I think they are adopting the same policy as the hardhat manufacturer which also have a 3 year 'lifetime'
I am an engineer and a physicist rather than a chemist but the polymer that provides the strength will decay over time when exposed to the air and Sun so it is going to degrade no matter how well you store it. My guess is the 3 years is the age where with the thousands they produce they start to see a few failures. It is a bit like best before dates on food.
It is all down to statistics and liability lawyers.
I would use your judgement
If it looks good but is starting to look a bit scruffy get a new one and use the old one as a backup.
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When it's not longer fit for purpose i.e worn strap or buckle. Can't imagine this happening for a very, very long time!
Well they would say that wouldn't they? It boosts sales.
I think it depends on how much it's used, how much it's looked after, whether or not it's showing signs of wear.
I's hardly going to de-grade when it's still in the box or protective pod is it?
I think you need to use your own judgement whether of not you need to replace depending on the above factors.
I am an engineer and a physicist rather than a chemist but the polymer that provides the strength will decay over time when exposed to the air and Sun so it is going to degrade no matter how well you store it. My guess is the 3 years is the age where with the thousands they produce they start to see a few failures. It is a bit like best before dates on food.
It is all down to statistics and liability lawyers.
I would use your judgement
If it looks good but is starting to look a bit scruffy get a new one and use the old one as a backup.