Plastic and glass can be used to make milk bottles. The figure below shows the percentage of milk bottles made from glass between 1975 and 2010. The table below gives information about milk bottles. Evaluate the production and use of bottles made from soda-lime glass and those made from HD poly(ethene). Use the information given and your knowledge and understanding to justify your choice of material for milk bottles. – 6192

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1. Glass is made in 2 stages, including heating sand, limestone, and sodium carbonate.
   HDPE plastic is made in 3 stages, including cracking naphtha to get ethene, then polymerising it.
   Glass has fewer stages, so it might be made quicker, but it needs a higher temperature, so it uses more energy.
   Glass bottles can be reused, but it costs more to collect and clean them.
   Plastic bottles come in a wider range of sizes.
   Both use limited raw materials, but glass can use more recycled material, which helps save resources.
   Also, recycled glass can be used to make other glass products.

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