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what is major difference b/w cp plastic & pp plastic? can we use pp inplace of cp plastic? Basic difference
PVC is the most common plastic used in book covering materials, and has been used for many years. Polypropylene has become more common recently. Both of these plastics have different handling characteristics. PVC is generally considered to be easier to fold and to conform to the shape of a book more readily, while polypropylene is usually a little more rigid. Sometimes PVC will stick to itself, particularly in warmer weather. Polypropylene is well known for it's non stick characteristics, in fact it is difficult to glue and even permanent marker can be removed from it, giving it superior life and resistance to damage and marking. Polypropylene is also acid free, and is considered to be an archival plastic. PVC is known to have a low level of acidity. PVC is cheaper than PP.
PVC is the most common plastic used in book covering materials, and has been used for many years. Polypropylene has become more common recently. Both of these plastics have different handling characteristics. PVC is generally considered to be easier to fold and to conform to the shape of a book more readily, while polypropylene is usually a little more rigid. Sometimes PVC will stick to itself, particularly in warmer weather. Polypropylene is well known for it's non stick characteristics, in fact it is difficult to glue and even permanent marker can be removed from it, giving it superior life and resistance to damage and marking. Polypropylene is also acid free, and is considered to be an archival plastic. PVC is known to have a low level of acidity. PVC is cheaper than PP.
PP ; see related link .
Chemical blowing agents are used to produce cellular HDPE, PP, ABS,PS, PVC, and EVA. Source: Industrial Plastics: Theory and Applications (text book)
Many material can be used inection machine. For standard machine, PP,PE,ABS are ok. For PC,PMMA, PET, PVC, you need injection machine with special screw and barrel.
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The number a person is looking for on a plastic container is located inside the triangle. If you didn't know, the number indicates the type of plastic material used to make that specific bottle. There are varies types of materials 1-7. 1 - PET, polyethlyene terephthalate 2 - HDPE, high-density polyethylene 3 - PVC, polyvinyl chloride 4 - LDPE, low-density polyethylene 5 - PP, polypropylene 6 - PS/PS-E, polystyrene / expanded polystyrene 7 - OTHER, resins or multi-materials
You think probable to polypropylene.
PP ; see related link .
Most Tupperware products are made of LDPE or PP
Thermoplastic and thermoset materials both fall under the broad category of Polymers. The biggest difference between a thermoplastic and thermoset is that a thermoplastic can be recycled. Whereas a thermoset irreversibly cure. Thermoplastic: PE, PP, PVC. Thermoset: Bakelite, Epoxy.