Molekula
Type I water
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Type I water is ultra-pure deionized water, free from ionic contaminants, organic impurities, and particulate matter, used in high-precision applications like analytical chemistry, pharmaceutical manufacturing, and laboratory testing. It meets stringent purity standards (ASTM Type I or equivalent) with a resistivity of 18.2 MΩ·cm at 25°C. Molekula supplies Type I water from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Bacteria | ≤0.1 |
| pH | 6.0 - 8.0 |
| Chlorides | ≤1 ppm |
| Conductivity | ≤0.0555 μS/cm |
| Endotoxin | ≥0.25 EY/ml |
| TOC | ≤50 |
| Silica | ≤3 |
| Sodium (Na) | ≤1 ppm |
| Resistivity | ≥18 MΩ |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Colorless liquid |
| Odour | Odorless |
| Melting Point | 0 °C |
| Boiling Point | 99.97 °C |
| Density | 0.9950 g/cm³ at 25 °C |
| Solubility (other solvents) | Very soluble in ethanol, methanol, acetone |
| Vapour Pressure | 23.75 mmHg |
| Refractive Index | 1.333 |
Source: PubChem CID 962 (HSDB, Haz-Map)
Identification
| Property | Value |
|---|---|
| SKU | 90035519 |
| CAS Number | 7732-18-5 |
| IUPAC Name | oxidane |
| EC Number | 231-791-2 |
| Molecular Formula | H2O |
| Molecular Weight | 18.02 |
| Exact Mass | 18.0106 |
| SMILES | O |
| InChIKey | XLYOFNOQVPJJNP-UHFFFAOYSA-N |
| InChI | InChI=1S/H2O/h1H2 |
| PubChem CID | 962 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 2201.90.0000 |
| Tariff Code | 2853901000 |
Safety & GHS
-
Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P264 Wash thoroughly after handling
- P271 Use only outdoors or in a well-ventilated area
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+P352 IF ON SKIN: Wash with soap and water
- P304+P340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+P351+P338 IF IN EYES: Rinse continuously with water for several minutes. Remove contact lenses if present and easy to do, continue rinsing
- P321 Specific treatment (see supplemental first aid instructions on this label)
- P403+P233 Store in a well-ventilated place. Keep container tightly closed
- P405 Store locked up
- P501 Dispose of contents/container to an approved waste disposal plant
Documents
Safety Data Sheets (SDS)
Available in English, German, Spanish, French, Italian, Portuguese, Arabic, Dutch.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
Synonyms
- aqua
- Dihydrogen oxide
- Distilled water
- oxidane
- Purified water
- Sterile water
- water
- Water vapor
- Water, deionized
- Water, mineral
Frequently asked questions
What is Type I water (ultrapure water) commonly used for in laboratories?
Type I water is primarily used for high-purity applications such as HPLC, LC-MS, PCR, and cell culture, where even trace contaminants can interfere with results.
What is the chemical formula and molecular weight of Type I water?
The chemical formula is **H₂O**, and the molecular weight is **18.02 g/mol** (calculated from the atomic weights of hydrogen and oxygen).
How should Type I water be stored to maintain its purity?
Store in a clean, dedicated container at **ambient temperature**, away from direct sunlight, chemicals, or potential sources of contamination.
What purity grade is Molekula’s Type I water certified to?
Molekula’s Type I water meets **ASTM Type I** and **ISO 3696:1987 Grade 1** standards, with resistivity ≥18.2 MΩ·cm at 25°C.
Can Molekula supply Type I water in bulk (e.g., 50L+ containers or via tanker) for industrial or large-scale lab use?
Yes, we offer Type I water in bulk quantities, including **50L carboys, 275L drums, or custom tanker deliveries**, depending on your requirements.
What documentation is provided with a Type I water order?
Each order includes a **Certificate of Analysis (CoA)** detailing resistivity, TOC levels, and microbial testing, along with an **MSDS/SDS** for safety compliance.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.