Ks-Tek 20 mm Crimp Cap with Natural PTFE/Blue Silicone Septa (Silver) 100pk

I LOVE LOVE LOVE these! Makes things so much easier when capping my vials. two downsides, the chemicals used in the vials will melt silicone over time which is very unsafe. these hafe a PTFE paper type backing on the bottom of the silicone stoppers though so they shouldn't really come into contact with the oil from the vials. That said, what happens when you've used the vial multiple times and now have poked multiple holes into that ptfe bottom? Also, they don't have caps. give me a flip cap on these that remain until the vial is ready for usage. id much rather the extra protection. Aside from this, the needles feel wonderful gooing thrugh this, the self healing is no issue and immediately self heals your stab port. they feel and look nice and just well. made. I absolute love love love these. Please give us some in a much better stopper material that will still work with solvents like Benzyl Benzoate for the long term

Perfect replacement caps for our vials, very similar to a type and style we were already using. Creates a strong seal (with the right crimping tool). Easy to use. We are using these for scientific samples so we need them to be spill proof and they don't not leak. They can be removed when we need to refill the vials so we are very happy with this item so far.

There's times when the silicone gets stuck in the needle and must siphoned out. These still work better than the rubber ones though

Las uso para tapar frascos con aceites