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Whilst you're perusing fireworks you'll see reference to 1.3g or 1.4g at some point. So what is the difference? The reference to 1.3g and 1.4g purely relates to the storing and transportation of fireworks. it's as simple as that..... well not exactly. Nothing in fireworks is simple. All fireworks have a Hazard type and this is defined on the hse...

Compound fireworks are relatively new to us. Sorry to bore you again with a bit of legalization but it's fireworks, we get used to it.   All fireworks are controlled by various parts, weight, size, etc., and currently, under CE regulations no individual firework can contain more than 1000g of explosive powder and no tube can be more than 30mm...