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Shandong Bozhong Vacuum Equipment Co., Ltd.

Add:No.37 Bozhong Road,Ma Shang Town,Zhang Dian District,Zibo City,Shandong Province

Tel:+86-533-2530388
         +86-533-2530311
      +86-533-2802841

Fax:+86-0533-2530399

Internet fax:400-8266163-04400

Your position:Technical

Vacuum data and unit conversion

1. Vacuum region division

2. Length: Metric - Inch conversion table

3. Weight: kg - pound - Oz conversion table

4. All kinds of vacuum gauge and gauge conversion table

5. Absolute temperature, Celsius, Fahrenheit temperature control table

6. Suction rate unit conversion table

7. Resistivity of all kinds of water (Ohm)

8. Air molecular mean free path under different pressures at 20℃

9. Commonly used pressure unit conversion table

10. Air molecular density under different pressure

11. Main performance of vacuum grease

12. Conversion of force units

13. Power unit conversion

14. Vacuum sealing paste characteristics

15. Various rubber characteristics table

16. Area unit conversion

17. Volume unit conversion

18. Main performance indexes of oil in No.1 vacuum mechanical pump

19. Oil performance indicators of domestic diffusion pumps

20. Type and work scope of vacuum pump

21. Saturation vapor pressure of water at different temperatures

22. Some materials’ melting points, melting heat, boiling and heat of vaporization

 

 

1,Vacuum region division

 

Vacuum region

Pressure range

Torr

Pa

Low vacuum

760~10

101325~1333

Medium vacuum

10~10-3

1333~1.33×10-1

High vacuum

10-3~10-8

1.33×10-1~10-6

Ultra high vacuum

10-8~10-12

10-6~10-10

Very high vacuum

<10-12

<10-10

 

2,Length: Metric - Inch table

 

Unit

m

ft

in

1m

1

3.28

39.37

1ft

0.305

1

8.33

1 inch

0.0254

12

1

 

3,Weight: kg - pound - oz conversion table

 

Unit

kg

lb

oz

1 kg

1

2.2

35.27

1 pound

0.45

1

16

1 oz

0.03

0.06

1

 

4,A variety of vacuum gauges and gauge conversion table

 

Vacuum gauge name

Resistance vacuum gauge

Thermocouple vacuum gauge

1.Hot cathode ionization vacuum gauge
2.Pressure automation control instrument

Cold cathode collision
control vacuum gauge

Medium vacuum gauge

Ultra high vacuum gauge

Name of gauge

Resistance gauge

Thermocouple gauge

Ionization gauge

Cold cathode gauge

Middle vacuum gauge

B-A gauge

Gauge model

ZJ-52T

ZJ-51(DL-3)
ZJ-53

ZJ-27(DL-9)
ZJ-2(DL-2)
ZJ-10(DL-5)

M014

DL-5
DL-8

ZJ-32
ZJ-32BC
ZJ-12

 

5,Absolute temperature, Celsius, Fahrenheit temperature conversion table

 

Temperature form

K(Absolute temperature)

°F

K

1

℃+273.15

5/9(°F+459.67)

K-273.15

1

5/9(°F-32)

°F

9/5(K-459.67)

9/5(℃+32)

1

 

6,Suction ration unit conversion table

 

Unit

m3/s(m3/s)

L/S(L/s)

m3/h

Inch3/min

11m3/s(1m3/s)

1

1000

3600

2118.88

1L/s(1L/s)

10-3

1

3.6

2.119

11m3/h(1m3/h)

2.78×10-4

0.278

1

0.59

1cft/min(1cft/min)

4.72×10-4

0.47

1.69

1

 

7,Resistivity of all kinds of water (Ohm)

 

Water

Seawater

Poor quality tap water

High quality tap water

Distilled water

Super clean water

Resistivity

10~10-2

103

104~105

106

107~108

 

8,Air Molecular mean free path under different pressures at 20℃

 

P(Torr)

1

10-3

10-4

10-5

10-6

10-9

λ(cm)  

4.72×10-3

4.72

47.2

472

4720

4.72×106

 

9,Commonly used pressure unit conversion table

 

 
Pa
Pa
Torr
Torr
μmHg
μmHg
μbar
μbar
mbar
mbar
atm
atm
am
am
inHg
inHg
lb/in2
lb/in2
1 Pa
1
7.5
×10-3
7.5
10
10-2

9.86923
×10-6

1.0197
×105
2.953
×10-4
1.450
×10-4
1 Torr
133.32
1
103
1333.2
1.3332
1.31579
×10-3
1.3595
×10-3
3.937
×10-2
1.934
×10-2
1 μmHg
0.13332
10-3
1
1.3332
1.3332
×10-3
1.31579
×10-6
1.3595
×10-6
3.937
×10-5
1.934
×10-5
1 μbar
10-1
7.5
×10-4
7.5
×10-1
1
10-3
9.86923
×10-7
1.0197
×10-6
2.953
×10-5
1.450
×10-5
1 mbar
102

7.5
×10-1

7.5
×102
103
1
9.86923
×10-4
1.0197
×10-3
2.953
×10-2
1.450
×10-2
1 atm
101325
760
760×103
1013.25
×103
1013.25
1
1.0333
29.921
14.696
1 am
98066.3
735.56
735.56
×103
980663
980663
×10-3
0.967839
1
28.959
14.223
1 inHg
3386
25.4
25.4×103
3.386×104
33.86
3.342
×10-2
3.453
×10-2
1
4.912
×10-1
1 lb/in2
6895
51.715
51.715
×103
6.895×104
68.95
6.805
×10-2
7.031
×10-2
2.086
1

 

10,Molecular density of air under different pressure

 

P(Torr)

1

10-3

10-4

10-5

10-6

10-9

n0(piece/cm3)

4×1016

4×1013

4×1012

4×1011

4×1010

4×107

 

11,Main properties of vacuum grease

 

Name   

Composition  

Saturated vapor pressure (Torr) at 20 ℃

Maximum use temperature (℃)

2#

Polymer carbon  

3.1×10-8

30

3#

Oxygen compounds  

10-9

35

4#

Soap grease  

10-7~10-8

130

7501

Silicone oil plus of silica powder  

10-6The following  

-40~+200

 

12,Conversion of force Unit

 

Dyn(Dyn)

N(N)

 

sthene
kgf(kgf)
1
10-5
10-8
1.02×10-6

 

13,Conversion of power unit

 

Unit
Horsepower
KW
W
PS(PS)
1
0.735
735
kw(kW)
1.36
1
1000
w(W)
0.00136
0.001
1

 

14,Vacuum sealing grease characteristic

 

Vacuum sealing grease name

Vacuum
vacuum cement
50#
80#
30#
Temperature
50℃
80℃
30℃
 
10-7~10-8Torr
10-7~10-8Torr
5×10-4Torr

 

15,Characteristic table of various rubber

 

Types of rubber

Natural rubber
Butyl rubber
Nitrile rubbe
Fluorine rubber
Characteristic1
Water resistance, acid resistance, good alkali resistance
Small permeability
Good oil resistance
23-type resistance to strong acid
Characteristic2
A large amount of discharging gas
Severe sublimation
Better elasticity
26-type has low permeability and small discharging gas rate
Vacuum range
1×10-5Torr
10-7Torr
10-8Torr
10-8Torr
temperature
-30~80℃
-30~150℃
-30~120℃
-20~200℃

 

16,Area Unit conversion

 

m2(m2)

cm2(cm2)

mm2(mm2)

sc2(sc2)

ft2(ft2)

in2(in2)

1

10000

1000000

9

10.7639

1550

 

17,Volume Unit conversion

 

m3  

L  

Cubic Shichi  

British gallon  

American gallon (liquid)

Cubic feet  

Cubic inch   

日升Sunrise

1

1000

27

219.98

264.18

35.3147

0.06103

554.37

 

18,The main performance indexes of oil in NO.1 vacuum mechanical pump

 

Item   

Kinematic viscosity (CPS)

Flash point (℃)

Saturated vapor pressure at 20℃(Torr)   

Specific gravity (g / cm 3))

Molecular weight (g)

KK-1

50℃(47~57)
100℃(8~11)

Not less than15

Not higher than4×10-5

0.86

333

 

19,Performance indexes of oil in domestic diffusion pump

Grade

1#

2#

3#

274silicone oil

275silicone oil

Saturated vapor pressure (Torr) at20℃not greater than

4×10-8

2×10-8

2×10-8

2×10-8

1.7×10-8

Kinematic viscosity (CPS)

45~60

55~65

68~80

38±3

165±20

Freezing point (℃) not higher than

-15

-15

-15

-10

-14~-18

Flash point (℃) not less than

230

230

230

>210

>243

Specific gravity (g / cm 2)

     

1.05~1.08

1.09±0.02

 

 

 

20,Types of vacuum pumps and their working range

 

Vacuum pump

Working range (Torr)

 

Vacuum pump

Working range (Torr)

Rotary vane vacuum pump

760~5×10-4

Reciprocating vacuum pump

760~10-2

Rotary plunger vacuum pump

760~5×10-3  

Adsorption pump

760~10-4

Oil booster pump

10-1~10-4

Sputter ion pump

10-4~10-10

Roots vacuum pump

10-1~10-4  

Titanium sublimation pump

10-3~10-10

Oil diffusion pump

10-3~5×10-7  

Molecular pump

10-3~10-10

Water ring vacuum pump

760~25

Low temperature pump

10-3~10-10

 

21,Saturated vapor pressure of water at various temperatures

Temperature

Vapor pressure mmHg

Temperature

Vapor pressure mmHg

Temperature

Vapor pressure mmHg

Temperature

Vapor pressure mmHg

Temperature

Vapor pressure mmHg

-20

0.772

5

6.54

30

31.82

55

118.0

80

355.1

-19

0.85

6

7.01

31

33.70

56

123.8

81

369.7

-18

0.935

7

7.51

32

35.66

57

129.8

82

384.9

-17

1.027

8

8.05

33

37.73

58

136.1

83

400.6

-16

1.128

9

8.61

34

39.90

59

142.6

84

416.8

-15

1.238

10

9.21

35

42.18

60

149.4

85

433.6

-14

1.357

11

9.84

36

44.56

61

156.4

86

450.9

-13

1.486

12

10.52

37

47.07

62

163.8

87

468.7

-12

1.627

13

11.23

38

49.65

63

171.4

88

487.1

-11

1.780

14

11.99

39

52.44

64

179.3

89

506.1

-10

1.946

15

12.79

40

55.32

65

187.5

90

525.8

-9

2.215

16

13.63

41

58.34

66

196.1

91

546.1

-8

2.321

17

14.53

42

61.50

67

205.0

92

567.0

-7

2.532

18

15.48

43

64.80

68

214.2

93

588.6

-6

2.761

19

16.48

44

68.26

69

223.7

94

610.9

-5

3.008

20

17.54

45

71.88

70

233.7

95

633.9

-4

3.276

21

18.65

46

75.65

71

243.9

96

657.6

-3

3.566

22

19.83

47

79.60

72

254.6

97

682.1

-2

3.879

23

21.07

48

83.71

73

265.7

98

707.3

-1

4.216

24

22.38

49

88.02

74

277.2

99

733.2

0

4.579

25

23.76

50

92.51

75

289.1

100

760.0

1

4.930

26

25.21

51

97.20

76

301.4

 

 

2

5.290

27

26.74

52

102.1

77

314.1

 

 

3

5.690

28

28.35

53

107.2

78

327.3

 

 

4

6.10

29

30.04

54

112.5

79

341.0

 

 


22,Some of the material melting point, melting heat, boiling and heat of vaporization

Material
Melting
(℃)
Heat of fusion
(Cal/g)
Boiling
(℃)
Vaporization
(Cal/g)
Alcohol
-114
23.54
78
204
Carbon disulfide
-112
45.3
46.25
84
Ammonia
-77.7
81.3
-33
327
Turpentine
-10
80
160
-
Ice
0
80
100
539
Naphthalene
80
33
218
50.5
Pig iron
1100~1200
8
2450
93
Carbon monoxide
-200
46.68
-190
263
Acetic acid
16.6
16.4
118.3
104
Methanol
-97.1
20.95
64.7
94
Aniline
-6.24
30.24
184.3
124
Benzene
5.48
82.2
Acetone
-96.5
56.1