Welcome to Polar Cryogenics

Cylinder Specifications

Letter Code Approximate
Cylinder Dimensions
Diameter x Height in Inches* Average Tare
Weight (lbs.) Approximate
Internal Volume
Cubic Feet

High Pressure Steel Cylinders

H2 10 x 51 300 1.49

J 9 x 55 137 1.76

H 9 x 51 116 1.55

H1 9 x 51 188 1.53

Q2 9 x 26 62 0.59

M 7 x 43 61 0.78

Q 7 x 32 53 0.57

F 7 x 30 47 0.51

G3 6 x 21 24 0.28

E 4 x 26 13 0.17

D 4 x 17 9 0.10

DB 4 x 17 9 0.10

LB 2 x 13 4 0.02

RB 2 x 13 4 0.02

High Pressure Aluminum Cylinders

AH 8 x 48 48 1.04

A2 7 x 33 30 0.56

A3 7 x 16 15 0.21

Low Pressure Steel Cylinders

AC 16 x 54 197 4.46

PC 15 x 42 90 3.83

CL 10 x 48 85 1.93

SC 10 x 47 47 2.31

RC 7 x 20 26 0.35

Acetylene Cylinders

L5 12 x 36 146 1.91

S3 8 x 30 71 0.88

S2 6 x 20 24 0.28

*Heights do not include valves or caps.

HIGH PRESSURE STEEL CYLINDERS

ALUMINUM CYLINDERS

LOW PRESSURE STEEL CYLINDERS

Pure Gases CGA Selection Chart For Fittings

CGA Fittings Required Pure Gases

510/300 Acetylene

590/346/677 Air

240/660/705 Ammonia

580/677 Argon

350 *Arsine

320 Carbon Dioxide

350 Carbon Monoxide

660/728 Chlorine

510 Cyclopropane

350 Deuterium

350 Ethane

350 Ethylene

510 Ethylene Oxide

580/677 Helium

350 Hydrogen

330 Hydrogen Chloride

330 *Hydrogen Sulfide

580 Krypton, KR-85

350 Methane

510 Methyl Chloride

580 Neon

580/677 Nitrogen

326 Nitrous Oxide

540 *Oxygen

350 *Phosphine

510 Propane

350 *Silane

668/660 Sulfur Dioxide

590 Sulfur Hexaflouride

580 Xenon

* It is recommended that the user be thoroughly familiar with the specific properties of these gases. The Compressed Gas Association (CGA) has selected and standardized the valve outlet to be used on each cylinder. These standards, contained in the document “CGA STANDARD V-1, Compressed Gas Cylinder Valve Outlet and Inlet Connections,” have been adopted to prevent the inadvertent mixing of gases which could be reactive, and to avoid other possible equipment misuse hazards.
The above chart may be used for guide purposes only. Consult your gas supplier to determine the actual CGA connection required when ordering a regulator.

CGA Fittings Required Mixed Gases

Minor Component(s)

in Major Component

240/660/705 Ammonia Nitrogen

350 Butane Nitrogen

296 Carbon Dioxide Oxygen

580 Carbon Dioxide Helium or Nitrogen

580 Carbon Dioxide and/or Nitrogen Helium

330 Chlorine Nitrogen

350 Diborane Argon, Helium Hydrogen or Nitrogen

580 Freon-12 Nitrogen

296 Helium Oxygen

350 Hexane Nitrogen

350 Isobutane Nitrogen

350 Krypton-85 Carbon Monoxide, Hydrogen or Methane

330 Krypton-85 Chlorine

540 Krypton-85 Oxygen

580 Moisture Argon, Helium or Nitrogen

660 Nitric Oxide Nitrogen

660 Nitrogen Dioxide Air or Nitrogen

590 Nitrous Oxide Nitrogen

590 Oxygen Nitrogen or Helium

350 Propane* Helium or Nitrogen

660 Sulfur Dioxide Air or Nitrogen

590 Sulfur Hexaflouride Air

580 Sulfur Hexaflouride Hydrogen

350 Sulfur Hexaflouride Hydrogen

350 Tritium Argon, Carbon Dioxide, Carbon Monoxide, Helium, Hydrogen, Methane, Neon, Nitrogen, Krypton or Xenon

* Exceptions: Flammables in Air or Oxidizers
* Propane in air: Methane in air: Carbon Monoxide in air = 590.
Since the combined characterisitics of a mixture of gases often differ from the properties of the separate components, different CGA connections are often required.

The chart above can be used as a reference for the CGA connections.

Mixtures which use the same CGA connection as if the minor component were in its pure gas form have not been included for the sake of brevity. The proper fitting for these mixtures can be determined by looking up the minor component on the chart for pure gases.

CGA Connections

CGA 110
.375-18NGT RH-ING
CGA 165
4375-20UNF-2A-RH-EXT
(1/4-in. SAE Flare)
CGA 180
.625-18UNF 2A-RH-EXT

CGA 240
.375-18NGT RH-ING
CGA 280
.745-14UGO RH-EXT
CGA 290
.745-14NGO LH-EXT

CGA 295
.750-16UNF-2A-RH-EXT
(1/2 in. SAE Flare)
CGA 296
.803-14UNS-2B-RH-INT
CGA 320
.825-14NGO-RH-EXT
(Flat Nipple)

CGA 326
.825-14NGO RH-EXT
CGA 330
.825-14NGO-LH-EXT
(Flat Nipple)
CGA 346
.825-14NGO-RH-EXT
(Large Round Nipples)

CGA 347
.825-14NGO-RH-EXT
(Large Round Nipples)
CGA 350
.825-14NGO-LH-EXT
(Round Nipples)
CGA 440
.875-14UNF-2A-RH-EXT
(5/8-in. SAE Flare)

CGA 500
.885-14NGO-RH-INT
(Bullet Nipple)
CGA 510
.885-14NGO-LH-INT
(Bullet Nipple)
CGA 540
.903-14NGO-RH-EXT

CGA 555
.903-14NGO LH-EXT
CGA 580
.965-14NGO-RH-INT
CGA 590
.965-14NGO-LH-INT

CGA 660
1.030-14NGO-RH-EXT
(Face Washer)
CGA 670
1.030-14NGO-LH-EXT
(Face Washer)
CGA 677
1.030-14NGO-LH-EXT
(Round Nipple)

CGA 678
1.030-14NGO-LH-LH-EXT
(Recessed Nipple)
CGA 679
1.030-14NGO-LH-EXT
(Tipped Nipple)
CGA 680
1.045-14NGO-RH-INT

CGA 695
1.045-14NGO-LH-INT
CGA 701
1.103-14NGO-RH-EXT
CGA 702
1.125-14NGO-RH-INT

CGA 703
1.125-14NGO-LH-INT
CGA 705
1.125-14UNS-2A-RH-EXT
CGA 792
1.500-12UNF-2A-RH-EXT

CGA 870
PIN-INDEXED YOKE, PINS 2-5

CGA 880
PIN-INDEXED YOKE, PINS 2-6

CGA 890
PIN-INDEXED YOKE, PINS 2-4

CGA 900
PIN-INDEXED YOKE, PINS 1-3

CGA 910
PIN-INDEXED YOKE, PINS 3-5

CGA 920
PIN-INDEXED YOKE, PINS 3-6

CGA 930
PIN-INDEXED YOKE, PINS 4-6

CGA 940
PIN-INDEXED YOKE, PINS 1-6

CGA 950
PIN-INDEXED YOKE, PINS 1-5

CGA 960
PIN-INDEXED YOKE, PINS 1-4

CGA 965
PIN-INDEXED YOKE, PIN NO. 7

CGA 973
PIN-INDEXED YOKE, PINS 11-24

Gas Materials Compatability Guide

It is extremely important that a gas be compatible with the equipment through which it will pass. A device incompatible with the gas being used could result in damage to the unit and may cause a leak which could result in damage to property or personal injury. To minimize the risk of potentially dangerous circumstances, be certain to check for compatibility of materials prior to using any gases in your gas control equipment.

Prior to using a gas mixture or gas that is not listed in the Gas Compatibility Guide, it is strongly recommended that you contact Polar Cryogenics for information.

Conversion Factors

DENSITY TO OBTAIN

gms/cm³ kg/m³ lbs/ft³ lbs/in³ lbs/U.S. gal

MULTIPLY BY

gms/cm³ – 1000 62.428 0.0361273 8.3454

kg/m³ 0.001 – 0.062428 3.61273 x 10^-5 0.0083454

lbs/ft³ 0.0160185 16.018463 – 5.78704 x 10^-4 0.13368

lbs/in³ 27.679905 27,679.9 1728 – 231

lbs/U.S. gal 0.1198264 119.8264 7.4805195 0.004329 –

TEMPERATURE TO OBTAIN

°C °F °K °R

MULTIPLY BY

°C + 17.78 – 1.8 – –

°C + 273.16 – – 1 –

°F - 32 5/9 – – –

°F + 459.72 – – – 1

°K - 273.16 1 – – –

°R - 459.72 – 1 – –

LENGTH TO OBTAIN

A cm ft in m micron mm yd

MULTIPLY BY

A – 1 x 10^-8 3.2808399 x 10^-10 3.937008 x 10^-9 1 x 10^-10 0.0001 0.0000001 1.0936133 x 10^-10

cm 1 x 10⁸ – 0.0328084 0.393708 0.01 10,000 10 0.0109361

ft 3.048 x 10⁹ 30.48 – 12 0.3048 304,800 304.8 0.3333333

in 2.54 x 108 2.54 0.0833333 – 0.0254 25,4000 25.4 0.0277778

m 1 x 10¹⁰ 100 3.2808399 39.3700787 – 1,000,000 1000 1.0936133

micron 10,000 0.0001 3.2808399 x 10^-6 3.9370079 x 10^-5 0.0000010 – 0.001 1.0936133 x 10^-6

mm 10,000,000 0.1 0.0032084 0.03937008 0.001 1,000 – 0.0010936

yd 9.144 x 10⁹ 91.44 3 36 0.9144 914,400 914.4 –

FLOW TO OBTAIN

cm³/min cm³/sec ft³/hr ft³/min m³/hr m³/min L/hr Lpm

MULTIPLY BY

cm³/min – 0.0166667 0.0021189 0.0000353 0.00006 0.000001 0.06 0.001

cm³/sec 60 – 0.1271340 0.0021189 0.0036 0.00006 3.6 0.06

ft³/hr 471.9474 7.865790 – 0.0166667 0.0283168 0.0004719 28.31685 0.47195474

ft³/min 28,316.85 471.9474 60 – 1.699008 0.02833168 1699.008 28.31685

m³/hr 16,666.67 277.7778 35.31467 0.5885777 – 0.0166667 1000 16.66667

m³/min 1,000,000 16,666.67 2118.876 35.31467 60 – 60,000 1000

L/hr 16.66667 0.2777778 0.0353147 0.0005885 0.001 0.0000167 – 0.0166667

Lpm 1000 16.66667 2.118876 0.0353147 0.06 0.001 60 –

WEIGHT TO OBTAIN

gms kg mg oz* lbs* tons
(short, U.S.)

MULTIPLY BY

gms – 0.001 1000 0.0352740 0.0022046 1.102 x 10^-6

kg 1000 – 1,000,000 35.273962 2.2046226 0.0011023

mg 0.001 0.000001 – 3.5274 x 10^-5 2.2046 x 10^-6 1.012 x 10^-9

oz* 28.34952 0.0283495 28,349.5 – 0.0625 3.125 x 10^-5

lbs* 453.59237 0.4535924 453,592 16 – 0.0005

tons
(short, U.S.) 907,185 907.18474 9.07185 x 10⁸ 32,000 2000 –

*avoirdupois

PRESSURE TO OBTAIN

atm bars ft of H₂0
at 60°F in of Hg
at 0°C in of H₂0
at 60°F kg/cm² kpa MM of Hg
at 0°C(torr) psi

MULTIPLY BY

atm – 1.01325 33.932 29.921 407.1827 1.0332 101.3171 760 14.696

bars .98692 – 33.4883 29.530 401.8596 1.019716 100 750.062 14.50368

ft of H₂0
at 60°F 0.02947 0.029891 – 0882646 12 0.03048 2.9890 22.4198 0.433107

in of Hg
at 0°C 0.03342 0.033864 1.1340 – 13.6 0.034532 3.376895 25.4 0.49115

in of H₂0
at 60°F 0.00246 0.002499 0.083333 0.073556 – 0.00254 0.0249089 1.86832 0.03609

kg/cm² 0.96787 0.980665 32.8084 28.95903 393.7008 – 98.03922 735.5592 14.22334

kpa 0.00987 0.010 0.33456 0.29613 4.01472 0.01020 – 7.5006 0.14504

mm of Hg
at 0°C(torr) 0.00132 0.001333 0.044603 0.03937 0.535240 0.001360 0.133322 – 0.019337

psi 0.06805 0.068948 2.3089 2.0360 27.70851 0.07307 6.89465 51.715 –

CONCENTRATION EQUIVALENTS

1,000,000 ppm 100%

100,000 ppm 10.0%

10,000 ppm 1.0%

1,000 ppm 0.1%

100 ppm 0.01%

10 ppm 0.001%

1 ppm 0.0001%

1,000 ppb 1 ppm

100 ppb 0.1 ppm

10 ppb 0.01 ppm

1 ppb 0.001 ppm

EXPONENTIAL EQUIVALENTS

SCIENTIFIC
NOTATION EQUIVALENT SCIENTIFIC
NOTATION EQUIVALENT

1 X 10¹⁰ 10,000,000,000 1 x 10^-1 0.1

1 X 10⁹ 1,000,000,000 1 x 10^-2 0.01

1 X 10⁸ 100,000,000 1 x 10^-3 0.001

1 X 10⁷ 10,000,000 1 x 10^-4 0.0001

1 X 10⁶ 1,000,000 1 x 10^-5 0.00001

1 X 10⁵ 100,000 1 x 10^-6 0.000001

1 X 10⁴ 10,000 1 x 10^-7 0.0000001

1 X 10³ 1,000 1 x 10^-8 0.00000001

1 X 10² 100 1 x 10^-9 0.000000001

1 X 10¹ 10 1 x 10^-10 0.0000000001

MISCELLANEOUS PHYSICAL CONSTANTS

NUMBERICAL VALUE UNITS

Avogardo's Number 6.022045 x 10²³ Molecules/gm-mole

Gas-Law Constant R 1.98719 cal/ (gm-mole) (°K)

1.98719 Btu/ (lb-mole) (°R)

82.0568 (cm³) (atm) (gm-mole) (°K)

0.0820568 (liter) (atm)/(gm-mole) (°K)

10.7314 (ft³) (lb)/(in²)(lb-mole) (°R)

0.730228 (ft³) (atm)/(lb-mole) (°R)

VOLUME TO OBTAIN

cm³* ft³ in³ m³ gas
(U.S. liquid) L

MULTIPLY BY

cm³* – 0.00003531 0.0610237 0.000001 0.00025641 0.001

ft³ 28,316.847 – 1728 0.02831685 7.480519 28.316847

in³ 16.387064 0.0005787 – 0.00001637 0.0043290 0.0163871

m³ 1,000,000 35.31467 61,203.74 – 264.172 1000

gal (U.S. liquid) 3785.412 0.13368056 231 0.00378541 – 3.785412

L 1000 0.3531467 61.023754 0.001 0.2641721 –

*1 cm³ = 1 ml

DEW POINT TO PPM CONVERSIONS TO OBTAIN

Dew
Point
(°F) Water Vapor
ppm
(vol/vol) Dew
Point
(°F) Water Vapor
ppm
(vol/vol) Dew
Point
(°F) Water Vapor
ppm
(vol/vol) Dew
Point
(°F) Water Vapor
ppm
(vol/vol)

-130 .10 -81 7.2 -54 51 -27 283

-120 0.25 -80 7.8 -53 55 -26 300

-110 0.63 -79 8.4 -52 59 -25 317

-105 1.00 -78 9.1 -51 62 -24 338

-104 1.08 -77 9.8 -50 67 -23 358

-103 1.18 -76 10.5 -49 72 -22 378

-102 1.29 -75 11.4 -48 76 -21 400

-101 1.40 -74 12.3 -47 82 -20 422

-100 1.53 -73 13.3 -46 87 -19 448

-99 1.66 -72 14.3 -45 92 -18 475

-98 1.81 -71 15.4 -44 98 -17 500

-97 1.96 -70 16.6 -43 105 -16 530

-96 2.15 -69 17.9 -42 113 -15 560

-95 2.35 -68 19.2 -41 119 -14 590

-94 2.54 -67 20.6 -40 128 -13 630

-93 2.76 -66 22.1 -39 136 -12 660

-92 3.00 -65 23.6 -38 144 -11 700

-91 3.28 -64 25.6 -37 153 -10 740

-90 3.53 -63 27.5 -36 164 -9 780

-89 3.84 -62 29.4 -35 174 -8 820

-88 4.15 -61 31.7 -34 185 -7 870

-87 4.50 -60 34.0 -33 196 -6 920

-86 4.78 -59 36.5 -32 210 -5 970

-85 5.30 -58 39.0 -31 222 -4 1020

-84 5.70 -57 41.8 -30 235

-83 6.20 -56 44.6 -29 250

-82 6.60 -55 48.0 -28 265