Most people love Weck jars.  Not only are they the ultimate in recycling, being made entirely of glass, with the only single use piece being the rubber seal, they are also a very sturdy jar and attractive to boot!  Our Weck and Rex jars are genuine German manufactured goods and not inferior copies.

However on occasion, we get complaints to the effect: “My Weck lids are chipped around the top inner rim: this is dangerous.  How can you sell food safe jars that chip?”

When we ship Weck jars they are generally not pre-assembled with their lids and we pad them for shipping, first carefully checking the top and bottom of all lids for any chips or defects.  The rare cases of transit damage we see for these lids is usually restricted  to the outside edges of the lids or lids breaking completely in half,  if the shipping company is careless. Due to the way we package the lids with foam or bubble between each lid, we have not seen a case of chips to the inside of the lids being caused by transport.

What can and does cause nicking to the inside edge is the incorrect use of the stainless steel clamps.  The 2 most common errors are to put the clamps on upside down and /or to snap the clamps on the jars.  Even You-Tube incorrectly show the “correct” method as being to snap the clamps onto the jar.  However in our experience any sort of snapping, even if the clips are upright, can cause chipping to the lid.  Rather than snapping the clip on, you should position the top hook of the clamp against the inside edge of the lid and then stretch the bottom section of the clamp pulling it down to hook against the body of the jar.

Over time, the inner edges may nevertheless get chipped just from being used in the dishwasher, knocking against other lids, etc.  As the seal of the jar is on the underside of the lid, the critical part of the lid to check for nicks and chips is the underside and any chips in that section that overlap the seal have the potential to compromise the seal and so lids thus damaged should be discarded.

There should be no reason to be running your fingers along the outside inner edge so we do not subscribe to the view that this makes the lids hazardous (you could similarly cut yourself running your fingers along the metal edge of a mason preserving lid) and if you are concerned about any sharp edges we recommend using a small file to remove any particles of concern.

The clamps may be considered tricky to use but they do solve the problem of other closure systems, namely how tight to screw the lid or band onto the jar.  The tension on the clamp provides sufficient strength to hold the glass lid in place on top of the seal whilst still allowing air to vent out of the jar whilst it is being heat processed (waterbath or pressure canner).

If you are using Weck jars for storage purposes, we also stock plastic Keep Fresh lids and wooden lids with an inbuilt seal, both of which provide a more “user friendly” approach to keeping your goods sealed in an airtight way.