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Back in the early days of the boycott I didn’t think of glass jars as an issue – after all they weren’t  plastic so it wasn’t a problem. Of course it was you numbskull.

Look at the lids – that white sticky stuff – the seal? That’s plastic that is…

Googling around and I found this from the containers and packaging site

“Plastisol liners are one method that helps seal metal closures onto containers. Plastisol is a PVC gasket that is used in metal continuous thread and lug (sometimes called twist) closures. It is normally applied to metal lids in a ring shape on the inside of the lid at the point where it will match up with the landing of the bottle.

Plastisol material starts out as a solid. After being heated properly, Plastisol becomes liquidus and forms around the landing of the container that is being sealed. When the material cools it begins to cure, or solidifies, which then creates a tight vacuum seal.”

PVC? Not sure I like that idea.There’s lots more information here on the poison that is  PVC. And despite the industry claiming it is perfectly safe, research is being done into alternatives.  Why you might ask – and so do I. Answers? I have none but”The environmentalist group Greenpeace has advocated the global phase-out of PVC because they claim dioxin is produced as a byproduct of vinyl chloride manufacture and from incineration of waste PVC in domestic garbage.”

 

One alternative could be this from k-online

The development of PVC-free compounds for lug-type twist closures and the corresponding production processes took place before the background of the 4th Amendment 2007/19/ EC of the Plastics Directive 2002/72/EC, which no longer permits the use of some phthalates as plasticisers in PVC-based seals of closures that come into contact with food. This marked an end to the exceptions with which EU and national authorities made allowances for the industry’s difficulties in finding solutions to the migration problems. Accordingly, manufacturers of metal lug closures, food producers, bottlers and retailers are under a great deal of pressure to bring products to market that are environmentally friendly, user-friendly and, above all, comply with statutory regulations.

This TPE is free of plasticisers and PVC and is useable with a wide range of lug-type twist caps (from 38 to 82 mm in diameter). Besides those properties that are indispensible in a sealant – good processability, pasturisability, compliance with the law – this new PVC-free compound ensures compliance with the valid migration thresholds even for oily foods with longer shelf-lives (e.g., antipasti). This was confirmed * in multiple individual tests. Thus vacuum twist seals with sealant compounds by Actega DS are the preferred solution for low-migration food storage and help food industry customers keep their products from becoming entangled in the problems associated with unhealthy packaging. Moreover, the new product also addressed the need to maintain a reliable vacuum until the closure is first opened and user-friendly resealability.

So I try not to use jars.

Look here for other sneaky plastic.

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