Polyfluoroalkyl substance free caps
The present disclosure provides for a liner comprising a septum and a layer, the layer comprising a thermoplastic polymer, wherein the septum comprises an elastomer and the septum is coupled to the layer comprising the thermoplastic polymer. The present disclosure also provides for a cap assembly comprising the liner as disclosed herein and a cap, wherein the cap is coupled to the liner. Further, provided herein is a cap and vial assembly comprising the cap assembly as disclosed herein and a vial, wherein the cap assembly is coupled to the vial. Also provided herein is a method of testing water quality in a sample using an analytical instrument, wherein the sample is contained within a container comprising the liner as disclosed herein, the cap assembly as disclosed herein, or the cap and vial assembly as disclosed herein, the method comprising penetrating the liner with a syringe to remove a portion of the sample and testing the portion of the sample using the analytical instrument.
1. A cap assembly free of polyfluoroalkyl substances (PFAS) comprising:
a liner comprising a septum and a layer, wherein the layer comprises a first thermoplastic polymer, wherein the septum comprises a cured elastomer, and wherein the septum is coupled to the layer comprising the first thermoplastic polymer, wherein the liner is free of PFAS; and
a cap, wherein the cap is coupled to the liner, further wherein the cap has an average characteristic dimension of from 9 millimeters (mm) to 30 mm, further wherein the liner has an average characteristic dimension of from 9 mm to 30 mm;
wherein the septum couples directly with the cap without an intervening thermoplastic layer or adhesive.
2. The cap assembly of claim 1 , wherein the cap comprises polypropylene.
3. The cap assembly of claim 1 , wherein the cap comprises screw threads.
4. The cap assembly of claim 1 , wherein the cap comprises a metal.
5. The cap assembly of claim 4 , wherein the metal comprises aluminum.
6. The cap assembly of claim 1 , wherein the cap has a cross-sectional shape, wherein the cross-sectional shape is substantially circular.
7. The cap assembly of claim 1 , wherein the cap has an average characteristic dimension of from 9 mm to 30 mm.
8. A cap and vial assembly comprising the cap assembly of claim 1 , and a vial, wherein the cap assembly is coupled to the vial.
9. The cap and vial assembly of claim 8 , wherein the vial comprises glass or a plastic.
10. The cap and vial assembly of claim 8 , wherein both the cap and the vial comprise screw threads such that the cap assembly is configured to be coupled to the vial with a screw mechanism.
11. The cap and vial assembly of claim 8 , wherein the cap assembly is configured to be coupled to the vial with a crimping mechanism or a snap mechanism.
12. The cap assembly free of polyfluoroalkyl substances (PFAS) of claim 1 , wherein the elastomer comprises silicone rubber.
13. The cap assembly free of polyfluoroalkyl substances (PFAS) of claim 1 , wherein a liquid disposed on the thermoplastic polymer has a contact angle of from 0° to 90° with the first thermoplastic polymer.
14. The cap assembly free of polyfluoroalkyl substances PFAS) of claim 1 , wherein the first thermoplastic polymer comprises polypropylene.
15. The cap assembly free of polyfluoroalkyl substances (PFAS) of claim 1 , wherein the liner has a thickness and a cross-sectional shape, wherein the cross-sectional shape is substantially circular.
16. The cap assembly free of polyfluoroalkyl substances (PFAS) of claim 1 , wherein the liner has an average characteristic dimension of from 9 millimeters (mm) to 30 mm.