Shenyang crst chemical researching institute was founded in 1998, beining an early unit which pursued in computer printing consumable material with abundant technology. We successfully researched protective film, cleaning agent, printing ink, ink filter, printhead cleaing machine, printhead tester in years and developed cleaning and repairing technology concerning printheads of xaar128, 128, vt 500, 3300, epson 4, 5 and spectra 256. the main types of printheads we have cleaned and repaired and sticking film are below: 1. xaar128, 126, 500, 382 2. vt5300, 3360 3. konica512, 256 4. seiko510, 255 5. ink filter 6. epson 4 and 5 7. cleaning solution 8. printhead tester and printhead cleaing machine 9. the ink includes general ink, uv ink and poor solution and water ink. 10. polaris