ASTM D1141 Artificial Seawater – The gold standard in seawater for corrosion testing
US Corrosion Services supplies ASTM D1141-compliant artificial seawater and sea salt to testing labs, manufacturers, and researchers across the country. We’re not just a chemical supplier, we’re a metallurgical testing and corrosion consulting lab in Houston, and we use this product in our own work every week. That means you get a product backed by people who understand your application, not just your purchase order.
Need help now? Call 832-481-6600, email for a Quote (info@uscorrosion.com), or click here:
What ASTM D1141 Actually Specifies
ASTM D1141 defines the standard practice for preparing substitute ocean water. Originally published as D1141-52 and most recently reapproved as D1141-98(2021), the standard specifies concentrations of sodium chloride, magnesium chloride hexahydrate, sodium sulfate, calcium chloride, potassium chloride, sodium bicarbonate, potassium bromide, boric acid, strontium chloride hexahydrate, and sodium fluoride to produce a reproducible synthetic seawater at approximately 35 g/kg salinity. The standard also defines a heavy-metals formulation that adds trace metal nitrates (barium, manganese, zinc, lead, and others) for applications where minor-element electrochemistry matters.
Natural seawater varies by location, season, depth, and biological activity. When a test method calls for seawater, D1141 provides a chemically defined, reproducible electrolyte so that results from one laboratory or test can be compared meaningfully against results from another. We supply D1141 artificial seawater in dry and liquid form, in standard and heavy-metals formulations, and in volumes from bench-scale to 55-gallon drums. If your testing calls for seawater, whether that’s corrosion (like ASTM G48 pitting corrosion testing, ASTM G31 immersion corrosion, B117 salt fog testing, or NACE TM0177 SSC testing), firefighting, subsea applications, or more D1141 salt gives you a chemically-defined, reproducible medium so your results mean something.
What We Offer
Our granular salt blend dissolves in distilled or deionized water at approximately 41.953 g/L (about 156 g/gal) to produce artificial seawater matching the D1141 major-ion composition. After mixing, adjust pH to 8.2 using 0.1 N NaOH or HCl per the standard. A small amount of insoluble residue from naturally occurring impurities in the component salts can be filtered without affecting solution accuracy.
The standard 40-pound container makes approximately 114 gallons of artificial seawater, which is typically sufficient for mid-scale corrosion testing programs. Pricing starts at $315 per container plus shipping. Bulk discounts are available for multi-container orders, and Houston-area customers may qualify for free or reduced-cost local delivery.
D1141 Sea Salt Mix (Dry Salt)
Our granular salt blend is ready to dissolve in distilled or deionized water at 40 g/L (approximately 151 g/gal). This is ideal when you want to control batch timing and volume. Available from sizes of five pound sample packs up to 40 lb containers and bulk quantities.
D1141 Artificial Seawater (Pre-Mixed Liquid)
Ready-to-use liquid seawater, pH-adjusted per the ASTM spec. Saves prep time when you need to get specimens into solution quickly. Available in volumes from 1 gallon up to 55-gallon drums.
D1141 Heavy Metals Sea Salt Option
The full-specification formulation adds trace metal nitrates (barium, manganese, zinc, lead, and others) per ASTM D1141 Table X1.2 for testing applications where minor-element chemistry influences corrosion behavior or biological response. Available in both dry and liquid form. Most corrosion testing applications use the standard formulation; the heavy-metals version is required only when the referring test standard or client specification explicitly calls for it.
Custom & Modified Blends
Need a modified chloride concentration, adjusted pH, or a proprietary additive blended in? We make custom formulations tailored to your specific test protocol. Contact us with your requirements.
Included with every order: Certificate of Analysis · Safety Data Sheet · Mixing Instructions · Technical Support
Test Standards That Reference D1141 Seawater
ASTM D1141 artificial seawater is called out by a broad range of corrosion, materials, and coatings test methods. Common ones include:
ASTM G48 (pitting and crevice corrosion resistance of stainless steels and related alloys), ASTM G31 (immersion corrosion testing), ASTM G44 (alternate immersion stress corrosion cracking), ASTM B117 (salt fog/salt spray testing), NACE TM0177 (sulfide stress cracking, when seawater variants are specified), ASTM G71 (galvanic corrosion testing), and numerous OEM and operator specifications in oil and gas, marine, aerospace, and defense sectors. D1141 is also used as the electrolyte in hydrogen embrittlement testing where the test environment calls for a seawater medium, and in coatings assessment programs evaluating marine service performance. If your test method references “substitute ocean water,” “synthetic seawater per ASTM D1141,” or simply “artificial seawater,” this product meets that requirement.
Pricing & Ordering
We keep pricing simple and competitive. Our standard 40-pound container of D1141 sea salt makes approximately 114 gallons of artificial seawater, which is enough for most mid-scale test programs.
$315 per 40 lb Container
Plus shipping. Bulk discounts available for multi-container orders. Houston-area customers may qualify for free or reduced-cost local delivery depending on order size.
We also offer smaller quantities starting at five pounds for trial batches and student research, and larger volumes like 55-gallon drums of salts or pre-mixed liquid for high-throughput labs, or even pallet loads of salts. For heavy metals formulations, custom blends, or volume pricing, call us at 832-481-6600 or email info@uscorrosion.com and we’ll get you a quote the same or next day.
Why Buy Seawater and Salt From a Corrosion Lab?
Most D1141 suppliers are just distributors. They blend the salt, ship the pail, and that’s the end of the relationship. We’re different. US Corrosion Services is a metallurgical testing, failure analysis, and corrosion consulting firm. Founded by a PhD metallurgical engineer with degrees from MIT and Colorado School of Mines and over 16 years experience in the field. Our team runs pitting tests, immersion studies, salt fog chambers, and electrochemical experiments with this exact product on a regular basis – and we can help with post-test analysis, consulting, and implementation of changes based on the results.
That means when you call us with a question like “Which version do I need of ASTM G48?” or “Can I reuse this solution after a 30-day immersion test?”, you’re talking to corrosion engineers, not a customer service desk reading from a spec sheet. We’ve built our reputation on being the technical resource our clients can call when they need answers, and that extends to every product we sell. We also provide expert witness services when corrosion issues end up in litigation.
Frequently Asked Questions
What’s the mixing ratio for D1141 sea salt? Dissolve 40 grams of sea salt per liter of distilled or deionized water (approximately 151 grams per gallon). Add the salt slowly while stirring continuously. A magnetic stir plate works well, but manual stirring for 15–20 minutes is fine too. All crystals must be fully dissolved before use. Never use tap water, as the dissolved minerals and chlorine will contaminate your solution and compromise your test results.
What’s the shelf life? Dry sea salt stores indefinitely in a sealed container at room temperature indoors. Just keep it dry and it won’t degrade but in high humidity locations a desiccant may be required to prevent clumping. Pre-mixed liquid seawater should be used within 6–12 months and stored sealed in a clean container away from direct sunlight. If you notice precipitation, discoloration, or biological growth in liquid seawater, discard it and mix a fresh batch.
Standard version or heavy metals — which do I need? For the vast majority of corrosion testing, including pitting resistance, crevice corrosion, immersion studies, salt fog, the standard formulation is what you want. It’s what most ASTM and NACE/AMPP test methods specify. The heavy metals version adds trace metal nitrates and is primarily used when the electrochemistry of minor elements matters to your research (certain academic studies, biological exposure tests, or when a client spec explicitly calls for the full-composition version).
Which test standards require D1141 seawater? D1141 seawater is referenced by a broad range of test methods. Common ones include ASTM G48 (pitting and crevice corrosion), G31 (immersion corrosion), G44 (alternate immersion stress corrosion), B117 (salt fog), NACE TM0177 (sulfide stress cracking with seawater variants), and numerous OEM and operator specifications in oil & gas, marine, aerospace, and defense. D1141 is also commonly used in hydrogen embrittlement testing where the environment calls for a seawater electrolyte, and in coatings assessment programs evaluating marine service performance. If your test method calls for “substitute ocean water” or “synthetic seawater per ASTM D1141,” this is the product.
How does artificial seawater compare to natural seawater? D1141 artificial seawater matches the major-ion chemistry of average ocean water at 35 g/kg salinity. What it deliberately excludes is organic matter, suspended sediment, dissolved gases, and living microorganisms, all of which vary unpredictably in natural seawater and cannot be controlled in a laboratory setting. That exclusion is the entire point of the standard: by removing those variables, you get a reproducible electrolyte for controlled testing. The ASTM standard itself notes that results in D1141 seawater should not be assumed identical to results in natural ocean exposure, but for laboratory screening, qualification testing, and comparative studies, it is the accepted baseline worldwide.
Can D1141 seawater be used with cathodic protection testing? Yes. D1141 artificial seawater is commonly used as the electrolyte in cathodic protection studies, galvanic corrosion testing per ASTM G71, and electrochemical experiments where you need a defined seawater environment. We use it ourselves for these applications routinely.
Do you ship outside of Houston? Yes. We ship nationwide via UPS and freight carriers. Dry sea salt ships easily and economically; liquid seawater in larger volumes ships via pallet freight. Houston-area orders may qualify for free or discounted local delivery depending on size. International shipping is available on request.
What’s the typical lead time? Standard formulations in stock sizes typically ship within 1–3 business days. Custom blends, heavy metals formulations, and large-volume orders may require 5–7 business days. If you’re on a tight timeline, call us — we’ll do what we can to expedite.
Can I get a sample before committing to a larger order? Absolutely. We offer small-quantity packs starting at five pounds, enough to mix 15 gallons for a trial run. This is popular with university research groups and labs evaluating a new supplier.
Ready to Order?
Call us for pricing, lead times, or technical questions about which formulation fits your testing program. Same-day quotes on standard and custom orders.
How much does ASTM D1141 artificial seawater cost?
We offer flexible pricing based on your volume needs from samples to bulk quantities of D1141 sea salt:
| Package Size | Makes | Starting Price* |
|---|---|---|
| 250g Samp | ~6.25 liters (1.65 gallons) | $24 |
| 1 kg (2.2 lb) | ~25 liters (6.6 gallons) | $68 |
| 5 lb Bucket | ~56.7 liters (15 gallons) | $135 |
| 40 lb Pail (5-gallon) | ~454 liters (120 gallons) | $315 |
| 55-gallon Drum | ~1200 gallons | $2950 |
| Bulk Quantities | As Needed | Contact for quote |
Bulk Discounts Available: Contact us for larger quantities. Pre-mixed liquid seawater is also available for immediate use. Call 832-481-6600 or email us for a custom quote based on your needs.
How do I prepare ASTM D1141 artificial seawater?
Step-by-step mixing instructions:
- Use the right water: Only use distilled water or deionized (DI) water – tap water will contaminate your solution
- Measure correctly: Use 40 grams of salt mixture per liter of water (or 151g per gallon)
- Mix thoroughly: Add salt slowly while stirring continuously. Use a magnetic stirrer or mix manually for 15-20 minutes
- Dissolve completely: All salts must be fully dissolved before use – no visible crystals should remain
- Adjust volume: After dissolution, add DI water to reach final target volume
- Verify quality: Final solution should have salinity of ~3.5% (35 g/L) and pH of 8.0-8.3
Pro Tip: Water temperature affects dissolution time. Warmer water (20-25°C) dissolves salts faster. For best results, verify salinity with a refractometer or conductivity meter.
For bulk preparation (our 40 lb pail): Dissolve entire bucket in approximately 120 gallons of DI water. Adjust to achieve final salinity of 3.5%.
How long does artificial seawater last and how should I store it?
Dry Salt Mixture (Unmixed):
- Shelf life: 2+ years when properly stored
- Storage: Keep in sealed container in cool, dry location
- Watch for: Moisture absorption (hygroscopic material) – if salts clump together, they’ve absorbed moisture
- Best practice: Store in original sealed bucket or transfer to airtight container with desiccant
Mixed Artificial Seawater (Liquid Solution):
- Optimal use: Within 30 days of mixing for best accuracy
- Maximum storage: Up to 365 days if stored properly
- Storage conditions: Sealed containers, away from direct sunlight, room temperature or cooler
- Watch for: Algae growth (green tint), precipitation of salts, pH drift
Quality Tip: For critical testing, we recommend mixing fresh batches for each test series. If you must store mixed seawater, add 0.1% sodium azide as a biocide to prevent bacterial growth (not suitable for biological studies).
Can I use ASTM D1141 artificial seawater in my aquarium?
No, we do not recommend using ASTM D1141 artificial seawater for aquariums. Here’s why:
ASTM D1141 is designed for:
- Laboratory testing and corrosion studies
- Industrial applications
- Materials research
Aquarium salt mixes are different because they include:
- Trace elements essential for coral and fish health (iodine, iron, manganese, etc.)
- Proper calcium and alkalinity for reef tanks
- Buffering agents for long-term pH stability in biological systems
- Quality standards for marine life safety
While ASTM D1141 has the correct major salt composition, it lacks the trace elements and specific formulation needed to support marine life. Bottom line: Use aquarium-specific salt mixes for fish and coral. Use ASTM D1141 for testing equipment, materials, and coatings.
Do you ship nationwide? What about Houston-area pickup?
Yes! We ship throughout the United States.
Shipping Options:
- Dry salt mixtures: Ship via UPS/FedEx Ground – typically 3-5 business days
- Pre-mixed liquid seawater: Available for local Houston delivery or freight shipment for bulk orders
- Bulk orders (drums/totes): Freight shipping available nationwide
- International: Available upon request – contact us for quote
Houston Local Pickup (Will Call):
- Location: 8307 Kempwood Dr, Houston, TX 77055
- Hours: Monday-Friday, 8:00 AM – 5:00 PM
- Please call ahead: 832-481-6600 to ensure your order is ready.
Houston-area delivery: Available for liquid seawater and bulk orders. Contact us for details.
Shipping Tip: Dry salt mixtures are lighter and more economical to ship. If you have the ability to mix on-site, we recommend ordering dry salts rather than pre-mixed liquid.
Not sure which version you need? Check your testing standard or specification. If it specifically mentions “heavy metals” or “trace metals,” you’ll need that version. Otherwise, standard ASTM D1141 is what you want. Or call us at 832-481-6600 and we can help you choose.
Why Choose US Corrosion Services?
Expertise: With years of experience in the corrosion and materials testing field, we provide products and services you can trust.
Quality Assurance: Our rigorous quality control process ensures that every batch of artificial seawater meets our high standards and specifications.
Customer Support: Our team of experts is available to assist you with selecting the right products for your testing requirements and to answer any questions you may have.
Order Your ASTM D1141 Artificial Seawater Today: Elevate your testing and research with the precision and reliability of US Corrosion Services’ ASTM D1141 artificial seawater. Contact us today to place your order or to learn more about our products and services.