Download or read book Effect of Temperature on the Storage Life of Polysulfide Aircraft Sealants written by and published by . This book was released on 1989 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Temperature on the Storage Life of Polysulfide Sealants written by and published by . This book was released on 1989 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: The storage performance of a range of PR-1422, PR-1436G and PR-1750 two part polysulfide aircraft sealants of A and B classes, packaged both in cans and Semkit form, has been surveyed. The sealants were separately maintained at temperatures of -16, 2, 13 and 25 C and changes in viscosity of the polymer base compound, cure rate, peel strength and application life were monitored over 26 months. Concurrent changes in thiol content of the liquid polymer in the base compound and concentrations of Manganese(IV) or Chromium(VI) in the cure pastes were also determined. Variations in activity of cure pastes with time were assessed using LP-32 as a standard polymer and changes in polymer base compounds were monitored by measuring cure rate with laboratory prepared reference cure pastes. Low temperature storage extended storage life significantly. After maintenance at temperatures of 2 degs and below, the canned sealants still performed satisfactorily after two to three years storage. Most materials were procured several months after manufacture and with reduction of acquisition time further extension of the low temperature storage life could be expected. No significant storage differences between PR-1750 and PR-1422 sealants or the A or B classes were noted. Dichromate-based cure pastes were prone to lose solvent at higher storage temperatures and some dried pastes resulted. The main cause of failures was oxidation of the polymer base compound which led to surface skinning and was accompanied by a gradual drop in thiol content. Peel strength was unaffected by storage and the concentrations of Mn(IV) and Cr(VI) were little changed.
Download or read book Studies of the Effects of Sub Zero Storage Temperatures on the Properties of Pre Mixed Polysulphide Sealants written by John W. Barber and published by . This book was released on 1980 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pre-mixed polysulphide sealants were stored at -20, -30 and -40 C for selected intervals and then tested for conformity for the requirements of the appropriate MIL-specification in regard to cure rate or hardness, application time, tack-free time and peel strength. For Pro-Seal 899 and PR-1750 sealants, no significant change in hardness or peel strength occurred after prolonged storage at temperatures of -20 C and below; a minor decline in peel strength occurred with PR-1422. Application properties were also maintained for extended periods and at -40 C tests terminated only due to consumption of samples after storage times ranging from 7 to 16 weeks. These storage lives far exceed manufacturers' limits. Batch variations and stricter observation of class requirements could influence recommended storage times but at -40 C even materials such as PR-1750, which have a close tolerance in application life rating, may be pre-mixed and be safely stored for at least 10 weeks. Both class A and B sealants may be stored in pre-mixed form provided their application lives are at least 2 hours. Thawing is most conveniently and efficiently achieved by allowing the frozen sealant to equilibrate at room temperature. (Author).
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Chemistry and Technology of Thermosetting Polymers in Construction Applications written by M.H. Irfan and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymeric products are used widely in the construction industry, because they offer a range of desirable performance properties not available from traditional materials. Development of these products continues in a number of major research and development programmes within the construction materials sector, aimed at improving the performance, durability and applicational properties of these materials. It seems certain that their use will increase as their overall performance is developed and as the industry becomes more familiar with the techniques required to apply these materials and the benefits they offer. The purpose of this book is to familiarise the reader with the range of thermosetting polymeric materials available for construction applications, and to provide sound information on the properties and applications of these important materials. Professional engineers involved in the specification, application and testing of these materials will find this book a compact, authoritative and comprehensive source of information on these materials. Chemists and technologists involved in developing new or improved formulations will find in this book much to inform their work, particularly in the important area of applicational properties.
Download or read book Department Of Defense Index of Specifications and Standards Alphabetical Listing Part I November 2005 written by and published by DIANE Publishing. This book was released on with total page 770 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index of Specifications and Standards written by and published by . This book was released on 2005 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymeric Materials Encyclopedia Twelve Volume Set written by Joseph C. Salamone and published by CRC Press. This book was released on 2020-07-17 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Polymeric Materials Encyclopedia presents state-of-the-art research and development on the synthesis, properties, and applications of polymeric materials. This groundbreaking work includes the largest number of contributors in the world for a reference publication in polymer science, and examines many fields not covered in any other reference. With multiple articles on many subjects, the encyclopedia offers you a broad-based perspective on a multitude of topics, as well as detailed research information, figures, tables, illustrations, and references. Updates published as new research unfolds will continue to provide you with the latest advances in polymer science, and will keep the encyclopedia at the forefront of the field well into the future. From novices to experienced researchers in the field, anyone and everyone working in polymer science today needs this complete assessment of the state of the art. The entire 12-volume set will be available in your choice of printed or CD-ROM format.
Download or read book Aeronautical Engineering written by and published by . This book was released on 1991 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1991 with total page 832 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1990 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1990 with total page 1312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sealing Compounds Quick Repair Low Temperature Curing Polysulfide for Aircraft Structures written by AMS G9 Aerospace Sealing Committee and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This specification establishes requirements for two types and classes of a two component, low temperature curing, polysulfide, sealing compound for use as a quick-repair material for aircraft structure. This document has been determined to contain basic and stable technology which is not dynamic in nature.
Download or read book Australian National Bibliography written by and published by National Library Australia. This book was released on 1978 with total page 1734 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Materials Forum written by and published by . This book was released on 1993 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book R D Abstracts written by Technology Reports Centre (Great Britain) and published by . This book was released on 1981 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Drexel Polymer Notes written by and published by . This book was released on 1991 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt:
