Features: HDI Biuret, Flexibility, Adhesion, Auto Refinish
Application: Automotive OEM & Refinish
| Property | Value |
|---|---|
| Type | HDI Biuret |
| Solid Content | 75 ± 1% |
| NCO Content | 16.5 ± 0.5% |
| Free HDI Monomer | ≤ 0.5% |
| Viscosity | 210 ± 90 cps @ 25°C |
Specifications are based on Dongsen’s current approved product data source. Appearance, carrier and solubility are not published here pending approved grade-specific documentation.
HDX-175MPX can be used as the polyisocyanate hardener component in 2K automotive refinish clearcoat and primer formulations.
The confirmed application evidence covers both clearcoat and primer use within Dongsen’s automotive refinish formulation direction.
Consider HDX-175MPX when evaluating an HDI-biuret hardener for a 2K automotive refinish clearcoat or primer formulation where the confirmed flexibility and adhesion selection direction fits the formulation requirement.
HDX-175MPX uses HDI biuret chemistry and has confirmed automotive refinish clearcoat and primer application evidence. Refer to Technical Data for the complete published numeric specifications.
HDX-100 may also be reviewed as another HDI-based grade within Dongsen’s automotive refinish product direction. Final grade selection should be based on the customer’s resin system and target requirements.
Share your resin system, application method and target coating requirements for formulation-specific grade selection support.
HDX-175MPX is used as the hardener / crosslinking component in the confirmed 2K automotive refinish formulation direction.
Dongsen’s current guiding formulation includes the following approximate starting ratios:
These are formulation-guidance references rather than universal mixing ratios. Verify the applicable formulation guidance for the customer’s actual resin system before use.
HDX-175MPX has also been used in a real-world outdoor steel coating application.
Evidence status: Reference Only.
This field-use case supports technical discussion and evaluation of HDX-175MPX for outdoor steel coating systems, but it does not establish a universal performance claim or a formal Product Application mapping.
Final suitability should be evaluated in the customer’s actual coating formulation, substrate preparation, application process and exposure conditions.
For reference only. Product-specific technical validation is required.
What type of hardener is HDX-175MPX?
HDX-175MPX is an HDI biuret aliphatic polyisocyanate hardener.
What is the confirmed application of HDX-175MPX?
The confirmed application evidence covers 2K automotive refinish clearcoat and primer formulations.
Has HDX-175MPX been used for outdoor steel coatings?
Dongsen has a real-world outdoor steel coating application case for HDX-175MPX. This is currently treated as application-reference evidence rather than a universal performance claim. Formulation-specific testing is required.
What mixing ratio is used in the automotive refinish formulation reference?
Dongsen’s guiding formulation uses approximately 2:1 resin to hardener solution for clearcoat and approximately 4:1 for primer. These are formulation-specific references and should be verified for the customer’s actual resin system.
Can I request technical documents or formulation support?
Current document availability and formulation support can be confirmed directly with Dongsen according to the selected grade, application and market.
