Industrial / Energy Fluids

XCELTHERM® SX500

XCELTHERM® SX500 is a polydimethylsiloxane-based fluid for laboratory/testing bath applications. XCELTHERM® SX500 can be used in open bath operating temperatures from ambient to 170°C (338°F), with outstanding oxidative stability properties. In closed systems, XCELTHERM® SX500 can be operated at temperatures from -40°C to 230°C (-40°F to 446°F), with excellent inherent thermal stability, assuring extended fluid life and optimal heat transfer efficiency.
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  • Typical Properties

    Key Operating Temperatures
    Open Bath System Bulk Operating Range -40°C to 170°C (-40°F to 338°F)
    Closed Loop System Bulk Operating Temperature, maximum -40°C to 230°C (-40°F to 446°F)
    Pour Point, maximum ≤ -60°C (-76°F)
    Flash Point by Cleveland Open Cup 346°C (655°F)
    Fire Point by Cleveland Open Cup 368°C (694°F)
    Autoignition Temperature 482°C (900°F)
    Pumpability at 300 cSt -41°C (-42°F)

     

    Physical Properties
    Appearance Clear, colorless
    Odor Characteristic
    Composition Polydimethylsiloxane
    Kinematic Viscosity, mm2/s (cSt) at 40°C (104°F)
    at 100°C (212°F)    		 37
    15.5
    Average Molecular Weight, g/mol 3600 to 3800
    Moisture Content, parts per million maximum 100 ppm
    Density at 25°C (77°F) 961 kg/m3 (8.0 lbs/gal)
    Specific Gravity at 25°C/25°C (77°F/77°F) 0.960
    Coefficient of Thermal Expansion at 200°C (392°F) 0.00105/°C (0.00055/°F)
    Refractive Index at 25°C (77°F) 1.402
    Dielectric Constant at 100 cycles at 23°C (73.4°F) 2.72
    Acid Number 0.02
    Viscosity – Temperature Coefficient 0.59
    Heat of Combustion 6.1 kcal/g
    Volatile Content at 150°C < 0.5%

     

    Data represents typical laboratory samples and are not guaranteed for all samples. XCELTHERM® is a registered trademark of Radco Industries, LLC

    © 2025 Radco Industries, LLC | All rights reserved

     

    Revision Date: 2025-01-06

  • Engineering Properties

    Temperature Viscosity Density Specific Heat Thermal Conductivity Vapor Pressure
    °C °F cP mm2/s (cSt) kg/m3 lbs/ft3 J/g-K BTU/lb-°F W/m-K BTU/ft-hr-°F kg/cm2 psia
    -60 -76 690 659 1061 66.25 1.368 0.3267 0.1535 0.0887
    -50 -58 443 426 1049 65.51 1.387 0.3312 0.1532 0.0885
    -40 -40 298 289 1037 64.76 1.406 0.3358 0.1529 0.0883
    -30 -22 208 204 1025 64.01 1.425 0.3403 0.1526 0.0882
    -20 -4 150 149 1013 63.26 1.444 0.3449 0.1523 0.0880
    -10 14 112 112 1001 62.51 1.463 0.3494 0.1520 0.0878
    0 32 85.3 86.0 989.3 61.76 1.482 0.3539 0.1517 0.0877
    10 50 66.4 67.8 977.3 61.01 1.501 0.3585 0.1514 0.0875 0.0000 0.0000
    20 68 52.7 54.5 965.3 60.26 1.520 0.3630 0.1511 0.0873 0.0063 0.0896
    30 86 42.6 44.5 953.3 59.51 1.539 0.3675 0.1508 0.0871 0.0074 0.1048
    40 104 34.9 37.0 941.3 58.76 1.558 0.3721 0.1505 0.0870 0.0086 0.1226
    50 122 28.9 31.2 929.3 58.01 1.577 0.3766 0.1502 0.0868 0.0101 0.1434
    60 140 24.3 26.6 917.3 57.27 1.596 0.3811 0.1499 0.0866 0.0118 0.1678
    70 158 20.6 22.9 905.3 56.52 1.615 0.3857 0.1496 0.0864 0.0138 0.1964
    80 176 17.6 19.9 893.3 55.77 1.634 0.3902 0.1493 0.0863 0.0162 0.2297
    90 194 15.2 17.5 881.3 55.02 1.653 0.3948 0.1490 0.0861 0.0189 0.2688
    100 212 13.2 15.5 869.3 54.27 1.672 0.3993 0.1487 0.0859 0.0221 0.3145
    110 230 11.6 13.8 857.3 53.52 1.691 0.4038 0.1484 0.0857 0.0259 0.3679
    120 248 10.2 12.4 845.3 52.77 1.710 0.4084 0.1481 0.0856 0.0303 0.4305
    130 266 9.00 11.2 833.3 52.02 1.729 0.4129 0.1478 0.0854 0.0354 0.5037
    140 284 8.01 10.2 821.3 51.27 1.748 0.4174 0.1475 0.0852 0.0414 0.5893
    150 302 7.15 9.31 809.3 50.52 1.767 0.4220 0.1472 0.0851 0.0485 0.6895
    160 320 6.41 8.54 797.3 49.77 1.786 0.4265 0.1469 0.0849 0.0567 0.8067
    170 338 5.77 7.87 785.3 49.02 1.805 0.4311 0.1466 0.0847 0.0664 0.9438
    180 356 5.21 7.28 773.3 48.28 1.824 0.4356 0.1463 0.0845 0.0776 1.1043
    190 374 4.72 6.76 761.3 47.53 1.843 0.4401 0.1460 0.0844 0.0908 1.2920
    200 392 4.28 6.30 749.3 46.78 1.862 0.4447 0.1457 0.0842 0.1063 1.5116
    210 410 3.90 5.89 737.3 46.03 1.881 0.4492 0.1454 0.0840 0.1243 1.7686
    220 428 3.56 5.52 725.3 45.28 1.900 0.4537 0.1451 0.0838 0.1455 2.0692
    230 446 3.25 5.19 713.3 44.53 1.919 0.4583 0.1448 0.0837 0.1702 2.4210
    240 464 2.98 4.89 701.3 43.78 1.938 0.4628 0.1445 0.0835 0.1991 2.8326
    250 482 2.73 4.62 689.3 43.03 1.957 0.4674 0.1442 0.0833 0.2330 3.3141
    260 500 2.51 4.38 677.3 42.28 1.976 0.4719 0.1439 0.0831 0.2726 3.8775
    Data represents typical laboratory samples and are not guaranteed for all samples.
    XCELTHERM® is a registered trademark of Radco Industries, Inc.