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CFF Series-  Aluminum core with Silica (glass) Fiber Wrap
CFFC Series- Aluminum core with Carbon Fiber Wrap
KF Series- Aluminum core with Kevlar Fiber Wrap

Overview
Mountain High makes a variety of oxygen cylinders.  The most popular series is their AL series.  The KF Series weighs about 1/2 as much as the AL series.  However, is quite a bit more expensive, requires recurrent pressure testing every 3 years, and must be replaced after 15 years.

Cylinder Lengths
The Aluminum cylinder lengths shown in the tables below include the cylinder and valve - no regulator.  The added length for a standard XCR regulator is about 1.75 inches (45 mm).
The composite cylinder lengths shown in the tables below include the cylinder only - no valve or regulator.  The added length for a standard US CGA-540 valve and XCR regulator is about 3.5 inches (89 mm).

Cylinder Valve Port Types
There are 2 types of cylinder valve port types commonly used in aircraft.  It is important to know which one is on your cylinder when ordering a regulator for it.  The regulator attaches to this port.

• CGA-540 - US standard, Approximate outer diameter of threads: 0.902" (22.9 mm)
• DIN-477 - European standard, Approximate outer diameter of threads: 1.04" (25.4 mm)
  
  click on image to view larger version

All cylinders provided by Mountain High use 3/4 x 16 UNF straight threads.  However, 2 different types of o-rings are used - one for aluminum cylinders and a different type for fiber wrapped cylinders.

Airline Travel with Oxygen Cylinders
Airline travel with an oxygen cylinder requires preparation. The TSA requires that the valve be removed from the cylinder so they can look inside the cylinder.  The valve should be removed before you get to the security checkpoint. Mountain High said that the valve can be removed quite easily.  The threads on the valve are straight threads (not tapered threads) - which is nice.  An o-ring is used to make the seal.  When putting the valve back onto the cylinder it is very important that a torque wrench is use.  The torque wrench should be set for 60 to 65 ft*Lbs.  Please see the TSA web site in the link below for details.
https://www.tsa.gov/travel/security-screening/whatcanibring/items/small-compressed-gas-cartridges

When ordering cylinder valves, it is necessary to specify the service pressure rating of the cylinder that it will be used with.  Then the correct burst plug can be supplied in the valve.

Cylinder Testing Requirements 
I am often asked to clarify the life and testing requirements for oxygen cylinders.  The table below should help. 

Note: These testing and life requirements are specified by the U.S. Department of Transportation.  Oxygen cylinders are classified as "pressure vessels".  All cylinders provided by Mountain High meet all U.S. D.O.T. requirements and also meet all the requirements for Canada.

Series	Type	Photo	Description
AL Series	Aluminum		The AL aluminum oxygen cylinders are featured in our XCP, XCR & EDS portable oxygen systems. These cylinders feature our low-profile CGA-540 (oxygen) valve with pressure gauge that shows the amount in the cylinder at all times with the valve open or closed. Although these aluminum cylinders are intended for portable 'carry-on' applications, they have been used in some airborne applications. See our Full Pack cylinder harness & carry-caddy for these cylinders. Also see CMK cylinder hold-down kits.
CFF Series	Aluminum  core with Silica (glass) Fiber Wrap		CFF cylinders have an aluminum core with silica (glass) fiber wrap and are DOT-E 7277-3000 rated. These are high-pressure oxygen cylinders for service pressures up to 3,000 PSI. They can be optionally ordered with a DIN-477 (Euro-norm) valve with gauge.
CFFC Series	Aluminum core with Carbon Fiber Wrap
KF Series	Aluminum core with Kevlar Fiber Wrap		The lightest aircraft oxygen cylinder that technology has to offer. These Kevlar fiber-wrapped cylinders have been developed specifically for aircraft use. The KF series cylinders are the perfect solution for cylinder installations far aft in the aircraft previously not possible before. A thin-wall, seamless aluminum (6061-T6) alloy 'liner-cylinder' is reinforced by a full over-wrapping of Kevlar fibers sealed in epoxy. This yields about a 50% to 60% weight savings over conventional cylinder technology without any compromise in safety. These cylinders are preferred by many who build the state-of-the-art composite-fiber aircraft. They are made under a DOT mfg. protocol. If used in commercial applications or in a type-certified aircraft, the DOT service life is 15 years from the first hydro-test date and hydro-tests are done every three years. The KF series cylinders are complemented by our RCV/RCR remote-controlled-regulator system and built-in EDS system. The KF series cylinders can be secured for carry-about applications with the Full-Pack and Tuff-Pack cylinder carry-caddy harness systems. Kevlar Fiber cylinders are the lightest technology has to offer and are designed specifically and approved for aircraft applications. A simplified fabrication process is where the cylinder liner is made (steps 1,2,3 & 4) Fiber wrap (steps 5 & 6) are wrapped around the liner. Threads for the valving device is done after step 4 and before step 5. Epoxy is applied during the wrapping process. If the cylinder is to be used in type certified aircraft, by current DOT protocol, it must be hydro tested every 3 years and taken out of service if it fails or after 15 years from the first hydro test date comes about. Even if the cylinder passes hydro test. DOT protocol does not specifically detail any requirements for these cylinders if used in experimental aircraft. As of July of 2006, any Kevlar cylinder tested after that date can be hydro tested every 5 years (instead of 3).  That is true for cylinders manufactured before that date.

Oxygen Cylinder Dimensions and Duration Table

Inserts and Related Documents:
Cylinder Return Policy

Aluminium Oxygen Cylinder

• MH-00CYL-1002-00  |  AL-113  |  AL-113 Aluminum Oxygen Cylinder - No Valve
• MH-00CYL-1002-01  |  AL-113-540  |  AL-113-540 Aluminum Oxygen Cylinder with CGA-540 Valve and Gauge
  
• MH-00CYL-1002-02  |  AL-113-DIN  |  AL-113-DIN Aluminum Oxygen Cylinder with DIN-477 Valve and Gauge
  
• MH-00CYL-1004-00  |  AL-180  |  AL-180 Aluminum Oxygen Cylinder - No Valve
  
• MH-00CYL-1004-01  |  AL-18-5400  |  AL-180-540 Aluminum Oxygen Cylinder with CGA-540 Valve and Gauge
• MH-00CYL-1004-02  |  AL-180-DIN  |  AL-180-DIN Aluminum Oxygen Cylinder with DIN-477 Valve and Gauge
  
• MH-00CYL-1008-00  |  AL-248  |  AL-248 Aluminum Oxygen Cylinder - No Valve
  
• MH-00CYL-1008-01  |  AL-248-540  |  AL-248-540 Aluminum Oxygen Cylinder with CGA-540 Valve and Gauge
  
• MH-00CYL-1008-02  |  AL-248-DIN  |  AL-248-DIN Aluminum Oxygen Cylinder with DIN-477 Valve and Gauge
• MH-00CYL-1010-00  |  AL-415  |  AL-415 Aluminum Oxygen Cylinder - No Valve
  
• MH-00CYL-1010-01  |  AL-415-540  |  AL-415-540 Aluminum Oxygen Cylinder with CGA-540 Valve and Gauge
• MH-00CYL-1010-02  |  AL-415-DIN  |  AL-415-DIN Aluminum Oxygen Cylinder with DIN-477 Valve and Gauge
  
• MH-00CYL-1012-00  |  AL-647  |  AL-647 Aluminum Oxygen Cylinder - No Valve
• MH-00CYL-1012-01  |  AL-647-540  |  AL-647-540 Aluminum Oxygen Cylinder with CGA-540 Valve and Gauge
  
• MH-00CYL-1012-02  |  AL-647-DIN  |  AL-647-DIN Aluminum Oxygen Cylinder with DIN-477 Valve and Gauge
  
• MH-00CYL-1014-00  |  AL-682  |  AL-682 Aluminum Oxygen Cylinder - No Valve
  
• MH-00CYL-1014-01  |  AL-682-540  |  AL-682-540 Aluminum Oxygen Cylinder with CGA-540 Valve and Gauge
  
• MH-00CYL-1014-02  |  AL-682-DIN  |  AL-682-DIN Aluminum Oxygen Cylinder with DIN-477 Valve and Gauge

Aluminum core with silica Fiber wrap Oxygen Cylinder

• MH-00CYL-1038-00  |  CFF-480  |  CFF-480 Oxygen Cylinder, Aluminum core with Silica (glass) Fiber Wrap - No Valve or Gauge
• MH-00CYL-1038-01  |  CFF-480-540  |  CFF-480-540 Oxygen Cylinder, Aluminum core with Silica (glass) Fiber Wrap - with CGA-540 Valve and Gauge
  
• MH-00CYL-1038-02  |  CFF-480-DIN  |  CFF-480-DIN Oxygen Cylinder, Aluminum core with Silica (glass) Fiber Wrap - with DIN-477 Valve and Gauge
  
• MH-00CYL-1056-00  |  CFFC-022  |  CFFC-022 Oxygen Cylinder, Aluminum core with Carbon Fiber Wrap - No Valve or Gauge
• MH-00CYL-1056-01  |  CFFC-022  |  CFFC-022-540 Oxygen Cylinder, Aluminum core with Carbon Fiber Wrap - with CGA-540 Valve and Gauge
  
• MH-00CYL-1056-02  |  CFFC-022  |  CFFC-022-DIN Oxygen Cylinder, Aluminum core with Carbon Fiber Wrap - with DIN-477 Valve and Gauge
• MH-00CYL-1040-01  |  CFFC-048-540  |  CFFC-048-540 Oxygen Cylinder, Aluminum core with Carbon Fiber Wrap - with CGA-540 Valve and Gauge
  
• MH-00CYL-1040-02  |  CFFC-048-DIN  |  CFFC-048-DIN Oxygen Cylinder, Aluminum core with Carbon Fiber Wrap - with DIN-477 Valve and Gauge

Aluminum core with Kevlar Fiber Wrap

• MH-00CYL-1044-00  |  KF-011  |  KF-011 Oxygen Cylinder - Aluminum core with Kevlar Fiber Wrap - No Valve or Gauge
  
• MH-00CYL-1044-01  |  KF-011-540  |  KF-011-540 Oxygen Cylinder - Aluminum core with Kevlar Fiber Wrap - with CGA-540 Valve and Gauge
  
• MH-00CYL-1044-02  |  KF-011-DIN  |  KF-011-DIN Oxygen Cylinder - Aluminum core with Kevlar Fiber Wrap - with DIN-477 Valve and Gauge
• MH-00CYL-1052-00  |  KF-077  |  KF-077

• Oxygen Cylinders and Cylinder-related Products
• AL Series

• CFF Series
• CFFC Series

• Cylinder Carry Cases
• Cylinder Mounting Options

• Cylinder Valves
• KF Series