National High-Tech Enterprise and "Specialized & Sophisticated" SME dual certification — 12 years of metalworking media expertise trusted by leading manufacturers.
Four provincial-level certifications reflect continuous innovation and growth in metalworking media.




Dot-Trademark digital brand certification and official website certification — scan to verify the Dourland brand.



End-to-end capabilities from formulation R&D to on-site service support the stable quality of every drop.
In-house lubricant laboratory and R&D team with controllable formulations and custom development.
Modern blending and filling lines — 68 models with flexible scheduling and stable delivery.
Full-process inspection: viscosity, concentration, rust and cooling performance tested batch by batch.
24-hour response with on-site process engineering support.
CNC Machining Workshop
Oil Testing Laboratory
Automated Filling Line
Precision Machining SiteFactory and laboratory visits are welcome