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, Inc.

    © 2025 Radco Industries, Inc. | 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.

    © 2025 Radco Industries, Inc. | All rights reserved

    * Data represents typical laboratory samples and are not guaranteed for all samples
    ** Enthalpy basis is liquid crystallizing point of 53.6ºF (12ºC)