Borosilicate glass syringe with cone coating that increases surface roughness
A syringe made of borosilicate glass and having a cone for fastening or mounting of transfer adapters and needles is provided. The cone includes a coating that increases roughness. The coating has structure-forming particles are embedded in a glass matrix and is free of Pb, Cd, Hg and Cr VI .
1. A syringe comprising:
a cylinder for accommodating a liquid; and
a cone comprising borosilicate glass having a thermal expansion in the range from 20 to 300° C. of less than 6·10 −6 /K, wherein the cone encloses an outlet channel and includes an outside surface having a coating, and wherein the coating has an increased roughness compared to the outside surface and comprises a glass matrix with structure-forming particles embedded therein.
2. The syringe according to claim 1 , wherein the coating has a roughness of R q (rms) between 0.3 and 2 μm.
3. The syringe according to claim 1 , wherein the coating has a roughness of R q (rms) between 0.5 and 1.8 μm.
4. The syringe according to claim 1 , wherein the coating has an average layer thickness from 0.5 to 20 μm.
5. The syringe according to claim 1 , wherein the glass matrix has a viscosity of less than or equal to 10 6 dPas below 700° C.
6. The syringe according to claim 1 , wherein the structure-forming particles are ceramic or glass particles having an average particle size (d 50 ) from 0.2 to 5 μm.
7. The syringe according to claim 1 , wherein the structure-forming particles make up a proportion of between 1 and 30% by weight of the coating.
8. The syringe according to claim 1 , wherein the structure-forming particles comprise a material having a thermal expansion in the temperature range from 20 to 300° C. of less than 8·10 −6 /K.
9. The syringe according to claim 8 , wherein the glass matrix comprises a material having a thermal expansion of less than 7.5·10 −6 /K in the temperature range from 20 to 300° C.
10. The syringe according to claim 9 , wherein the glass matrix comprises a material having a thermal expansion of less than 7·10 −6 /K in the temperature range from 20 to 300° C.
11. The syringe according to claim 1 , wherein the glass matrix comprises a material having a thermal expansion of less than 7.5·10 −6 /K in the temperature range from 20 to 300° C.
12. The syringe according to claim 11 , wherein the glass matrix comprises a material having a thermal expansion of less than 7·10 −6 /K in the temperature range from 20 to 300° C.
13. The syringe according to claim 1 , wherein the glass matrix comprises 40 to 75% by weight of Bi 2 0 3 , 3 to 20% by weight of B 2 0 3 , and 10 to 30% by weight of SiO 2 .
14. The syringe according to claim 1 , wherein the glass matrix comprises 15 to 48% by weight of ZnO, 8 to 40% by weight of B 2 0 3 , and 8 to 52% by weight of SiO 2 .
15. The syringe according to claim 1 , wherein the coating is symmetrically disposed around the outside surface.
16. The syringe according to claim 15 , wherein the coating has a width of between 2 and 10 mm.
17. The syringe according to claim 1 , wherein the borosilicate glass has a thermal expansion in the range from 20° C. to 300° C. of 4.5·10 −6 /K to 5.5·10 −6 /K.
18. The syringe according to claim 1 , wherein the borosilicate glass has a thermal expansion in the range from 20° C. to 300° C. of less than 5.0·10 −6 /K.
19. The syringe according to claim 1 , wherein the syringe comprises a total of less than 100 ppm of Pb, Cd, Hg and Cr VI .
20. The syringe according to claim 1 , wherein the syringe comprises a total of less than 1000 ppm of Pb, Cd, Hg and Cr VI .
21. The syringe according to claim 1 , wherein the coating does not completely cover the cone.
22. The syringe according to claim 1 , wherein the outside surface of cone has the coating in a manner that provides coated areas and island-like subregions that are free of the coating.