Closures with Pre-Cut septa

Closures using pre-cut septa are available in a variety of caps and seals. The pre-cut septa are manufactured by making a slit in the silicone layer, but leaving the PTFE barrier uncut.
Less pressure is required for the autosampler needle to penetrate the pre-cut septa as compared to non-slitted septa, resulting in fewer bent and/or broken needles. The uncut PTFE layer provides a better seal than other commercially sold slitted septa until the needle punctures the septa. This design provides the needle with a larger target area for penetration even when the needle doesn′t come down in the center of the septa.
The products are available in four closure styles thatn can be used with crimp style and screw thread vials. They are each sold in packs of 100 each.
9 mm blue polypropylene cap with pre-cut septa

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29491-U Closures with pre-cut septa, pk of 100 size 11 mm, Snap cap, soft version, blue polyethylene, red PTFE/silicone, thickness 1.0 mm
29492-U Closures with pre-cut septa, pk of 100 size 11 mm, Snap cap, soft version, transparent polyethylene, red PTFE/silicone, thickness 1.0 mm
29493-U Closures with pre-cut septa, pk of 100 size 11 mm, Snap cap, blue polyethylene, red PTFE/silicone, thickness 1.0 mm
29494-U Closures with pre-cut septa, pk of 100 size 11 mm, Snap cap, transparent polyethylene, red PTFE/silicone, thickness 1.0 mm
29495-U Closures with pre-cut septa, pk of 100 size 20 mm, UltraClean, Magnetic cap, gold stainless steel (crimp top), transparent PTFE/silicone, thickness 3.0 mm
29496-U Closures with pre-cut septa, pk of 100 size 20 mm, Magnetic crmp top cap, UltraClean, red PTFE/silicone, thickness 1.5 mm
29497-U Closures with pre-cut septa, pk of 100 size 18 mm, Magnetic screw thread cap, UltraClean, red PTFE/silicone, thickness 1.5 mm
29498-U Closures with pre-cut septa, pk of 100 size size 9 mm, blue polypropylene, red PTFE/silicone, size × thickness × 1.0 mm
29499-U Closures with pre-cut septa, pk of 100 size size 9 mm, transparent polypropylene, red PTFE/silicone, thickness 1.0 mm