is easy to determine widely varying amounts of cotton fiber very accurately even when accompanied by a miscellaneous collection of mineral fillers in the rubber compound. Attention is called to C-4, where 15.0 per cent of gas black was present. It was possible to get goo...