Environmental Stability Testing of a Coated, Elastomeric Dental Ribbon.
Abstract
A coated, elastomeric dental ribbon developed by Dr. Paul Jaffe with Cooper Laboratories was taken through a series of physical tests at various environmental conditions to determine its suitability for military application. Tensile properties and Tensile Impact Strengths were determined at -40, 0, 73 and 120 Fahrenheit. Yield Strengths were 3730, 2170, 1130 and 1100 (p.s.i.) respectively. Break Strengths were 4150, 5030, 5260 and > 4500 (p.s.i.) respectively. Percent Elongations at breakage were 540, 640, 600 and > 700 (percent) respectively. The dental tape was placed in circulating air ovens at room temperature as a control, at 160 F with 90% relative humidity, at 194 F and 230 F for six and twelve weeks. After exposure, the specimens were removed and allowed to condition for a minimum of 40 hours at 73 F with 50% relative humidity. They were again tested for Tensile properties and Tensile Impact Strength. The Yield Strengths were 1130, 1630, 1830, 1380, 1390 and 2200 (p.s.i.) respectively. The Break Strengths were 5260, 4930, 3910, 2300, 1660 and 2700 (p.s.i.) respectively. No blocking was observed at -60, 73 and 160 F for a maximum of one month duration at 0.5 p.s.i. pressure. Little dimensional changes were noted at 160 F with 90% relative humidity, 194 F and 230 F, up to twelve weeks. Samples exposed at 266 F for six weeks were too brittle to be tested.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1979
- Accession Number
- ADA082625
Entities
People
- Gary J. Shemaka
- William W. Tenero