The difference between pp, pps, ptfe

What is pp Material?

Polypropylene (PP) is a polymer made from propylene monomer through addition polymerization. Its chemical name is (C3H6)n. This means that the molecular chain of this polymer is made up of repeating units of propylene (C3H6). PP has a waxy white appearance and is transparent. Its melting point is between 164 and 170 degrees C. PP is highly flammable, especially when wet or submerged in water. It is stable against most chemicals when kept at room temperature. However, degradation can occur in high temperatures or with some solvents. PP is resistant to acids and alkalis below 80 degrees, and it can withstand corrosion from a wide range of organic solvents, salt solutions, and alkalis. PP is also easy to process, and can be molded using injection molding, extrusion and blow molding. It’s widely used for fiber products, automotive parts, medical equipment and other fields.

What is pps Material

The full name of PPS is polyphenylenesulfide. Its molecular composition is composed of sulfur atoms and benzene rings arranged alternately to form a linear polymer. PPS is very heat resistant, with a thermal deformation up to 265 degrees. It can be used for long periods in high temperatures. The mechanical properties of PPS are excellent with a high degree of rigidity, wear resistance, and creep resistance. PPS is also a material with excellent electrical properties. This is especially true in environments of high temperature, humidity and high frequency. Its insulation performance remains stable. PPS has a variety of applications, such as electrical and electronics, automotive, aerospace and more. PPS’s unique properties are evident in these fields.


What is ptfe?

PTFE, or polytetrafluoroethylene, is a fluoropolymer composed of carbon and fluorine atoms. The molecular structure of PTFE gives it many properties and benefits. PTFE is extremely chemically stable and almost impervious to chemical attacks. It is therefore widely used in a wide range of harsh chemical environments. PTFE is also resistant to extreme temperatures and maintains its performance even under these conditions. Because of its extremely low coefficient of friction, PTFE is used to lubricate many surfaces. PTFE’s hardness and density can be adjusted to suit the application. It can also be produced in a variety of forms, including fine powders, water-based dispersions and particles. Due to its biocompatibility, PTFE can be used in the medical industry to create artificial blood vessels and heart valves. Due to its nonstick properties, PTFE coatings are also used widely in the kitchen due to their non-stick properties.

ptfe sheet
1 4 ptfe sheets

Five characteristics are presented below to illustrate their differences

1. Physical Properties

Density: PP has a relatively low density, whereas PPS and TFE have a slightly higher density. The density will depend on the manufacturing process, formulation and other factors.

Melting point is higher for PPS and PTFE than PP. PPS and PTFE are therefore more stable at high temperatures.

Hardness: PPS and TFE are generally harder than PP. This makes them more suitable for certain applications that require high-hardness.

Transparency and Color: PP can be transparent or milky. PPS is pale yellow or white. PTFE, on the other hand, is opaque and white. They are all different and have a slightly different appearance.

Second, chemical stability

Acid and Alkali Resistance: PP and PPS are all resistant to acid and acid-alkali corrosion in a limited range. PTFE has a more pronounced corrosion resistance and is virtually immune to chemical attacks.

Solvent resistance: All three materials are good at resisting solvents, but PTFE is the best.

Long-term stability: PP can degrade in certain conditions. PPS and PTFE are more stable.

Thirdly, mechanical properties

Strength and toughness. PPS and PTFE have a higher strength and toughness than PP and are therefore more competitive for applications that require high strength and durability.

Tensile and compressive strengths: These test results on mechanical properties show that PPS and PTFE have higher tensile and compressive strengths than PP. This shows better mechanical properties.

The fourth is thermal performance

Melting point, thermal stability and performance: PPS and PTFE are both known for their high melting points and excellent thermal stabilities, which allow them to perform well in environments with high temperatures.

Coefficient of Thermal Expansion: The coefficients of thermal expansion of PPS, PTFE, and other materials vary depending on their formulations and manufacturing processes. In general, however, PPS and PTFE have a lower coefficient and better thermal stability.

PPS and PTFE both have good high temperature resistance. The three materials have excellent low temperature performance. However, their specific low temperature performance will depend on the material and the application environment.

5. Processing performance

Process and molding difficulty: PP has a relatively good processing performance. It is easy to mold by injection molding, extrusion, and other processes. PPS requires higher temperatures and more pressures and is more difficult to work with. Processing PTFE requires special equipment and technology.

Mold design and processing temperature range: PP molds are relatively simple, but the range of temperatures they can be processed at is wide. PPS temperature of processing is high. The heat resistance of molds should be considered. The processing temperature for PTFE is much higher and there are stricter requirements on mold materials and design.

Comparing the advantages of pps, ptfe and pps

pp Advantages:

PP is a material that can be molded using a variety processes, including injection molding, blow molding and extrusion. The manufacturing process is relatively easy and efficient.

Low cost: Because the raw material costs of PP are relatively low, it is possible to maintain a low price in mass production. This is beneficial for the competitiveness of the products on the market.

Good toughness: PP materials have good toughness, and they can recover from external forces with good deformation.

Good chemical resistance. It is resistant to a wide range of acids and bases.

PP is a good electrical insulator and can be used to manufacture electrical and electronic devices.

pps Benefits:

PPS is resistant to high temperatures. It can operate at temperatures up to 260 degrees C in a short period of time. This makes it ideal for high temperature environments.

PPS materials are known for their excellent mechanical properties. They have high mechanical strength and hardness.

PPS is chemically stable and resistant to many chemicals, including organic solvents. It can perform well in different chemical environments.

PPS is flame retardant by nature and does not need to be treated with flame retardants. This is a great advantage in certain applications (such electronic and electrical equipment).

Ptfe has many advantages:

PTFE has a high chemical stability and is resistant to most chemical attacks. It can perform well in harsh chemical environments.

Low coefficient of traction: PTFE is the only material with a coefficient of friction that is lower than any other solid engineering data. This makes it a great choice for applications that need low friction, such as bearings and seals. ).

Non-sticking and self-lubricating PTFE is a non-sticking and self-lubricating material that can reduce friction, wear and extend the life of equipment.

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