Scuba Tanks vs. Wetsuit Thickness
Comparing 2 standards across 19 specifications. 19 key differences identified.
Scuba diving high-pressure cylinders and valves are regulated under ISO 9809 (Steel), ISO 7866 (Aluminum), US DOT-3AL/3AA, and EN 250. The world's most common recreational cylinder is the Aluminum 80 (AL80), with an internal water capacity of 11.1 liters (0.39 cu ft), working pressure of 3,000 psi (207 bar), and delivering 77.4 cu ft (2,192 L) of free air. Cylinder valves connect to first-stage regulators via two distinct standards: Yoke (A-clamp / INT; rated to 232 bar / 3,365 psi) and DIN (G 5/8" threaded connection; rated to 232 bar or 300 bar / 4,350 psi).
Wetsuit thermal insulation is defined by closed-cell neoprene thickness in millimeters, designated as a dual or triple number (e.g. 3/2 mm, 4/3 mm, 5/4 mm, 6/5/4 mm). The first (larger) number denotes the torso/core thickness for vital organ warmth; the secondary number denotes the limb/arm thickness for paddling flexibility. Temperature ratings range from 2 mm / shorties (20–25 °C / 68–77 °F) to 5/4 mm and 6/5 mm hooded suits with liquid-taped seams for sub-arctic water (sub-8 °C / sub-46 °F).
Specification Comparison Table
19 Parameters| Parameter / Spec | ||
|---|---|---|
|
Aluminum 80 (AL80) Free Air Volume
|
2,192 liters (77.4 cu ft at rated working pressure) | — |
|
AL80 Working Pressure
|
207.0 bar (3,000 psi / 20.7 MPa) | — |
|
AL80 Internal Water Capacity
|
11.1 liters (0.39 cu ft internal volume) | — |
|
AL80 Empty Tare Weight
|
14.2–14.5 kg (31.4–32.0 lbs without valve) | — |
|
AL80 Buoyancy (Full vs Empty)
|
-0.7 kg (-1.6 lbs sink) Full / +1.9 kg (+4.1 lbs float) Empty Seawater Buoyancy | — |
|
High-Pressure Steel 100 (HP100) Pressure
|
237.0–300.0 bar (3,442–4,350 psi / 12.9L water capacity) | — |
|
HP100 Buoyancy (Full vs Empty)
|
-3.8 kg (-8.4 lbs sink) Full / -1.1 kg (-2.5 lbs sink) Empty Remains negative | — |
|
Yoke Valve (A-Clamp / INT)
|
Max 232 bar (3,365 psi; clamp bracket over captured O-ring) Recreational Standard | — |
|
DIN Valve Standard
|
G 5/8 in Thread (EN 144-2 / ISO 12209) 232 bar (5 threads) or 300 bar (7 threads) | — |
|
Hydrostatic Test Cycle
|
Every 5 Years (at 5/3x working pressure: 5,000 psi for AL80) DOT / ISO Recertification | — |
|
2 mm / Shorty Temperature Range
|
— | 20.0–25.0 °C (68.0–77.0 °F warm summer water) |
|
3/2 mm Fullsuit Temperature Range
|
— | 15.0–20.0 °C (59.0–68.0 °F spring/autumn water) |
|
4/3 mm Fullsuit Temperature Range
|
— | 12.0–15.0 °C (53.6–59.0 °F cool water standard) |
|
5/4 mm (with Hood) Temperature Range
|
— | 8.0–12.0 °C (46.4–53.6 °F cold winter water) |
|
6/5 mm / 6/5/4 mm Hooded Winter Range
|
— | Sub-8.0 °C (sub-46.4 °F arctic / freezing water) |
|
Primary Material Composition
|
— | Closed-Cell Nitrogen-Blown Limestone Neoprene (Chloroprene Rubber) Standard |
|
Flatlock Seams
|
— | Breathable stitch for 2 mm warm-water suits (water permeates seam) Warm Water |
|
GBS (Glued and Blindstitched)
|
— | Water-tight glued seams with curved needle blindstitching (3/2 & 4/3) Cool Water |
|
Liquid Taped / Fluid Seam Weld
|
— | External liquid silicone/polyurethane bead over internal neoprene tape Cold Water Fully Sealed |