Supermarket shelves have both in abundance.
I would have thought one or other would have an overall advantage and led to the demise of its rival.
What factors are at work here?
Supermarket shelves have both in abundance.
I would have thought one or other would have an overall advantage and led to the demise of its rival.
What factors are at work here?
All right, I'll bite.
Glass is needed if the product is poured hot into the jar and then allowed to cool, eg jam.
But, you can get mayonnaise in both glass and plastic jars/squeezy bottles. Is that a cold pour, then?
I personally feel milk tastes wrong in plastic bottles and also seems to go off if left in, say a porch quicker in plastic as glass holds cold better so to speak. I also wonder why soup comes in cans. After all you pour it out to use it. Brian
Soup is cooked at 130degC or more after being sealed in the can.
Neither is best for all products. Some of the things that are taken into account are:
Permeability: PET is permeable to oxygen. Glass is not. That is why expensive salad and cooking oils come in glass bottles. Only cheaper oils, which it is assumed will not be stored for extended periods, come in plastic bottles.
Strength and weight: Glass is heavy. Glass capable of withstanding pressure is particularly heavy. Heavy products require more fuel to move about and may limit the quantity that can be carried in one vehicle. Hence, many fizzy drinks come in PET bottles.
Shipping volume: Plastic bottles are thinner, so the same quantity of product can be packed into a smaller space, or more product can be packed into the same space. Smaller shipping volumes mean fewer lorries are needed to move the huge amount of products travelling on our roads every day.
Safety: Glass is brittle and is more likely to break if dropped. Plastic is safer and suffers less loss due to accidental damage.
Image: Glass is seen by consumers as more up-market or more traditional, so premium products and products trying to present a traditional image are normally presented in glass bottles, rather than in plastic.
It's interesting that PET is permeable to oxygen, but not CO2.
More specifically, it's boiled in the jars before the lids seal, to generate the sterile sealed environment (and the vacuum).
It may still be pasturised after bottling, but not at such a high temperature.
The canning process sterilises things. So they have a nearly indefinite life.
Fresh soup usually comes in a container like other fresh liquids. Kept chilled before sale.
It is permeable to both, but CO2 loss is a slower process, so it does not really matter for most fizzy drinks.
You can buy jam in a plastic squeezy bottle these days.
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That will require either extra preservatives, or a high sugar content (lower fruit content) to act as a preservative (or both). That would also make it cheaper to manufacture, and most people would regard it as an inferior product due to lower fruit content/taste.
Rubbish. Fresh soup comes from a pan on SWMBO's hob.
We will be getting free electricity soon with British Gas every Saturday 0900-1700. Free saunas, washing machines and batch cooking a gogo.
That's what she tells you.
Rubbish. Fresh soup comes from a pan on MY hob.
Yes, I have made the warmandwetware not just claiming the hardware.
(It is d-i-y, after all.)
you don't use heat to make mayonnaise, it's just a cold mix emulsion.
I do find it strange that I can only buy Carrot juice in heavy glass bottles, when all other juices are in Terra packs or plastic bottles .... so marketing must play in this as well ... perceived value maybe?
yet still put on a use by date ?
Exactly. I think Aldi do carrot juice cartons.
NT
It's a best before date on cans. Which in 99% of cases is meaningless. Sponge and milks are the only things I'm aware of that suffer over time in cans, sponge slowly collapses, milk fat settles.
NT
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