ยางโอริง (O-ring) - mahidolrubber.org

1 1930 (DuPont) ( ) .. 1937 (Niels Christensen) (O-ring inside diameter; ID) (O-ring cross section; w) 20 mm 2 mm 20x2 mm 1.

2 (thermoset) 2. (thermoplastic) (low density polyethylene; LDPE) (high density polyethylene; HDPE) 1. (static seal) 2 100%2. (dynamic seal) (shaft) (housing) 5,000 psi reciprocating seal, oscillating shaft seals, rotating shaft seals 3.

3 Valve seat seals, pneumatic or vacuum seals, crush seals 1 1. (pneumatics) 7 70 Shore A (hydrolic) 80-90 Shore A 2. 2 (O-ring) 2 1 (Shore A) ( C) (Buna N) N770-40 110 N9 (high pressure static) N9 90 (Viton)V775-35 205 V9 (high pressure static) V9 90 ( ) C770-55 140 ( )

4 ( ) E770-55 150 S770-85 230 (static) (fluid)static sealoscillating sealrotary seal seat seal reciprocating seal crush installation wiper installation 1. - / / ( ) (phr) A B (Perbunan 38 0T)* 100 100 (N990) 20 20 (N765) 50 50 DOP 20 20 5 5 3 3 80% DTDM 80%** - Vultac-TB710-50% - 3 MBS 75%** - CBS 80% - Vulkalent E.

5 * EMAC ** 4 3 A B 10% (MPa) 100% (MPa) 200% (MPa) (%)545 635 (Shore A)56 56 (kN/m)21 23 IRM 903 100 C 7 - (%)** - (Shore A) 9 2 3 Vultac ( B) A / / IRM 903 - / / ( ) 5 (phr) (Europrene N 3330)*100 3 (N550 FEF)30 (N762 SRF)45 Vulkanok MB22 Annox HB2 DOP9 Dicup.

6 * Polimeri Europa 6 5 170 C 10 - (MPa) - (%) - (Shore A) - 100 C 70 (%) 270 70 11 ASTM # 3 125 C 70 - (%) - (%) - (Shore A) - (%) -4 1 -11 7 ASTM # 2 125 C 14 - (%) - (%) - (Shore A) - (%) 8 -13 1 ASTM # 5 125 C 70 - (%) - (%) - (Shore A) - (%) 4 -2 Fuel A 23 C 70 - (%) - (%) - (Shore A) - (%) -2 -5 -7 Fuel B 23 C 70 - (%) - (%) - (Shore A) - (%) -15 -45 -35 26 100 C 70 - (%) - (%) - (Shore A) - (%)

7 0 1 -8 4 (50:50) 100 C 70 - (%) - (%) - (Shore A) - (%) -1 2 -11 2. 1. 2. (die) (remill) 45 (bias cut) joined o-ring (compression mold) 2 single cavity multiple cavity (injection mold) 6 5 ( )

8 Single cavity 1 multiple cavity 3. (flash) 2 - ASTM D1414 - 94(2008) Standard Test Methods for Rubber O-Rings , and Hewitt, N., The rubber formulary New York, 443-444, , , 1 , , 2540. (mixing) (milling)