Unlike the Turbomolecular Pump the Diffusion Pump recquires a working fluid to move gas molecules. This fluid is commonly reffered to as an oil, due to the fluids resembling oils in feel and consitency. Below is a list of various Diffusion Pump Oils and their physical properties.

Dow Corning

Silicone Oils

Physical Properties
Name	Vapor Pressure	Viscosity 25°C	Boiling Point 0.5 torr	Flashpoint	Condensation Point	Density
DC 702^[1]	1 x 10⁻⁶ Torr ^[1] ^[2]	45 mm²/s ^[1]	180°C ^[1] ^[2]	≥ 193°C ^[1]	°C	1070 kg/m³ ^[1]
DC 703^[2]	1 x 10⁻⁷ Torr ^[2]	mm²/s	200°C ^[2]	°C	°C	1090 kg/m³ ^[2]
DC 704^[3]	2 x 10⁻⁸ Torr	39 mm²/s	215°C	221°C	°C	1070 kg/m³
DC 705^[4]	3 x 10⁻¹⁰ Torr	175 mm²/s	245°C	243°C	°C	1090 kg/m³

Kurk J. Lekser Corporation

Silicone Oils

Physical Properties
Name	Vapor Pressure	Viscosity 25°C	Boiling Point 0.06 torr	Flashpoint	Condensation Point	Density
KJLC 704^[5]	8.4 x 10⁻⁸ Torr	46 mm²/s	223°C	220°C	°C	1100 kg/m³
KJLC 704-T^[6]	8.4 x 10⁻⁸ Torr	37 mm²/s	210°C	220°C	°C	1070 kg/m³
KJLC 705^[7]	3 x 10⁻¹⁰ Torr	165-185 mm²/s	245°C	243°C	°C	1090 kg/m³

VacOil

Silicone Oils

Physical Properties
Name	Vapor Pressure	Viscosity 25°C	Flashpoint	Condensation Point	Density
DP Grade 704^[8]	6.65 x 10⁻⁸ Torr	36 mm²/s ± 4 mm²/s	≥ 210°C	≥ -35°C	1050 ∼ 1080 kg/m³

Leybold

Hydrocarbon Oils

Physical Properties
Name	Vapor Pressure	Viscosity 25°C	Boiling Point 0.06 torr	Flashpoint	Condensation Point	Density
Oil D		mm²/s	°C	°C	°C	kg/m³
Oil E		mm²/s	°C	°C	°C	kg/m³
Diffilen Leicht		mm²/s	°C	°C	°C	kg/m³
Diffilen		mm²/s	°C	°C	°C	kg/m³
Diffilen Extra		mm²/s	°C	°C	°C	kg/m³
Diffilen Ultra		mm²/s	°C	°C	°C	kg/m³
LVO 500^[9]	4 · 10⁻⁹ mBar	mm²/s	°C	> 250 °C	°C	868 kg/m³
LVO 521^[10]	6 · 10⁻⁶ mBar	mm²/s	°C	196 °C	°C	885 kg/m³

Note: Oil D is similar to Apiezon A, and Oil E to Apiezon B. ^[2]

Silicone Oils

Physical Properties
Name	Vapor Pressure	Viscosity 25°C	Boiling Point 0.06 torr	Flashpoint	Condensation Point	Density
LVO 521^[11]	3 · 10⁻¹⁰ mBar	mm²/s	°C	240 °C	°C	1095 kg/m³

Santovac

Polyphenyl Ether Oils

Physical Properties
Name	Vapor Pressure	Viscosity 38°C	Viscosity 90°C	Viscosity 260°C	Boilding Point 0.5 Torr	Flashpoint	Condensation Point	Density
Santovac 5^[12]	4 x 10⁻¹⁰ Torr	363 mm²/s	13.1 mm²/s	1.2 mm²/s	275 °C	288°C		1198 kg/m³

Apiezon

Formerly part of Shell Chemical Co. Ltd.^[2]

Hydrocarbon Oils

Physical Properties
Name	Vapor Pressure	Viscosity 20°C	Viscosity 40°C	Boiling Point (at 10⁻² Torr)	Flashpoint	Pour Point	Density	Molecular Weight
A	2 x 10⁻⁵ Torr^[2]	mm²/s	mm²/s	110°C^[2]	°C	°C	873.5 kg/m³^[2] (at 15°C)	414 Da^[2]
B	4 x 10⁻⁷ Torr^[2]	mm²/s	mm²/s	125°C^[2]	°C	°C	871 kg/m³^[2] (at 15°C)	468 Da^[2]
C	1 x 10⁻⁸ Torr^[2]	mm²/s	mm²/s	°C	°C	°C	kg/m³	574 Da^[2]
G	1 x 10⁻⁶ Torr^[2]	mm²/s	mm²/s	°C	°C	°C	kg/m³
BW	1 x 10⁻⁷ Torr^[2]	mm²/s	mm²/s	°C	°C	°C	kg/m³
AP201^[13]	4 x 10⁻⁶ Torr	76 mm²/s	22 mm²/s	°C	196°C	-30°C	885 kg/m³

Cambridge Mill Products

Silicone Oils

Physical Properties
Name	Vapor Pressure	Viscosity 25°C	Flashpoint	Density
CMP 704^[14]	10⁻⁶ to 10⁻⁸ Torr	mm²/s	221°C	1070 kg/m³

Ideal Vacuum Products

Silicone Oils

Physical Properties
Name	Viscosity 25°C	Boiling Point	Flashpoint	Density
IVP 702^[15]	45 mm²/s	180°C	193°C	1090 kg/m³
IVP 704^[16]	39 mm²/s	215°C	221°C	1065 kg/m³
IVP 705^[17]	175 mm²/s	245°C	243°C	1090 kg/m³

Varian

Polyphenyl Ether Oils

Physical Properties
Name	Vapor Pressure	Viscosity 38°C	Viscosity 90°C	Viscosity 260°C	Boilding Point 0.5 Torr	Flashpoint	pour Point	Density
Neovac SY ^[18]		mm²/s	mm²/s	mm²/s	275 °C	287°C	40°F	1195 - 1201 kg/m³

Concolidated Electrodynamics Corporation

i-diamyl sebacate

Physical Properties
Name	Vapor Pressure	Viscosity 25°C	Boiling Point	Flashpoint	Density	Molecular Weight	Formula
Amoil	1 x 10⁻⁵ torr ^[2]	mm²/s	111°C ^[2]	96°C^[19]	1019 kg/m³ ^[2]	306.2 Da ^[2]	C₆H₄(COOC₅H₁₁)₂ ^[2]
Amoil S	1 x 10⁻⁶ torr ^[2]	mm²/s	111°C ^[2]	118°C^[19]	925.1 kg/m³ ^[2]	343.3 Da ^[2]	C₈H₁₆(COOC₅H₁₁)₂ ^[2]

n-dibutyl phthalate

Physical Properties
Name	Vapor Pressure	Viscosity 25°C	Boiling Point	Flashpoint	Density	Molecular Weight	Formula
Butyl phthalate	3 x 10⁻⁵ torr ^[2]	mm²/s	85°C ^[2]	94°C ^[19]	1046.5 kg/m³ ^[2]	278.1 Da ^[2]	C₆H₄(COOC₄H₉)₂ ^[2]

n-dibutyl Sebacate

Physical Properties
Name	Vapor Pressure	Viscosity 25°C	Boiling Point	Flashpoint	Density	Molecular Weight	Formula
Butyl Sebacate	2 x 10⁻⁵^[19] / 3 x 10⁻⁵ torr ^[2]	mm²/s	90°C ^[2]	103°C^[19]	933 kg/m³ ^[2]	314.3 Da ^[2]	C₈H₁₆(COOC₄H₉)₂ ^[2]

d-2-ethyl hexyl phthalate

Physical Properties
Name	Vapor Pressure	Viscosity 25°C	Boiling Point	Flashpoint	Density	Molecular Weight	Formula
Octoil	3 x 10⁻⁷ torr^[2]	mm²/s	122.5°C^[2]	125°C ^[19]	910.3 kg/m³ ^[2]	390.3 Da^[2]	C₆H₄(COOC₄H₁₇)₂^[2]
Octoil S	3 x 10⁻⁸ torr^[2]	mm²/s	143.5°C^[2]	140°C^[19]	910.3 kg/m³ ^[2]	426.3 Da^[2]	C₈H₁₆(COOC₄H₁₇)₂^[2]

National Researach Corporation

chlorinated diphenyl

Physical Properties
Name	Vapor Pressure	Viscosity 25°C	Boiling Point	Flashpoint	Density	Molecular Weight	Formula
Narcoil 10	3 x 10⁻⁴ torr ^[2]	mm²/s	°C	°C	1540 kg/m³ ^[2]	326 Da ^[2]	C₈H₁₆(COOC₄H₉)₂ ^[2]

d-2-ethyl hexyl phthalate

Physical Properties
Name	Vapor Pressure	Viscosity 25°C	Boiling Point	Flashpoint	Density	Molecular Weight	Formula
Narcoil 20	3 x 10⁻⁸ torr^[2]	mm²/s	143.5°C^[2]	°C	910.3 kg/m³ ^[2]	426.3 Da^[2]	C₈H₁₆(COOC₄H₁₇)₂^[2]
Narcoil 40	3 x 10⁻⁷ torr^[2]	mm²/s	122.5°C^[2]	°C	910.3 kg/m³ ^[2]	390.3 Da^[2]	C₆H₄(COOC₄H₁₇)₂^[2]

Vacuum Industrial Applications Ltd.

chlorinated diphenyl

Physical Properties
Name	Vapor Pressure	Viscosity 25°C	Boiling Point	Flashpoint	Density	Molecular Weight	Formula
Viacoil 10	3 x 10⁻⁴ torr ^[2]	mm²/s	°C	°C	1540 kg/m³ ^[2]	326 Da ^[2]	C₈H₁₆(COOC₄H₉)₂ ^[2]

d-2-ethyl hexyl phthalate

Physical Properties
Name	Vapor Pressure	Viscosity 25°C	Boiling Point	Flashpoint	Density	Molecular Weight	Formula
Viacoil 20	3 x 10⁻⁸ torr^[2]	mm²/s	143.5°C^[2]	°C	910.3 kg/m³ ^[2]	426.3 Da^[2]	C₈H₁₆(COOC₄H₁₇)₂^[2]
Viacoil 40	3 x 10⁻⁷ torr^[2]	mm²/s	122.5°C^[2]	°C	910.3 kg/m³ ^[2]	390.3 Da^[2]	C₆H₄(COOC₄H₁₇)₂^[2]

Litton Engineering Labs.

Naphthene Oils

Physical Properties
Name	Vapor Pressure	Viscosity 25°C	Boiling Point	Flashpoint	Density	Molecular Weight	Formula
Molecular Lubricant A	1 x 10⁻⁶ torr ^[19]	mm²/s	°C	°C	873.5 kg/m³^[19]	Da
Molecular Lubricant B	1 x 10⁻⁷ torr ^[19]	mm²/s	°C	°C	871 kg/m³^[19]	Da

Unknown Maker

Physical Properties
Name	Vapor Pressure	Viscosity 25°C	Boiling Point	Flashpoint	Density	Molecular Weight	Formula
Myvane 20	torr	mm²/s	°C	°C	853 kg/m³ ^[2]	Da

References

↑ ^1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 Kurt J. Lesker Specifications Table DC702
↑ ^2.00 ^2.01 ^2.02 ^2.03 ^2.04 ^2.05 ^2.06 ^2.07 ^2.08 ^2.09 ^2.10 ^2.11 ^2.12 ^2.13 ^2.14 ^2.15 ^2.16 ^2.17 ^2.18 ^2.19 ^2.20 ^2.21 ^2.22 ^2.23 ^2.24 ^2.25 ^2.26 ^2.27 ^2.28 ^2.29 ^2.30 ^2.31 ^2.32 ^2.33 ^2.34 ^2.35 ^2.36 ^2.37 ^2.38 ^2.39 ^2.40 ^2.41 ^2.42 ^2.43 ^2.44 ^2.45 ^2.46 ^2.47 ^2.48 ^2.49 ^2.50 ^2.51 ^2.52 ^2.53 ^2.54 ^2.55 ^2.56 ^2.57 ^2.58 ^2.59 ^2.60 ^2.61 ^2.62 ^2.63 ^2.64 ^2.65 ^2.66 ^2.67 ^2.68 ^2.69 ^2.70 ^2.71 ^2.72 ^2.73 ^2.74 ^2.75 ^2.76 ^2.77 ^2.78 M. Pirani & J. Yarwood, Principles of Vacuum Engineering, (London: Chapman and Hall, 1961), Page 61 Table 2.2
↑ Kurt J. Lesker Specifications Table DC704
↑ Kurt J. Lesker Specifications Table DC705
↑ Kurt J. Lesker Specifications Table KJLC 704 & KJLC 704-T & KJLC 705
↑ Kurt J. Lesker Specifications Table KJLC 704 & KJLC 704-T & KJLC 705
↑ Kurt J. Lesker Specifications Table KJLC 704 & KJLC 704-T & KJLC 705
↑ VacOil® DP Grade 704 Diffusion Pump Oil - 500 cc/ml Specifications
↑ Fette Triebmittel Katalog Leybold S24
↑ Fette Triebmittel Katalog Leybold S24
↑ Fette Triebmittel Katalog Leybold S24
↑ Santovac 5(P) - Diffusion Pump Oil & Ultra Polyphenyl Ether Pump Fluid Specifications Table
↑ ApiezonAP201 DataSheet 1a Page 4
↑ Cambridge CMP 704 Silicone Diffusion Pump Fluid MSDS.pdf
↑ IVP 702 Diffusion Pump Oil SDS
↑ IVP 704 Diffusion Pump Oil SDS
↑ IVP 705 Diffusion Pump Oil SDS.pdf
↑ Santovac 5 Polyphenyl Ether Lubricant Diffusion Pump Oil SDS.pdf
↑ ^19.00 ^19.01 ^19.02 ^19.03 ^19.04 ^19.05 ^19.06 ^19.07 ^19.08 ^19.09 ^19.10 L. H. Martin & R.D. Hill, A Manual of Vacuum Practice, (Melbourne University Press, 1947), Page 96

[DC_DC702-1] 1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 Kurt J. Lesker Specifications Table DC702

[Pirani_1961-2] 2.00 ^2.01 ^2.02 ^2.03 ^2.04 ^2.05 ^2.06 ^2.07 ^2.08 ^2.09 ^2.10 ^2.11 ^2.12 ^2.13 ^2.14 ^2.15 ^2.16 ^2.17 ^2.18 ^2.19 ^2.20 ^2.21 ^2.22 ^2.23 ^2.24 ^2.25 ^2.26 ^2.27 ^2.28 ^2.29 ^2.30 ^2.31 ^2.32 ^2.33 ^2.34 ^2.35 ^2.36 ^2.37 ^2.38 ^2.39 ^2.40 ^2.41 ^2.42 ^2.43 ^2.44 ^2.45 ^2.46 ^2.47 ^2.48 ^2.49 ^2.50 ^2.51 ^2.52 ^2.53 ^2.54 ^2.55 ^2.56 ^2.57 ^2.58 ^2.59 ^2.60 ^2.61 ^2.62 ^2.63 ^2.64 ^2.65 ^2.66 ^2.67 ^2.68 ^2.69 ^2.70 ^2.71 ^2.72 ^2.73 ^2.74 ^2.75 ^2.76 ^2.77 ^2.78 M. Pirani & J. Yarwood, Principles of Vacuum Engineering, (London: Chapman and Hall, 1961), Page 61 Table 2.2

[3] Kurt J. Lesker Specifications Table DC704

[4] Kurt J. Lesker Specifications Table DC705

[5] Kurt J. Lesker Specifications Table KJLC 704 & KJLC 704-T & KJLC 705

[6] Kurt J. Lesker Specifications Table KJLC 704 & KJLC 704-T & KJLC 705

[7] Kurt J. Lesker Specifications Table KJLC 704 & KJLC 704-T & KJLC 705

[8] VacOil® DP Grade 704 Diffusion Pump Oil - 500 cc/ml Specifications

[9] Fette Triebmittel Katalog Leybold S24

[10] Fette Triebmittel Katalog Leybold S24

[11] Fette Triebmittel Katalog Leybold S24

[12] Santovac 5(P) - Diffusion Pump Oil & Ultra Polyphenyl Ether Pump Fluid Specifications Table

[13] ApiezonAP201 DataSheet 1a Page 4

[14] Cambridge CMP 704 Silicone Diffusion Pump Fluid MSDS.pdf

[15] IVP 702 Diffusion Pump Oil SDS

[16] IVP 704 Diffusion Pump Oil SDS

[17] IVP 705 Diffusion Pump Oil SDS.pdf

[18] Santovac 5 Polyphenyl Ether Lubricant Diffusion Pump Oil SDS.pdf

[Martin_1947-19] 19.00 ^19.01 ^19.02 ^19.03 ^19.04 ^19.05 ^19.06 ^19.07 ^19.08 ^19.09 ^19.10 L. H. Martin & R.D. Hill, A Manual of Vacuum Practice, (Melbourne University Press, 1947), Page 96

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Diffusion Pump Oil Cross-Reference

Contents

Dow Corning

Silicone Oils

Kurk J. Lekser Corporation

Silicone Oils

VacOil

Silicone Oils

Leybold

Hydrocarbon Oils

Silicone Oils

Santovac

Polyphenyl Ether Oils

Apiezon

Hydrocarbon Oils

Cambridge Mill Products

Silicone Oils

Ideal Vacuum Products

Silicone Oils

Varian

Polyphenyl Ether Oils

Concolidated Electrodynamics Corporation

i-diamyl sebacate

n-dibutyl phthalate

n-dibutyl Sebacate

d-2-ethyl hexyl phthalate

National Researach Corporation

chlorinated diphenyl

d-2-ethyl hexyl phthalate

Vacuum Industrial Applications Ltd.

chlorinated diphenyl

d-2-ethyl hexyl phthalate

Litton Engineering Labs.

Naphthene Oils

Unknown Maker

References

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