Flashcards on Aviation Maintenance Technician Handbook
Aviation Maintenance Technician Handbook: Nonmetallic Materials Guide
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Rubber
27 cards
Card 1
Question: What are the primary functions of rubber (caucho) as used in engineering applications?
Answer: To prevent entry of dirt, water or air; prevent loss of fluids, gases or air; absorb vibrations; reduce noise; and cushion impact loads.
Card 2
Question: What does the term "rubber" (caucho) include?
Answer: Natural rubber plus all synthetic rubbers and silicone rubbers.
Card 3
Question: List key physical and processing advantages of natural rubber over synthetic and silicone rubbers.
Answer: Better flexibility, elasticity, tensile strength, tear resistance, and low heating from flexing (low hysteresis).
Card 4
Question: Why is natural rubber limited for some aircraft uses?
Answer: It has lower resistance to many degrading influences, swells and often softens in aviation fuels and many solvents, and deteriorates faster than synth
Card 5
Question: For what application is natural rubber commonly used despite its limitations?
Answer: As sealing material for water/methanol systems.
Card 6
Question: What general characteristic distinguishes different types of synthetic rubber?
Answer: They are composed of different materials to give desired properties; common types include butyl, Buna (Buna-S, Buna-N), and neoprene.
Card 7
Question: What are the key properties of butyl (butyl rubber)?
Answer: Superior resistance to gas permeation, good resistance to deterioration, lower physical properties than natural rubber, resists oxygen, vegetable oils
Card 8
Question: What fluids and conditions is butyl rubber suitable for?
Answer: Hydraulic phosphate ester fluids (Skydrol™), silicone fluids, gases, ketones and acetones.
Card 9
Question: How does Buna-S compare to natural rubber and what are its limitations?
Answer: Buna-S resembles natural rubber in processing and performance, is as water-resistant as natural rubber, ages somewhat better, and has good heat resist
Card 10
Question: What are common uses for Buna-S?
Answer: Tires and inner tubes as a substitute for natural rubber.