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Industrial Grade ≥99.5%
Royalchem
67-51-6
| Product Name | 3,5-Dimethylpyrazole (3,5-DMP) Isocyanate Blocking Agent / Pyrazole Specialty Chemical |
| CAS NO. | 67-51-6 |
| Molecular Formula & Weight | C5H8N2 (MW: 96.13) |
| Chemical Structure |  |
| Core Positioning | 3,5-DMP Manufacturer / Isocyanate Blocking Agent / Blocked Polyisocyanate Raw Material Royalchem manufactures 3,5-Dimethylpyrazole for industrial customers developing blocked polyisocyanates, polyurethane crosslinkers, coatings, adhesives and related specialty-chemical applications. |
3,5-Dimethylpyrazole is a core Royalchem-manufactured product.We support industrial customers with trial evaluation, commercial-scale purchasing and long-term supply programs for polyurethane, coating, adhesive and fertilizer-related applications.
| Manufacturer | Royalchem |
| Product | 3,5-Dimethylpyrazole / 3,5-DMP |
| CAS | 67-51-6 |
| Typical Assay | ≥99.5% |
| Commercial Supply | Trial quantity / bulk order / annual demand / long-term supply |
| Test Item | Typical Specification |
| Appearance | White to off-white crystalline powder / crystal |
| Assay | ≥99.5% |
| Moisture | ≤0.50% |
| Melting Point | 106–108°C |
The above values represent Royalchem's current typical commercial specification. Final analytical methods, impurity requirements and batch results should follow the mutually confirmed specification and actual batch COA.
| Physical State | Solid |
| Reference Melting Point | Approx. 106–109°C |
| Reference Boiling Point | Approx. 218°C |
| Solubility | Soluble in water and soluble in several common organic solvents (reference) |
Reference physical properties are provided for substance identification and process evaluation and are not fixed Royalchem release specifications.
3,5-DMP is widely used as a pyrazole-type blocking agent for polyisocyanates. It reacts with active NCO groups to produce blocked isocyanate structures with controlled reactivity during formulation and storage. Under suitable thermal curing conditions, the blocked system can regenerate reactive isocyanate functionality and participate in crosslinking.
| Blocked Polyisocyanate Manufacturers | Raw material for DMP-blocked HDI, IPDI and other polyisocyanate crosslinker systems. |
| 1K Polyurethane Crosslinkers | Used in latent, heat-activated polyurethane systems requiring controlled storage stability and thermal crosslinking. |
| Automotive & Industrial Coatings | Relevant to one-component stoving coatings, automotive clearcoats and related thermally cured coating systems. |
| Powder & Coil Coatings | Suitable for development of latent blocked-polyisocyanate crosslinkers used in thermosetting powder and industrial coating technologies. |
| Waterborne PU Systems | 3,5-DMP is documented in water-dispersible blocked-polyisocyanate technologies for waterborne crosslinking systems. |
| Polyurethane Adhesives | Relevant to adhesive formulations using latent or blocked isocyanate functionality and heat-activated crosslinking. |
| Textile & Synthetic Leather Chemicals | Blocked-isocyanate technology using DMP has been documented for textile finishing, textile coatings and polyurethane synthetic-leather systems. |
| Fertilizer & Nitrification-Inhibitor Development | 3,5-DMP and related salts have also been documented in nitrification-inhibitor applications for nitrogen fertilizers. |
Published blocked-isocyanate technologies include 3,5-DMP adducts ofHDI- and IPDI-based polyisocyanates. The suitability of a DMP grade should nevertheless be evaluated together with the specific isocyanate structure, NCO functionality, resin, catalyst and target curing profile.
3,5-DMP-blocked polyisocyanates have been developed as crosslinking components forone-component stoving coatings, including automotive clearcoat systems. DMP is particularly relevant where formulators are evaluating blocked-isocyanate chemistry, curing profile, coating resistance and yellowing performance.
3,5-DMP is also documented inwater-dispersible blocked polyisocyanatetechnologies. This makes it relevant to manufacturers developing waterborne 1K polyurethane crosslinkers, industrial coatings, textile treatments and other heat-activated aqueous systems.
Pyrazole-blocked isocyanate technologies containing 3,5-DMP have been described forpowder coating crosslinkers, textile finishing and coatings, fiber/leather crosslinking and polyurethane synthetic-leather systems. The appropriate formulation and curing conditions depend on the complete blocked-isocyanate system rather than the blocking agent alone.
There is no single universal deblocking temperature for every DMP-blocked isocyanate. The actual curing profile depends on the polyisocyanate structure, resin or polyol, catalyst, degree of blocking, film thickness and curing conditions. Published industrial DMP-blocked systems commonly evaluate curing in approximately the 130–140°C range, while other systems may behave differently. Customers should therefore evaluate the complete blocked-isocyanate formulation rather than rely on one fixed temperature value.
| Item | 3,5-DMP | MEKO |
| Blocking-Agent Type | Pyrazole | Oxime |
| Typical Role | Blocked polyisocyanates / PU crosslinkers | Blocked isocyanates and other coating applications |
| Can They Be Directly Substituted? | Not automatically.Deblocking behavior, coating compatibility, residual blocking agent, odor, yellowing and final film properties may differ. A formulation-specific evaluation is recommended. | |
Published fertilizer technologies have documented 3,5-Dimethylpyrazole and related salts as nitrification inhibitors for nitrogen-containing fertilizers. Commercial suitability should be evaluated according to the specific formulation, chemical form, target market and applicable fertilizer regulations.
Reference safety information classifies 3,5-Dimethylpyrazole as harmful if swallowed and as capable of causing skin and serious eye irritation. Avoid ingestion, dust exposure and contact with skin or eyes, and use appropriate engineering controls, protective gloves and eye / face protection.
Store in tightly closed containers under suitable cool, dry and protected conditions. Final storage, handling and transport requirements must follow the SDS applicable to the actual Royalchem commercial batch.
| Application | Blocked polyisocyanate, 1K PU, coating, adhesive, textile/leather, fertilizer or other use |
| Isocyanate / Resin System | HDI, IPDI, TDI, MDI or other system where applicable |
| Quality Target | Assay, moisture and any critical impurity requirement |
| Trial Requirement | Requested sample / evaluation quantity |
| Commercial Demand | Order quantity and estimated annual consumption |
| Logistics | Destination country and target delivery schedule |
Royalchem manufactures3,5-Dimethylpyrazole (3,5-DMP, CAS 67-51-6)with a current typical assay of≥99.5%for industrial B2B customers.
For faster technical and commercial matching, please provide:application, isocyanate or resin system, assay and moisture requirements, trial quantity, order quantity, estimated annual demand, destination country and target delivery schedule.
The applicablebatch COA, SDS, specification, packaging and logistics informationcan be confirmed according to the actual production batch and commercial order.
| What is 3,5-Dimethylpyrazole? | 3,5-Dimethylpyrazole, commonly abbreviated as 3,5-DMP, is a pyrazole compound with CAS 67-51-6. One of its major industrial uses is as an isocyanate blocking agent. |
| Who manufactures 3,5-Dimethylpyrazole? | Royalchem manufactures 3,5-Dimethylpyrazole for industrial B2B customers and supports trial evaluation, bulk purchasing and long-term supply programs. |
| What is 3,5-DMP used for? | Its principal industrial use is as a blocking agent for polyisocyanates in polyurethane and coating systems. Documented applications also include fertilizer nitrification-inhibitor chemistry. |
| Can 3,5-DMP be used with HDI? | Yes. Published technologies include 3,5-DMP-blocked HDI-based polyisocyanates. The final blocked-isocyanate formulation should still be optimized for the required curing profile and performance. |
| Can 3,5-DMP be used with IPDI? | Yes. DMP-blocked IPDI polyisocyanate systems are documented in coating technologies, including high-performance thermally cured applications. |
| What is the deblocking temperature of 3,5-DMP? | There is no universal value for all systems. The apparent deblocking and curing profile depends on the polyisocyanate, resin or polyol, catalyst, degree of blocking and curing conditions. Formulation testing is recommended. |
| What is the difference between 3,5-DMP and MEKO? | 3,5-DMP is a pyrazole-type isocyanate blocking agent, while MEKO is an oxime-type blocking agent. They can produce different deblocking behavior and coating properties and should not automatically be treated as direct replacements. |
| Can 3,5-DMP be used in waterborne polyurethane systems? | 3,5-DMP is documented in water-dispersible blocked-polyisocyanate technologies and is relevant to manufacturers developing waterborne heat-activated polyurethane crosslinkers. |
| Can 3,5-DMP be used in automotive coatings? | Published industrial technologies have used DMP-blocked polyisocyanates in one-component stoving coatings and automotive clearcoat systems. |
| Can 3,5-DMP be used in powder coatings? | Yes. Pyrazole-blocked isocyanate crosslinkers containing 3,5-DMP have been documented for thermosetting powder-coating technologies. |
| Can 3,5-DMP be used in textile or synthetic-leather systems? | Published technologies include 3,5-DMP-blocked isocyanates for textile finishing, fiber/leather crosslinking and polyurethane artificial-leather systems. |
| Is 3,5-DMP a nitrification inhibitor? | 3,5-DMP and related salts have been documented in fertilizer nitrification-inhibitor applications. Commercial use should be evaluated according to the specific formulation and target-market regulations. |
| Is 3,5-DMP the same as DMPP? | No. This product is 3,5-Dimethylpyrazole, CAS 67-51-6. DMPP commonly refers to 3,4-Dimethylpyrazole Phosphate, which is a different chemical product. |
| What information should I provide for a bulk quotation? | Please provide the target application, isocyanate or resin system, required assay and moisture, sample quantity, commercial order quantity, estimated annual consumption, destination country and requested delivery schedule. |
