Let get more familiar with plastic raw materials and their difference. The fact that polypropylene (PP) is a saturated polymer and polyethylene terephthalate (PET) is an unsaturated polymer is the primary distinction between the two types of plastic. Polypropylene is what the abbreviation PP stands for, while polyethylene terephthalate is what PET stands for. These are examples of polymer materials, which are constructed from several monomers. The repeating unit of the polymer is represented here by the monomer that was utilized in the production of the polymer material. Propylene is the component that makes up the PP's monomer. Ethylene terephthalate is represented by the repeating unit found in PET. What exactly is PP? In the field of polymer chemistry, the term polypropylene (or PP for short) refers to polypropylene. It is a polymer substance that has repeating units of propylene inside its structure. This substance is also known as "polypropene" in some circles. This polymer can be represented by the generic formula [CH (CH3) CH2] n. Polypropylene is a thermoplastic polymer that may be used for both the production of fibers and plastics. It is within the category of thermoplastic polymers. The ability of thermoplastic polymers to be reshaped into multiple forms after being heated is one of their defining characteristics. The substance in question becomes malleable after being heated. In addition, this polymer substance is produced using a process known as addition polymerization. The most common usage for polypropylene is in the production of packaging material. 
Because it is one of the plastics that can be recycled the most, PP is relatively inexpensive. This substance's polymer structure, in contrast to that of its monomer, does not contain any double bonds; as a result, the material can be classified as a saturated polymer. Isotactic, Atactic, and Syndiotactic are the three forms of tacticities that may be seen in polypropylene when looking at its tacticity. Syndiotactic tacticity is the least common of the three. The structure of an isotactic polymer has polymer chains that include the pendant group on the same side. The structure of an atactic polymer consists of polymer chains that each have a methyl group inserted into them in a disorganized fashion. In the structure known as syndiotactic, the methyl groups are arranged in an alternating pattern between two different positions. The most valuable characteristics of polypropylene (PP) are its low density, outstanding transparency, capacity to be recycled, and stretchability. In addition, some popular applications of polypropylene include the creation of films for the packaging of food, applications in the textile sector (such as the production of carpets and other consumer goods), and applications in other industries. What exactly is PET? In the field of polymer chemistry, the abbreviation PET refers to the compound known as polyethylene terephthalate. It is a type of polymer material called ethylene terephthalate, and its chemical formula is (C10H8O4)n. The substance is composed of repeating units of ethylene terephthalate. 
Thermoplastic resin is the appropriate classification for this type of material. One variety of polyester is known as PET. Typically, ethylene glycol and dimethyl terephthalate are the two components used in the production of PET (or terephthalic acid). During production, there are two distinct kinds of chemical reactions that take place. The transesterification process and the esterification reaction are the two reactions in question. PET has no discernible hue, and its typical morphology is that of a semi-crystalline solid. The manufacturing method used to create this material is directly related to how rigid it is. PET is rugged and resistant to the effects of impact. It does a very good job of preventing gas and moisture from passing through it. In addition to this, it is an effective barrier against alcohol and a number of other substances. On the other hand, when it is subjected to chloroform and toluene, it changes color and becomes white. Synthetic polymers make up the vast majority of PET production around the world. This polymer has many important applications, such as the production of soft drink bottles, the production of fibers for clothing in the textile industry, the production of containers for the storage of food and beverage, as a substrate in thin film solar cells, as a waterproofing barrier in undersea cables, and so on. Other applications include the production of containers for the storage of food and beverage. 
PET and PP plastic
What are the key differences between polyethylene terephthalate (PET) and polypropylene (PP) plastic? "PP" is the abbreviation that is used to refer to polypropylene, while "PET" is the abbreviation that is used to refer to polyethylene terephthalate. The fundamental contrast that can be made between these two kinds of polymers is that polypropylene (PP) is a saturated type of polymer while polyethylene terephthalate (PET) is an unsaturated type of polymer. [Case in point:] In addition, the manufacture of PP is performed through the addition polymerization of propylene, whereas the manufacturing of PET is accomplished through the condensation polymerization of ethylene glycol and dimethyl terephthalate. Both processes are described in more detail below. In addition, polypropylene can be used in the creation of films for the packaging of food, in the textile industry (for the production of carpets, etc.), in the production of consumer goods, and in a wide variety of other applications as well. In the meantime, polyethylene terephthalate (PET) is essential for the production of bottles for carbonated soft drinks, the production of fibers for clothing in the textile industry, the production of containers for the storage of food and beverages, as a substrate in thin-film solar cells, as a waterproofing barrier in undersea cables, and for a variety of other applications. PET is also essential for the production of fibers for clothing in the textile industry. The following infographic provides further contrasts in relation to the distinctions that can be made between PP and PET. A Brief Analysis of the Differences Between PP and PET The acronyms PP and PET, which stand for polypropylene and polyethylene terephthalate, respectively, are used to refer to these two types of plastic. The fundamental contrast that can be made between these two kinds of polymers is that polypropylene (PP) is a saturated polymer whereas polyethylene terephthalate (PET) is an unsaturated polymer. You are not the only one who finds all of the abbreviations that can be found on the bottom of plastic cups and takeout food containers to be bewildering; in fact, you are in excellent company. 
These abbreviations can be found on the bottom of cups made of plastic and containers used to hold takeaway meals. Consumers as a whole may be interested in learning the distinctions, but if you are contemplating the launch of a company that will make use of the aforementioned types of plastic containers, in particular takeout containers for foods or drinks, then it is without a doubt the case that you should learn about the differences. PET, which can also be referred to as polyethylene terephthalate, and PP, which is more commonly referred to as polypropylene, are two of the most prevalent types of plastic that are used in the construction of these containers in the modern day. Despite the fact that both types of plastic can be recycled and that they are regularly used in the food industry, there are some significant differences between the two types of plastic. One of those differences is the frequency with which they are used in the food industry. If you are looking for clarity in the sort of plastic that you select, going with PET plastic cups rather than PP plastic cups is the better option for you to go with, so select these instead. As a result of this, many people who run companies that provide food services opt for the see-through nature of PET rather than the opaque quality of PP plastic when it comes to the drink cups their companies produce. Another factor that should be taken into consideration when selecting a plastic for takeout containers and plastic cups is its resistance to heat and cold, as well as the temperatures at which it can be filled. This is because the two plastics are resistant to different temperatures at which they can be filled. The fill temperature for PP containers is somewhat greater than the fill temperature for PET containers. 
The term "fill temperature" refers to the highest possible temperature at which the food or drink contained within the container can be maintained. Up to 71 degrees Celsius is the hottest temperature at which PET containers may be filled, while the hottest temperature at which PP containers can be filled is 80 degrees Celsius. The ability of PET containers to survive cold (from the outside) is superior to that of PP containers, while the ability of PP containers to withstand heat (from the outside) is superior to that of PET containers. Cups made of PET plastic are in a little better position than containers made of PP plastic when it comes to being able to endure the force of an impact. Despite the fact that it has a higher degree of durability and is more resistant to cracking, it is likely that this is not something that is significant to you in relation to your organization. Because PET containers provide a superior barrier against oxygen than PP containers do, there is a greater chance that the taste and aroma of food that has been stored in PET containers will be preserved compared to food that has been stored in PP containers. On the other hand, PP containers offer a superior protection against moisture, as well as alcohol or chemicals. They are also chemical resistant. When it comes to withstanding acids, fats, and oils, containers made of PET and PP are both just as effective as one another. Because both PET and PP plastic containers have so many wonderful properties, it may be difficult for you to choose which type of container to use as takeout containers or plastic cups for your food service business. Because you can find these qualities in both types of containers, it may be difficult for you to decide which type of container to use. When you have a better grasp of the differences between the two separate types of plastic storage containers, you should be able to make a choice that is more informed and appropriate for your situation. 
Pet and PP plastic difference
Here we will review the difference between plastic materials Pet and PP more precisely.
- Pets
PET (polyethylene terephthalate) is a type of plastic. The benefits of PET are its light weight, excellent transparency, impact resistance, and breakage resistance. It can also avoid carbon dioxide gas, keep the soda "gas," and has strong storability, emphasizing the technical trend of heat and pressure resistance. Today, the bottle is the most popular type of drink. Many beverages that require high temperature bacteria filling, such as flavored water, juice, dairy goods, beverages, sports drinks, and so on, are packaged one after the other in PET bottles. PET bottles have replaced glass bottles as the primary packaging material for beverages. Because of their minimal environmental impact and low energy usage, PET bottles are gradually replacing older packaging materials. It has replaced numerous PVC bottles, bags, aluminum cans, iron cans, glass bottles, and other packaging materials because to its heat and pressure resistance, and has become the packaging material with the greatest growth potential. 
2.PP PP stands for polypropylene, which offers the advantages of transparency, strength, heat resistance, and so on, as well as being less expensive than traditional materials.
- At 100°C, PP bottles can be hot filled. Juice and jam products, for example, must be packaged at this temperature, but standard PET bottles cannot be filled above the glass transition temperature of 76°C. Because they can tolerate temperatures above 100°C, BOPP bottles are commonly used to package functional beverages.
- PP has roughly 5 times the moisture resistance of PET, and the price of PP preform production equipment is less than that of PET preform production equipment.
- PP bottles have a slower processing speed and weaker physical qualities than PET bottles, hence they are not commonly used.
- PP absorbs and releases heat more slowly than PET. As a result, PP bottles not only consume more energy than PET bottles, but the molding and cooling cycles are also longer, making PP 25% less efficient than PET.
- The PP bottle stretch blow molding processing temperature is only 5 °C. Downtime and reject rates are much higher as compared to the processing temperature of 15°C for PET bottles.
- Because the oxygen and carbon dioxide permeability of PP bottles is approximately 30 times that of PET bottles, it cannot be widely employed in barrier packaging of carbonated beverages like PET.