Polyram Group

Polyram’s Unique Specialty PBT

Polyram’s Unique Specialty PBT


Polyram's Unique Specialty PBT ( Polybutilene Trephtalate) Products.


Polyram has the unique ability to partner with its clients and to develop engineered plastics according to tailored

specifications, strict industry standards and client requests. We are happy to take this opportunity and proud to introduce

you to three unique Polybutylene terephthalate (PBT) products: Hydrolysis Stabilized PBT, Flame Retardant PBT and

PBT for Gas Injection.


Hydrolysis Stabilized PBT

After an intensive development process of almost two years, which was initiated following the request of a prominent

client in the automotive industry, Polyram has created a high-end hydrolysis-stabilized PBT compound.  Its hydrolysis

stability is so good that the decrease in mechanical properties is close to zero.

At the beginning of the development process, Polyram developed an internal process to simulate the hydrolysis

resistance required by the client. High chemical similarity to the desired material is not enough. It is not easy to detect

the differences in properties of each component and the impact it has on the overall hydrolysis resistance of the final

product. Impact enhancers, glass fibers’ sizing, various additives and the raw materials all affect the resistance to

hydrolysis, as do the specific combination of them all and the production process.

The results of this simulation were validated at a later stage by using a special “Environmental Test Chamber” testing


The product can undergo testing and acclimatizing at temperatures ranging from -40 to +150 degrees centigrade.

The challenge in producing a hydrolysis-stabilized PBT is that PBT absorbs moisture. In humid conditions it absorbs

water and changes its properties. In order to achieve the correct resistance to moisture, Polyram had to carefully

consider and test the impact of additives, PBT raw material, viscosity and glass fiber sizing. Polyram managed to

develop a final product that complies with industry standardization (US-CAR) and is also best suited to the client’s

manufacturing conditions and injecting process.

Polyram’s hydrolysis-stabilized PBT is intended for use in connectors, housing and coverings, sensors and many more

parts for the automotive industry. Polyram continues to develop similar, unfilled PBT and flame –retardant hydrolysis-

stabilized products. Today Polyram has the know-how to provide unique hydrolysis-stabilized PBT solutions to any

customer. The acquired knowledge also helped to improve in other areas. For example, in cooperation with the

company's Bondyram department, Polyram

is working on the development of a comparatively highly hydrolysis-stabilized impact enhancer.


New Addition To Polyram Portfolio: PBT-FR

Polyram has a proven ability to develop and produce a wide range of flame retardant PBT materials and to participate in

large projects for leading international clients. Our current flame –retardant PBT products are suitable for the automotive

as well as the electronic industries, meeting the most stringent standards, even with thin-wall products:

UL94 – V0 at thickness of 0.3-3 mm

  Halogen and Halogen-free products are in development and were tested in wall thickness of 0.4 mm, V0 achieved.


   A variety of flame-retardant PBT grades are available, differentiated by fiber content percentage. The products have

   been tested and proven suitable for the automotive industry and for Over-Molding production and coating applications.

   The products are used in diverse applications, among which are:



Plug and Socket Connectors

Cruise control detector housing

Alternator Cover

Compressor engines

You can easily search our website for flame retardant PBT.

Just click this link: http://www.polyram-group.com/search#

for further details, Our sales team will be happy to answer any questions you may have: email to:



PBT For Gas Injection


Polyram has managed to develop PBT that withstands the process of gas injection.

This breakthrough product fills the mold properly, does not burn, is stable and preserves its color during gas injection.

As the product, which is currently used in knobs and handles, is visible in the final application and is not coated, the

shade and color unity are of critical importance.