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Synthetic Eyelash Extensions are made with PBT. What is PBT?

June 05, 2014 2 Comments

Polybutylene Terephthalate (PBT) chemical structure

Synthetic Eyelash Extensions are made with PBT, but what is PBT? 

Polybutylene terephthalate is a synthetic semi-crystalline engineered thermoplastic with similar properties and composition to polyethylene terephthalate (PET). It is part of the polyester group of resins and shares similar characteristics to other thermoplastic polyesters. Additionally, it is a high performance material with high molecular weight and is often characterized as being a strong, stiff, and engineerable plastic. Color variations of PBT range from white to bright colors. In eyelash extensions the most commonly used colors are black and dark brown.

Use of PBT

Besides it's use in synthetic lash extensions, PBT is present in everyday life and is common in electrical, electronic, and automotive components. PBT resin and PBT compound are the two types of products that are used across various applications. PBT compound is comprised of various materials that can include PBT resin, fiberglass filling and additives; whereas the PBT resin only includes the base resin. The material is often used in mineral or glass filled grades.

For use outdoors and in applications where fire is a concern, additives are included to improve its UV and flammability properties. With these modifications it is possible to have a PBT product that can be used in numerous industrial applications.

PBT resin is used to make PBT fiber as well as electronic parts, electrical parts, and auto parts. TV set accessories, motor covers and motor brushes are some examples of the use of PBT compound. When reinforced, it can be used in switches, sockets, bobbins and handles. The unfilled version of PBT is present in some brake cable liners and rods.

When a material with high strength, good dimensional stability, resistance to various chemicals and good insulations is needed, PBT is a preferred choice given its excellent characteristics. The same is true when bearing and wear properties are determining factors in material selection. For these reasons, valves, food processing machinery components, wheels, and gears are also made from PBT. Its application in food processing components is largely due to its low moisture absorption and its resistance to staining. It also does not absorb flavors.

Advantages of PBT

Some of the major advantages of PBT are evident in its resistance to solvents and low shrinkage rate when forming. The material also has good electrical resistance and due to its fast crystallization is easy to mold. It also has excellent heat resistance for up to 150oC and melting point reaching 225oC. The addition of fibers enhances its mechanical and thermal properties.

2 Responses

Paavani Vadher
Paavani Vadher

February 24, 2020

Can synthetic lashes be put in recycling bin? If yes, which type of plastic does it come under PET1, PET2?? Or is it seemed a hard-to-recycle plastic?

Thank you


July 19, 2017

Where can I order lashes to use in my salon?

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