Polyester-based thermoplastic engineering plastic
with excellent electrical properties,
chemical resistance, and long-term heat resistance
TORAYCON™ PBT resin is a PBT resin (polybutylene terephthalate) with excellent electrical properties and chemical resistance. Based on PBT resin, which can easily be provided with various functions by compounding with various additives and is easy to color, we offer a diverse lineup of grades tailored to applications in all colors.
Features
Electrical Properties
It has excellent tracking resistance, dielectric properties, and dielectric breakdown properties, making it suitable for electronic and electrical components, automotive components, etc.
High Dimensional Accuracy
It has one of the lowest water absorption rates among thermoplastic resins. There is almost no need to consider the effect of water absorption on molded products.
Fast Molding Cycle
It has a fast crystallization rate and exhibits excellent mechanical properties even at low mold temperatures during molding. It also has good dimensional stability, and molded products with good appearance can be easily obtained.
Mechanical Properties
It is characterized by lower dependence on molding conditions than other crystalline resins. It also has excellent creep resistance, fatigue resistance, and anti-friction wear resistance.
Heat Resistance
It has a high melting point of 224°C, excellent long-term heat resistance, and can be used continuously at 120°C to 140°C.
Chemical Resistance
It has excellent oil resistance and solvent resistance, and is unaffected by most chemicals (organic solvents, weak acids, weak alkalis, etc.).
Flammability
It is easily made flame retardant and has excellent glow wire properties. It is also possible to develop high-performance PFAS-free grades.
High Performance
The crystalline structure contains a crystalline part and a relatively large amorphous part. Therefore, it is easy to modify with additives and add various functions, making it possible to design grades with many performance features.
Reasons to Choose
- Optimal electrical properties for electronic and electrical components
- High dimensional stability essential for improving product reliability
- Fast molding cycle realizing high productivity
Optimal electrical properties for electronic and electrical components
TORAYCON™ PBT resin, which has stable insulation properties and excellent dielectric properties even in
environmental changes, is suitable as an insulating material. It also has good tracking resistance, making
it easy to maintain electrical insulation and reducing the risk of short circuits and failures. Furthermore,
because of its excellent heat resistance, it maintains its performance even in high-temperature
environments.
These characteristics enable the design of high-performance electronic and electrical devices with high
safety and reliability, significantly improving quality.
Electrical properties of TORAYCON™: Comparison with other resins
| Volume resistivity (Ω・m) |
Dielectric constant (50Hz～1MHz) |
Dielectric loss tangent (50Hz～1MHz) |
Dielectric breakdown strength (MV/m 1/8" thick) |
Arc resistance (s) |
|
|---|---|---|---|---|---|
| TORAYCON™ 1401 X06 | 4×1014 | 3.3 | 0.002～0.02 | 17 | 144 |
| Polyacetal (Copolymer) | 1012 | 3.7 | 0.001～0.0015 | 20～23 (1/16") | Melt |
| Nylon 6 | 7×1012 | 3.4～4.0 | 0.01～0.03 | 23 | 140 |
| Polycarbonate | 2×1014 | 2.96～3.17 | 0.001～0.01 | 16 | 125 |
| Modified PPO | 1015 | 2.64～2.68 | 0.0007～0.0014 | 20～22 | - |
| Diallyl phthalate | 2×1014 | 3.4～3.6 | 0.009～0.011 | 18 | 118 |
| Phenolic resin | 109～1012 | 5～15 | 0.08～0.50 | 12～13 | 20 |
| Unsaturated polyester | 1010～1012 | 3.2～4.3 | 0.006～0.05 | 20 | 125 |
Temperature dependence of volume resistivity
Temperature dependence of dielectric properties of TORAYCON™
Temperature dependence of dielectric constant
Temperature dependence of dielectric loss tangent
High dimensional stability essential for improving product reliability
TORAYCON™ PBT resin is a material with high dimensional stability essential for improving the reliability of
electronic and electrical components. It is one of the materials with the lowest water absorption rate among
thermoplastic resins, and because it can maintain the dimensions of molded products even with changes in
humidity and temperature, it preserves the dimensional accuracy of components and achieves stable operation
over a long period. In addition, because it combines excellent mechanical strength and heat resistance,
highly reliable components can be realized even under severe environments.
These characteristics can significantly improve the quality and reliability of electronic and electrical
components.
Coefficient of linear expansion of TORAYCON™ (Representative examples)
| 1101G-30 | ||
|---|---|---|
| Temperature range [°C] | Coefficient of linear expansion [x10-5 1/℃] | |
| Flow direction MD | Transverse direction TD | |
| -40～23 | 2.6 | 7.7 |
| 23～80 | 1.8 | 13.0 |
| 80～150 | 1.5 | 17.9 |
| 150～200 | 1.7 | 23.6 |
| -40～200 | 1.9 | 15.3 |
*This data represents typical measured values obtained under specific conditions.
Reference: Measurement method of coefficient of linear expansion
Dimensional properties of TORAYCON™ in chemical immersion environments
| Chemicals | Weight change rate (%) | Dimensional change rate (%) | Tensile strength retention rate (%) | Appearance change |
|---|---|---|---|---|
| Pure water | 0.3 | 0 | 99 | No change |
| 3% Sulfuric acid | 0.3 | 0.1 | 97 | 〃 |
| 30% Sulfuric acid | 0.2 | 0 | 99 | 〃 |
| 10% Nitric acid | 0.3 | 0 | 99 | 〃 |
| 35% Hydrochloric acid | 0.5 | 0 | - | Slight loss of gloss |
| 1% Caustic soda | 0.3 | 0.1 | 92 | 〃 |
| 10% Caustic soda | -0.1 | 0.1 | 91 | 〃 |
| 10% Sodium chloride solution | 0.3 | 0 | 95 | No change |
| 40% Chromic anhydride | -0.2 | 0 | 100 | 〃 |
| Methanol | 1.3 | 0.4 | 85 | 〃 |
| Ethanol | 0.3 | 0 | 97 | 〃 |
| Acetone | 3.9 | 1 | 72 | 〃 |
| Methyl ethyl ketone | 2.9 | 0.5 | 77 | 〃 |
| Ethyl acetate | 2.7 | 0.4 | 80 | 〃 |
| Heptane | 0.1 | 0 | 100 | 〃 |
| Cyclohexane | 0 | 0 | 100 | 〃 |
| Glacial acetic acid | 2.2 | 0.2 | 78 | 〃 |
| Benzene | 3 | 0.5 | 70 | 〃 |
| Toluene | 2.1 | 0.3 | 85 | 〃 |
| 5% Phenol | 9.6 | 1.7 | 60 | Yellowing and swelling |
| Carbon tetrachloride | 0.6 | 0 | 100 | No change |
| Ethylene dichloride | 16.8 | 4.7 | 50 | Swelling |
| Dioctyl phthalate | -0.2 | 0 | 100 | No change |
| Dimethylformamide | 2.7 | 0.3 | 80 | 〃 |
| 1% Surfactant | 0.2 | 0.1 | 99 | 〃 |
| Gasoline | 0 | 0.1 | 99 | 〃 |
| Olive oil | 0 | 0 | 100 | 〃 |
| Kerosene | 0 | 0 | 100 | 〃 |
| Heavy oil | 0 | 0 | 100 | 〃 |
| Machine oil | 0.1 | 0.1 | 100 | 〃 |
Fast molding cycle realizing high productivity
The crystallization of PBT resins including TORAYCON™ PBT resin is generally much faster than PET, so even if the mold temperature during injection molding is low, molded products with excellent mechanical properties, good dimensional stability, and beautiful appearance can be easily obtained. Since it is also possible to shorten the cooling time in the mold, more parts can be produced in a short time (fast molding cycle). This significantly improves the efficiency of the manufacturing process, contributing to cost reduction, productivity improvement, and ultimately, enhanced competitiveness.
Crystallization rate and fast molding cycle of PBT resin
Comparison of crystallization rate between PBT resin and other polymers
Source: Created by Toray based on Saturated Polyester Resin Handbook
Gate seal time of PBT resin
Reference: Dimensions and mold layout of molded products for mold releasability evaluation
Dimensions of molded product for mold releasability evaluation (Overall view)
Mold layout of molded product for mold releasability evaluation
For other details on product features and information on molding, please see Technical Information.
View Technical InformationApplications
TORAYCON™ PBT resin is used in various applications such as automotive ECU cases and junction boxes.
ECU Case
TORAYCON™ also has a rich lineup of optimal grades for automotive ECU cases. Combining high heat resistance, excellent mechanical strength, and excellent electrical insulation, TORAYCON™ realizes highly reliable components that exhibit high performance even in severe automotive environments. Especially for ECU cases, we offer a large number of low warpage grades with high dimensional accuracy, enabling optimal solution proposals.
Junction Box
TORAYCON™ also has a lineup of grades featuring low warpage optimal for automotive junction boxes. Due to its high dimensional stability and excellent mechanical strength, it can stably exhibit performance even in severe automotive environments, enabling optimal solution proposals.
Battery Gasket
TORAYCON™ has a lineup featuring optimal flexibility for battery gaskets. In addition to excellent flexibility, the TORAYCON lineup, which combines sealability, heat resistance, and processability, exhibits highly reliable and stable performance even under severe environments. Toray offers a large number of grades with excellent sealability for battery gaskets and proposes optimal solutions.
Toray's Proposals
Introducing technologies, methods, and products
that support advanced manufacturing
Toray's Proposals
Development of optimal PBT and PPS resins for laser weldability to improve quality and shorten manufacturing periods of high-performance device components
Mobility xEV High-performance devices Downsizing Laser weldability
Featured grades
Lineup of high dimensional accuracy materials for telecommunications equipment and sensor components
Featured grades
Development of high impact materials of Toray AMILAN™ Nylon resin and TORAYCON™ PBT resin contributing to vehicle safety and weight reduction
Featured grades
PBT resin for extrusion molding
You can also view solutions that address product development challenges by field.
View Solutions
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Overcoming the weaknesses of PBT resin! Toray's evolved "hydrolysis resistance technology"
PBT resin used for ADAS components deteriorates due to hydrolysis when exposed to high temperature and high humidity environments for a long period, causing a decrease in strength. Toray has invented a new proprietary resin modification technology and succeeded in improving hydrolysis resistance while maintaining the excellent properties of PBT resin (moldability and processability, dimensional accuracy, electrical properties).
No more trouble with heat cycle cracking! PBT resin "heat cycle resistance formulation" and examples of utilizing Toray CAE analysis
We have contributed to solving challenges in metal-resin composite parts by developing PBT resins with improved heat cycle resistance and providing customers with preliminary verification results using our proprietary CAE analysis software. We introduce grades suitable for heat cycles and examples of utilizing CAE analysis.
Toray TORAYCON™ PBT resin: Proposing deepened high-durability automotive solutions! Drastically improving "alkali resistance" through water-repellent technology and hydrolysis resistance technology
Various ADAS products supporting the evolution of automobiles are increasingly used in severe environments due to their component function of peripheral monitoring. We introduce a new highly durable alkali PBT resin that has significantly improved alkali resistance, which is a weakness of PBT resin, compared to conventional products.
Achieving both heat dissipation, EMI shielding, airtightness, and lightweighting Proposal of metal-resin bonding technology contributing to new product manufacturing
By integrally molding metal and resin, it becomes possible to design products that combine the characteristics of metals, such as heat dissipation and EMI shielding, with the characteristics of resins, such as lightweighting and easy processability, but ensuring airtightness is a major challenge. This time, we will introduce an overview of metal-resin bonding technology that solves this challenge, application examples, and expected future applications.
Toray's highly durable TORAYCON™ PBT resin "5008" series compliant with USCAR standard class IV or higher
PBT resin is applied to many automotive electrical components, but in high temperature and high humidity environments, resin deterioration causes a decrease in strength, so improvement in durability is required. Toray has drastically improved conventional hydrolysis resistance technology and developed the "5008" series compliant with T4 (150°C) or higher of the USCAR standard.
Maximizing the features of galvano-scanning laser welding: TORAYCON™ PBT resin 1251G-30 HL contributing to productivity improvement
In recent years, the adoption of galvano-scanning type laser welding, which has high welding quality, has been expanding as a joining method for automotive components. Toray has developed a highly laser-transmitting PBT resin, TORAYCON™ 1251G-30 HL, which is optimal for galvano-scanning laser welding while maintaining the characteristics of PBT resin.
