Kilner
Kilner's Clip Top and swing-top jars seal glass-on-glass with a natural rubber ring and a stainless clip, so nothing plastic touches the contents. Their screw-top and twist-seal ranges do use lined or plastic lids, so plastic content varies by product line - the Clip Top range is the fully plastic-free one.
How clear are their specs?
States the jars are soda-lime glass, the clip is stainless steel, and the replacement seals are natural rubber (and should be hand-washed, not dishwashed, and replaced periodically).
Lead testing disclosure
Only generic marketing language found ("BPA free," glass framed as the "safest option") on Kilner's own site/blog - no named lab, no test numbers, no cited standard, and no dedicated testing/safety page.
- manufacturer https://www.kilnerjar.co.uk/blog/spring-clean-with-kilner generic "BPA free" / glass-is-safer marketing language, no supporting test data
