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Duratherm S

A silicone based heat transfer fluid that is ideally suited for high oxidation applications or completely exposed systems. Duratherm S is virtually impervious to oxidation at temperatures under 204°C (400°F) and offers superior protection from fluid degradation. Duratherm S is best suited for applications not prone to contamination or leaking.

316°C (600°F) maximum operating temperature
Pumpable down to -50°C (-46°F)
Very strong resistance to oxidation up to 204°C (400°F)
Recommended for use in fully exposed systems like open baths
Highly resistant to fouling for an extremely long service life
Non-corrosive and non-toxic thermal fluid for added workplace safety

TDS
(Technical Data Sheet)

SDS
(Safety Data Sheet)

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Standard

Metric

Temperature Ratings
Max Bulk/Use Temp	316°C
Max Film Temp.	366°C
Pour Point ASTM D97	-66°C

Safety Data
Flash Point ASTM D92	324°C
Fire Point ASTM D92	336°C
Autoignition ASTM E-659-78	437°C

Thermal Properties
Thermal Expansion Coefficient	0.099 %/°C
Thermal Conductivity	W/m·K
38°C	0.133
204°C	0.109
204°C	0.109
260°C	0.100
288°C	0.097
316°C	0.093
Heat Capacity	kJ/kg·K
38°C	1.717
204°C	2.034
204°C	2.035
260°C	2.144
288°C	2.194
316°C	2.248

Physical Properties
Viscosity ASTM D445	cSt
-18°C	113.08
40°C	36.14
100°C	16.57
260°C	5.19
288°C	4.54
316°C	4.03
Density ASTM D1298	kg/l
38°C	0.95
204°C	0.81
204°C	0.81
260°C	0.77
288°C	0.74
316°C	0.72
Vapor Pressure ASTM D2879	kPa
38°C	0.00
204°C	0.14
204°C	0.14
260°C	1.79
288°C	3.52
316°C	6.83
Distillation Range ASTM D2887
10%	494°C
90%	679°C

Note: The values quoted in the table above are typical of normal production.
They do not constitute a specification.

Temperature Ratings
Max Bulk/Use Temp	600°F
Max Film Temp.	690°F
Pour Point ASTM D445	-87°F

Safety Data
Flash Point ASTM D92	615°F
Fire Point ASTM D92	636°F
Autoignition ASTM E-659-78	818°F

Thermal Properties
Thermal Expansion Coefficient	0.055 %/°F
Thermal Conductivity	BTU/hr·ft·F°
100°F	0.077
399°F	0.063
500°F	0.058
550°F	0.056
Heat Capacity	BTU/lb·F°
100°F	0.410
399°F	0.486
500°F	0.512
550°F	0.524

Physical Properties
Viscosity ASTM D445	cSt
40°F	68.40
100°F	37.42
260°F	12.80
Density ASTM D1298	lb/ft³
100°F	59.23
399°F	50.60
500°F	47.88
550°F	46.44
Vapor Pressure ASTM D2879	psia
100°F	0.00
399°F	0.02
500°F	0.26
550°F	0.51
Distillation Range ASTM D2887
10%	922°F
90%	1255°F