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Glues And Gelatine - Introductory
Through laxity of usage, the term glue, from gluere to draw together has been extended to include all solutions of substances exhibiting binding or adhesion. Its legitimate application comprehends only those viscous adhesive bodies resulting from the treatment of animal bones or tissues, as well as the bladders and certain membranes of fish.
Classification And Testing Of Glues
It is obvious that the manufacturer, in assigning a price to the finished glue, must reckon with the cost of stock, labor, etc. Theoretically, he might base the price upon these considerations alone.
Analysis Of Glue And Gelatine
In discussing the methods applicable to the assay of the constituent elements of glue and gelatine, as well as of the impurities they may contain, it must be reaffirmed at the outset that analysis supplies no data as to the strength of the product.
Glue And Gelatine Substitutes
WHERE adhesiveness is the chief end to be attained, proteid substances other than glue, as well as a number of vegetable products, may be used in the place of glue. Certain algae gelatinize from solution and hence are available as substitutes for gelatine in some classes of work.
Foreign Glues
A considerable proportion of the glue consumed annually in the United States is of foreign manufacture and, were not the tariff duty on these goods so high as to be almost prohibitive in many instances, it is to be feared that some grades would supplant the corresponding domestic in certain classes of work.
Selection Of Glue For Various Industries
While no definite rule can be enunciated relative to the selection of a glue for a specific usage, attention must be paid to certain fundamental considerations. Experience is the safest and surest guide in glue selection; but experience, with glue, is to be acquired only at great pains and expense.
How Glue Should Be Used
IT would seem superfluous, after discussing in detail the nature and properties of glue, as well as emphasizing the necessity of exercising the greatest care in its selection, to remark that its success in work will depend in a large measure upon intelligent preparation and application.
Glue - Commercial And Legal Aspects
Trade Conditions Affecting the Price of Glue. Close study of the glue industry reveals conditions extant in few, if any, other lines of business. The laws of supply and demand, universally recognized as the basic influences affecting the price of any commodity, are here factors of but secondary importance.
Glue Manufacturing
THE following working formule are all practical, having been tested by the author. A number represent standard formule which have been hitherto published in a number of works on glue, having been known for years to investigators. Others, again, are the result of the author's personal experience. Carefully carried out, they will all yield satisfactory results.
Glue - Analytical Operations
WHILE not at all averse to consulting a qualified chemist when need of his services arises, progressive superintendents frequently desire to carry out for them-selves the simpler analytical operations, if only that they may thereby better comprehend the import f the chemist's work.
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