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Nitrile Rubber

Nitrile Rubber

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Nitrile Rubber

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  1. Nitrile Rubber By: Jessica M. Lopez MEEN 3344

  2. Nitrile Rubber • Polymeric mixture of butadiene and acrylonitrile in the respective ratio 2:1. • Ratios can be varied to change physical properties...higher levels of acrylonitrile yield low temperature flexibility, and increase compound hardness • Highly polar elastomer (large and reversible elsatic deformation)

  3. Physical Properties

  4. Chemical Resistance

  5. Uses • Vibration Control of horizontal forces up to 125 tons • O Rings, gaskets, sealants, grommets and tubing pads • Frequently used in automotive air conditioning systems employing R-134a refrigerants

  6. Environmental Deficiencies • Nitrile should not be exposed to • direct sunlight • moderate to high levels of atmospheric ozone • oxygen • Must be used in a closed system

  7. How to overcome • Nitrile accepts antidegradants, which improve the aforementioned properties • PVC (polyvinyl chloride) • Hydrogenation

  8. Hydrogenated Nitrile Rubber • High tensile strength • Low permanent set • Good abrasion resistance • High elasticity • Stability toward thermal ageing • Better properties at low temperatures

  9. How It’s Made • Nitrile rubber is hydrogenated in solution using precious metal catalysts • Carbon-carbon bonds are converted to more stable single bonds (controls different states) • Can be crosslinked using sulphur and peroxide cure systems

  10. Nitrile 1/32” thick $14.80 per square yard ¼” thick $72.20 per square yard Hydrogenated Nitrile 2 to 3 times more expensive than the conventional polychloroprene used now New features will allow it to last 5.5 times longer Cost Estimations

  11. References • ATAS International B.Vhttp://www.atas-int.com/ap-note/TECHNNO_23.pdf • R.T. Enterprizes http://www.rtenterprises.com/comp_nitrile.htm • Callister, William D, Materials Science, An Introduction 6E, John Wiley & Sons, Inc, 2003 • American Rubber Group http://www.americanrubbergroup.com/