ASTM  Property Tested       Test Units            Acetal        Acetal       Glass filled   Delrin®
 Test                                           (Homopolymer)  (Copolymer)    Acetal
Method       
       PHYSICAL  
D638  Tensile Strength       p.s.i.                10,000        9,000        12,000         7,600
D638  Elongation (Break)     %@73°F.               75            60           --             22
D1822 Tensile Impact         ft.lbs./sq.in.        170           90           --             50
D695  Compressive Strength   p.s.i. (at yield)     18,000        16,000       16,500         13,000
D790  Flexural Strength      p.s.i.                14,300        13,000       20,000         10,500
D256  Impact Strength        ft.lbs./in@73°F       2.3           1.5          .8-1.0         1.2
      (Notched IZOD)
D785  Hardness Rockwell      R-M                   R120          M80          M79            R118
D621  Deformation Under      %(122°F, 2000         0.5           --           0.5            0.6
      Load                   p.s.i. 24 hrs.)
      THERMAL
D696  Thermal Conductivity   B.T.U./hr./sq.ft./of  2.6           --           --             --
D648  Thermal Expansion      in.                   5.8 x 10      4.7 x 10     --             5.8 x 10
D789  Heat Deflection        in./in.°F             342           320          326            334
      Melting Point          °F@ 66 p.s.i.         277           230          292            244
                             °F@ 264 p.s.i.        347           329          331            347  
      ELECTRICAL
D149  Dielectric Strength    Volts/mil             500           500          --             400
D257  Volume Resistivity     OHMS/cm.              10            --           1.2x10         3x10
D150  Dielectric Constant    
      100 HZ                                       3.7           3.8          3.8            3.1
       10 HZ                                       3.7           3.8          3.8            3.1
D150  Dissipation (Power Factor)
      100 HZ                                       --            0.0010       0.0021         --
       10 HZ                                       --            0.0010       0.0020         --
       10 HZ                 Seconds               0.005         0.0005       0.0061         0.009
      Arc Resistance                               220           --           200            183
      Chemical
D543  Chemical Resistance
      @ 73°F                 Weak Acids            Resistant     Resistant    Resistant      Resistant
                                                   to Some       to Some      to Some        to Some
                             Strong Acids          Attacked      Attacked     Attacked       Attacked
                             Weak Alkalies         Resistant     Resistant    Resistant      Resistant
                                                   to Some       to Some      to Some        to Some
                             Strong Alkalies       Attacked      Attacked     Attacked       Attacked
      Miscellaneous
D792  Specific Gravity       Grams/C.C.            1.42          1.41         1.58           1.54
D570  Water Absorption       %(24 hrs.)            0.25          0.22         0.25           0.20
D635  Burning Rate                                 Slow          Slow         Slow           Slow