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NATURAL
RUBBER PRCNR - 35
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PRODUCT:
PRC Mat'l NR - 35 is a soft cream color pure gum
naturalrubber for general purpose abrasion and HCL service. All ingredients conform
to the FDA White List. Cured durometer is from 30 to 45 Shore A depending on curing
conditions utilized. |
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TENSILE: |
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ASTM D412 |
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2500 min. |
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% ELONGATION: |
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ASTM D412 |
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650 min. |
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DUROMETER: |
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ASTM D2240 |
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35 +/-5 |
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SPECIFIC GRAVITY: |
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ASTM D927 |
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1.00 +/-.03 |
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WEIGHT: |
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1.30 lbs. ft² @ .25" thick |
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POLYMER TYPE: |
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100% Natural Rubber |
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COLOR: |
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Tan |
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ADHESIVES: The standard Chemlok Systems for natural rubber are
recommended. The system may include Chemlok 289 (green) Primer, Chemlok 290 (red)
Bonding Adhesive, & Chemlok 286 (black) Tack Cement. |
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CURE CONDITIONS: Under ideal laboratory conditions using a
Rheometer the following cure time/temperature parameters occurred. However, as the
actual time to heat, ambient temperature, mass of medal and other issues greatly effect
cure times, a suggested time/temperature parameter is included for reference:
| IDEAL LAB
CONDITIONS |
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SUGGESTED
TIME/TEMP @ 1/4" |
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| 280F (137.8C) 34.5 psig |
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28.5 min. |
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60 min. |
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| 260F (126.7C) 20.7 psig |
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53.9 min. |
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100 min. |
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| 250F (121.1C) 15.1 psig |
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67.8 min. |
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1.5 hours |
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| 212F (100.0C) ) psig |
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422 min. |
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Atmospheric |
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16 hours |
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