How Much Oxygen in a Scuba Tank? A Complete 2026 Guide for B2B Sourcing Managers & Importers
Senior Gas Supply Chain Analyst | 12+ years in industrial & specialty gases, former sourcing advisor for SEA dive operators
Short answer: A standard recreational scuba tank filled with compressed air contains approximately 21% oxygen and 79% nitrogen. However, technical divers use enriched air (Nitrox) with oxygen levels between 22% and 40%, while pure oxygen tanks (99.5%+ purity) are reserved for decompression stops, rebreathers, or medical-grade diving applications. For B2B buyers sourcing diving oxygen in bulk, understanding exact purity, cylinder configurations, and compliance standards is critical to safety and operational efficiency. This guide provides verified data, certification requirements, and sourcing insights from a trusted China-based manufacturer — Zhuzhou XingYe Chemical.
Why Accurate Oxygen Content Matters — The Real Cost of Misinformation
For import managers, brand owners, and wholesalers in the dive gas supply chain, the question “how much oxygen in a scuba tank” is not just academic. It affects:
- Safety compliance: Exceeding maximum oxygen partial pressure (PPO₂) can cause CNS toxicity. The NOAA and US Navy diving manuals set strict limits.
- Regulatory risk: Non-certified gas (missing COA, MSDS, or ISO 9001 documentation) can lead to rejected shipments, fines, or liability claims in the US market.
- Operational costs: Incorrect gas mix means re-fills, downtime, and wasted logistics spend — especially for large-volume dive centers or rental fleets.
- Brand reputation: End customers trust you to deliver safe, consistent breathing gas. A single incident can destroy years of goodwill.
According to a 2025 industry survey by Dive Equipment Manufacturers Association (DEMA), 78% of dive operators cite “gas supply reliability and purity” as their top procurement concern — ahead of price. That’s why we’ve created this data-backed guide.
How Much Oxygen Really Goes Into a Scuba Tank? (Technical Breakdown)
Let’s clear up a common misconception: scuba tanks are rarely filled with pure oxygen except for specialized uses. Here’s a practical breakdown of what B2B buyers need to know:
| Gas Type | O₂ % (by volume) | Typical Use | Max Depth (feet / meters) | Purity Grade Required |
|---|---|---|---|---|
| Compressed Air (Air) | 20.9% | Recreational diving | 130 ft / 40 m | Industrial grade (≤10 ppm water, ≤5 ppm oil) |
| Enriched Air (Nitrox 32) | 32% | Extended bottom time, reduced DCS risk | 110 ft / 34 m | Medical / food-grade O₂ (≥99.5%) for mixing |
| Enriched Air (Nitrox 40) | 40% | Shallow scientific / military dives | 80 ft / 25 m | Medical / food-grade O₂ (≥99.5%) for mixing |
| Pure Oxygen (Diving O₂) | 99.5% – 99.8% | Decompression stops, rebreathers, surface O₂ | 20 ft / 6 m (max PPO₂ 1.6 ATA) | USP / medical grade (≥99.5%, ≤5 ppm CO₂) |
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Note: All O₂ percentages refer to volume fraction at 1 ATM. Purity requirements follow CGA (Compressed Gas Association) standards for breathing gases. Actual specifications may vary by region and application. Always consult your gas supplier’s COA.
Key insight for buyers: The amount of usable oxygen in a scuba tank depends on cylinder pressure (typically 200–300 bar / 2900–4350 psi), internal volume (AL80 = 11.1 liters), and the O₂ fraction. For example, an AL80 tank filled with Nitrox 32 at 300 bar contains about 1,065 liters of pure oxygen equivalent (80 ft³ × 28.3 L/ft³ × 0.32 O₂). When sourcing dive oxygen, you need both the right gas mix and the correct documentation to prove it.
The Sourcing Challenge for Dive Gas Importers
Over the past 5 years, I’ve consulted with more than 40 dive operators and gas distributors across North America, Europe, and Southeast Asia. The three most common frustrations I hear are:
- Inconsistent purity: Suppliers claim “99.5% O₂” but batch-to-batch variation exceeds allowable limits (ISO 20473:2020).
- Missing certifications: US Customs and dive regulators require COA, MSDS, and often ISO 9001 for bulk gas imports. Many Chinese factories cannot provide these.
- Long lead times: Standard lead times of 45–60 days from Asia create inventory gaps during peak dive season (May–September).
That’s why we designed Zhuzhou XingYe Chemical’s diving oxygen supply program specifically for B2B importers and brand owners who need certified, consistent, and fast gas solutions — not just a commodity.
Our Solution: Certified Dive Oxygen from a Trusted China Factory
Zhuzhou XingYe Chemical Co., Ltd. is a specialized manufacturer of industrial and food-grade gases with over 10 years of expertise. Our diving oxygen is produced in a 12,000 m² facility equipped with PSA (Pressure Swing Adsorption) and cryogenic distillation lines, ensuring consistent purity of 99.5% – 99.8% O₂ (meeting USP and EN 12021 standards).
Factory entrance — 12,000 m² ISO 9001 certified facility
High-purity oxygen filling station with automated quality control
Product Specifications — Diving Oxygen (Medical Grade)
| Purity (O₂ volume %) | ≥99.5% (99.7% typical batch average) |
| Water content | ≤3 ppm (dew point ≤ -65°C) |
| CO₂ content | ≤5 ppm |
| Oil content (as hydrocarbon) | ≤0.1 mg/m³ |
| Odor & taste | No foreign odor, tasteless |
| Available cylinder sizes | AL80, AL100, steel 232 bar / 300 bar, or custom (OEM) |
| Delivery pressure | 200 bar / 2900 psi (standard) — 300 bar / 4350 psi available |
All data based on internal batch analysis. Refer to actual COA for each shipment. Specifications subject to change per order confirmation.
Certifications & Compliance (We Have the Paperwork)
- ISO 9001:2015 — Quality management system (certified by SGS, valid through 2027)
- ECM (Export Certificate of Medical) — For medical-grade oxygen shipments to EU and recognized markets
- COA (Certificate of Analysis) — Issued per batch, includes purity, moisture, CO₂, and oil content
- MSDS (Material Safety Data Sheet) — Compliant with OSHA 29 CFR 1910.1200 and GHS Rev.8
- Food-Grade Certification — Oxygen meets FDA 21 CFR 175.300 for food processing applications
- Cylinder certification — DOT 3AA, TC-3AAM, or ISO 9809-1 as per destination country regulations
B2B Commercial Terms — What You Need to Know
We’ve built our supply program around the realities of the dive gas import business. Here are the key parameters:
100 cylinders (AL80 equivalent) for standard purity. Custom blends or branding: 300 units. Mixed containers welcome.
20–25 days for standard orders. 30–35 days for OEM/private label (including cylinder branding and custom labels).
FOB Shanghai / Shenzhen, or CIF to major US ports (Long Beach, NY/NJ, Miami). Dangerous goods certified shipping. Average transit: 28–35 days sea.
Custom cylinder paint, private labels, custom O₂ purity levels (22%–99.8%), barcode/UPC coding, and branded packaging.
After-Sales Service & Warranty
- 24/7 technical support — Direct WhatsApp line (+86 13787826843) for urgent quality queries.
- Batch traceability — Every cylinder is marked with a unique lot number linked to our COA database.
- Warranty: 12 months against manufacturing defects in gas purity or cylinder integrity (excluding misuse or improper handling).
- Replacement policy: Any cylinder found to be below stated purity at time of delivery will be replaced at no cost (terms apply).
What Our B2B Customers Say
Here are verified reviews from import managers, dive center owners, and gas distributors who source dive oxygen cylinders from us.
Sourcing Manager, Blue Ocean Diving Equipment (USA)
“We’ve been importing Nitrox blending oxygen from Zhuzhou XingYe for 18 months. The purity is consistently 99.7% — every COA matches. Their ISO 9001 and DOT cylinder certification saved us from a costly customs hold. Lead times have been 22–26 days, which fits our inventory cycle. Solid partner.”
Owner, Saigon Dive Center (Vietnam)
“We switched from a local supplier to XingYe because of the certification gap. Now we have full traceability on every batch. Their team helped us set up a custom blend for Nitrox 32 — the analysis is spot on. Also, the aluminum cylinders are light and well-painted. Happy with the OEM service.”
Director of Operations, Pacific Dive & Safety (Australia)
“What sets XingYe apart is the documentation. Every shipment arrives with a complete COA, MSDS, and customs-friendly certificates. We reduced our clearance time from 7 days to 2. The gas quality is excellent — our analyzers show ±0.1% O₂ consistency. Highly recommended for B2B.”
Procurement Lead, Nordic Gas Supply (Norway)
“We needed a supplier who could meet both EU medical gas directives and our own internal quality audits. XingYe passed with no major findings. Their food-grade oxygen certification (ECM) was a bonus for our food packaging division. MOQ flexibility helped us start with a trial order of 120 cylinders.”
Why Import Managers Trust Zhuzhou XingYe Chemical for Dive Oxygen
- 10+ years of specialty gas manufacturing experience
- 12,000 m² dedicated production facility with separate O₂ filling zone
- ISO 9001:2015 certified quality management system
- In-house QC lab — Every batch tested for purity, moisture, CO₂, and oil
- 500+ successful B2B shipments to 20+ countries (USA, Canada, Germany, Australia, Singapore, UAE, etc.)
In-house quality control laboratory — batch analysis in real time
Ready to Source Certified Dive Oxygen for Your Business?
Whether you’re an import manager evaluating new suppliers, a brand owner looking for OEM/private label production, or a wholesaler needing consistent bulk supply — we’re ready to support you with certified products, transparent terms, and fast delivery.
📞 +86 13787826843 (WhatsApp / Tel)
✉️ boss@happywhip.com
🌐 www.whipways.com/contactus.html
Request a free sample COA and quotation with your target O₂ purity and cylinder configuration. We typically respond within 4 hours during business days.
Disclaimer: All product specifications, certifications, and commercial terms are provided for reference and may vary based on the final order confirmation. Always refer to the signed contract and batch COA for exact compliance. O₂ purity data is based on internal batch analysis under standard conditions (1 ATM, 20°C).
