7 Types of Coating Solvents for PU Coating Formulation
Updated: 2026
7 Types of Coating Solvents for PU Coating Formulation
Quick Answer: Coating solvents help dissolve, disperse, or reduce coating raw materials before application. The seven practical families are aliphatic hydrocarbons, aromatic hydrocarbons, terpenes, alcohols, ketones, esters, and glycol ethers or ether esters; selection should be checked with the resin, isocyanate hardener, process, and application target.
Need Help Matching Solvent Choice with PU Hardener Selection?
Solvent choice should not be reviewed alone. In PU coating formulation, the solvent package, resin, hardener or crosslinker, application method, and curing conditions need to work together. Dongsen supports formulators with isocyanate hardener and polyisocyanate crosslinker raw-material selection.
What Are Coating Solvents?
Coating solvents are liquid components used to adjust a formulation before application. They can influence viscosity, wetting, evaporation profile, sprayability, and compatibility, but the final result depends on the complete formulation.
Dongsen does not supply finished coatings, finished resins, or coating solvents. Dongsen manufactures isocyanate hardener, blocked isocyanate crosslinker, waterborne isocyanate hardener, and related polyurethane raw materials. In this article, solvents are discussed as formulation and carrier-solvent selection factors.
7 Types of Solvents Used in Coatings
Aliphatic hydrocarbons are often reviewed for moderate solvency and viscosity reduction. They are not the first Dongsen-specific carrier example in the current reference set, so compatibility should be tested before use.
Aromatic hydrocarbons generally offer stronger solvency than many aliphatic families. In Dongsen solvent-based blocked examples, Solvent Naphtha 100 appears as a documented carrier for selected grades.
Terpene solvents are specialty options and are not a standard Dongsen carrier example in the current reference set. Treat them as formulation-screening candidates, not default choices.
Alcohols are polar, hydroxyl-bearing solvents. In PU systems, they should be reviewed carefully because the resin, hardener chemistry, and reaction environment matter.
Ketones and esters are common oxygen-containing solvent families for coating formulation. Dongsen examples include ester carriers such as butyl acetate or ethyl acetate for selected grades; the current TDS should control the final decision.
Glycol ethers and ether esters help tune flow, wetting, and evaporation balance. Dongsen examples include PM and PMA carrier directions for selected blocked or water-dispersible systems.
For inquiry preparation, it is usually more useful to send your current solvent package than to ask for a generic solvent recommendation. Dongsen can then review whether the requested hardener or crosslinker direction fits the system you already use.
Side-by-Side: Solvent Family vs. Dongsen Selection Note
| Solvent Family | Dongsen-Relevant Example | Buyer Review Point |
|---|---|---|
| Aromatic hydrocarbons | Solvent Naphtha 100 in selected solvent-based blocked grades | Check resin fit, baking window, and current TDS. |
| Esters | Butyl acetate or ethyl acetate in selected grade families | Confirm water content, grade quality, and compatibility. |
| Glycol ethers / ether esters | PM or PMA in selected blocked or water-dispersible systems | Match the carrier direction to the system design. |
| Aliphatic hydrocarbons, terpenes, alcohols, ketones | Use only where the grade documentation and formulation test support it | Do not assume suitability from solvent family name alone. |
Carrier examples above are selection references. Final use must be confirmed against the current TDS/COA and formulation testing.
For purchasing teams, this structure also keeps the inquiry practical: the solvent family explains the formulation context, while the hardener or crosslinker category tells Dongsen which technical document and sample direction to prepare first, without turning the article into a full technical datasheet.
A practical shortlist should start with the solvent package already used by the buyer, then narrow the hardener or crosslinker direction. This reduces trial work and keeps the conversation focused on grades that can be tested under real production conditions.
Application Selection Guide for Coating Manufacturers
Wood and furniture coatings: Review solvent evaporation, appearance, resin compatibility, and the selected isocyanate hardener together. For background, see wood coating applications.
Industrial and automotive coating systems: Solvent choice may affect spray viscosity and workflow. Match the solvent package with the resin, hardener or crosslinker, and expected application conditions; see automotive refinish and industrial coating systems.
Baking systems: Blocked isocyanate crosslinkers should be compared by resin fit, carrier direction, and baking conditions. Review solvent-based blocked isocyanate options only with the current TDS.
Waterborne PU systems: Waterborne does not always mean water-only. Co-solvent or dilution review may still be needed. For hardener selection, compare your process with a water-based isocyanate hardener after checking documentation.
Footwear and adhesive systems: Some polyurethane adhesive hardener grades may already be supplied in an ester carrier. In these cases, use the supplier documentation as the baseline and avoid changing the carrier without compatibility testing.
Hybrid and Related Dongsen Solutions
Solvent selection often points to a larger question: which reactive raw-material direction fits the system?
- Solvent-based isocyanate hardener: for selected 2K PU coating or adhesive systems.
- Blocked isocyanate crosslinker: for 1K baking systems where crosslinking is heat activated.
- Waterborne isocyanate hardener: for water-dispersible 2K PU systems.
- Moisture cured prepolymer: for applications where moisture reaction drives cure.
For more background, read 3 types of polyurethane curing agents and all about blocked polyurethane coatings.
Ready to Review Your PU Solvent System?
Before sending an inquiry, prepare the resin or binder type, current solvent blend, target viscosity, application method, curing route, and any known compatibility issue. These details help Dongsen respond with a narrower testing direction instead of a broad product list.
Send Dongsen the key formulation details below. The inline form is the fastest place to request TDS, sample, quotation, or suitable-grade support.
Send Your Coating Formulation Requirement
Please share your solvent package, resin type, application, current formulation direction, estimated quantity, and documentation request. Dongsen will review the information and suggest a suitable raw-material direction for testing.
- TDS request for relevant hardener or crosslinker grades
- Sample support for formulation screening
- Quotation based on quantity and packaging needs
- Grade selection support by application scenario
- Technical discussion for solvent compatibility questions
FAQ: Coating Solvents and PU Hardener Selection
What are the 7 types of solvents used in coatings?
The seven practical coating solvent families are aliphatic hydrocarbons, aromatic hydrocarbons, terpenes, alcohols, ketones, esters, and glycol ethers or ether esters.
Does Dongsen manufacture coating solvents?
No. Dongsen manufactures isocyanate hardener, polyisocyanate crosslinker, blocked isocyanate crosslinker, waterborne isocyanate hardener, and related polyurethane raw materials.
Which solvent families are most relevant when selecting Dongsen hardeners?
Aromatic hydrocarbons, esters, glycol ethers, and ether esters are especially relevant because documented Dongsen examples include Solvent Naphtha 100, butyl acetate, ethyl acetate, PM, and PMA.
How should solvent choice be evaluated in PU coatings?
Evaluate the solvent package together with the resin, hardener or crosslinker, viscosity target, application method, drying profile, and curing or baking conditions.
What information should I send Dongsen for grade selection support?
Send your resin or binder type, solvent package, coating application, curing or baking conditions, target use scenario, expected quantity, and documentation request.