High-purity vinyl monomer with sulfonic acid groups, used in oilfield drilling additives, water treatment polymers, synthetic fibers, and specialty coatings. Available as solid anhydrous acid or aqueous sodium salt solution.
AMPS (2-Acrylamido-2-methylpropane sulfonic acid) is a highly reactive, hydrophilic propylene sulfonate monomer that has been widely used in polymer chemistry since the 1970s. Due to the presence of sulfonic acid groups in the molecule, AMPS copolymers exhibit significantly improved hydrophilicity, thermal stability, and resistance to hydrolysis compared to conventional acrylamide-based polymers.
AMPS is available as dry white crystals (free acid) or as an aqueous sodium salt solution. It can be homopolymerized or copolymerized with acrylamide, acrylic acid, acrylonitrile, styrene, and other water-soluble monomers for a wide range of industrial polymer applications.
| Parameter | Specification |
|---|---|
| Appearance | Dry white crystals |
| Purity | ≥ 99% |
| Non-Volatile Matter Content | ≥ 99% |
| Molecular Formula | C₇H₁₃NO₄S |
| Molecular Weight | 207 g/mol |
| Acid Value | 272 – 282 mgKOH/g |
| Melting Point | 185°C (partial decomposition) |
| Decomposition Temperature | 210°C |
| pH (0.1% aqueous solution) | ~2.6 (strong acid) |
| Fe Content | ≤ 0.5 ppm |
| Odor | Slightly acidic |
| Packaging | 25 kg three-layer composite bags (moisture-proof) |
AMPS is highly hygroscopic. Moisture exposure causes polymerization. Keep sealed in dry storage at all times.
| Parameter | Specification |
|---|---|
| Form | Aqueous sodium salt solution |
| Active Content | 50% (typical) |
| Appearance | Clear to slightly hazy liquid |
| pH | ~7.0 (neutral) |
| Decomposition Temperature (Na salt) | 329°C |
| Stability | Inhibitor added to prevent self-polymerization |
| Packaging | IBC totes or drums (on request) |
Sodium salt solution is neutral in pH and easier to handle than the free acid form. Contact us for concentration options and packaging details.
| Standard Packaging | 25 kg three-layer composite bags (moisture-proof inner lining) |
| Storage Conditions | Store in a sealed, cool, dry place. Keep away from moisture — exposure causes polymerization. Avoid heat sources and direct sunlight. |
| Shelf Life | 12 months from manufacture date under recommended conditions |
| Handling Note | AMPS is highly hygroscopic. Open bags must be resealed immediately after use. Add inhibitor if preparing aqueous solutions for storage. |
| HS Code | 2924.19 (Acyclic amides and their derivatives) |
AMPS (2-Acrylamido-2-methylpropane sulfonic acid) is a monomer copolymerized into functional polymers used across oilfield drilling fluids, water treatment, synthetic fiber production, textile sizing, paints and coatings, and papermaking — valued for its salt tolerance and versatile polymerization chemistry.
The solid crystal (free acid) form is ≥99% pure with a strongly acidic pH of ~2.6 in 0.1% aqueous solution, decomposing at 210°C. The sodium salt solution is neutral (pH ~7.0) with 50% typical active content, is easier to handle than the free acid, and includes an inhibitor to prevent self-polymerization during storage.
High-molecular-weight AMPS copolymers maintain viscosity and performance in high-salinity brines and saturated salt drilling fluids, and are used as fluid loss reducers, viscosifiers, and solid control agents with strong heat and salt resistance for demanding HTHP (high-temperature, high-pressure) wells.
AMPS solid crystal is highly hygroscopic — moisture exposure causes polymerization, so opened bags must be resealed immediately. Store sealed in a cool, dry place away from heat sources and direct sunlight. Shelf life is 12 months from the manufacture date under recommended conditions.
AMPS is compatible with free-radical homo- and co-polymerization, and is commonly copolymerized with acrylamide, acrylic acid, and acrylonitrile using persulfate initiators — the basis for its use in fiber, textile sizing, and coatings applications.
Minimum order is 1 MT and is negotiable depending on form (solid crystal or sodium salt solution) and destination. Contact us with your required form, quantity, and application for a quote.
AMPS pricing depends on form (solid crystal vs. sodium salt solution), purity, order quantity, packaging, and destination/shipping terms. Contact us with your required form and quantity for a quote.
Yes — a material safety data sheet (MSDS) is available on request, which is particularly relevant given AMPS's strongly acidic nature in solid crystal form and its hygroscopic handling requirements.
ZHAOYUAN supplies AMPS directly from China with export capability for bulk orders worldwide, and also delivers turnkey EPC engineering for cellulose ether production plants — giving customers both a chemical supply source and a manufacturing-side engineering partner.