Polybutylene Terephthalate PBT 1184G-A15 Overview

Today, with the continuous advancement of material innovation, PBT (Polybutylene Terephthalate) is transforming from a traditional engineering plastic to a multifunctional composite material. Toray's PBT 1184G-A15, as a high-performance plastic with three characteristics of impact modification, glass fiber reinforcement and halogen flame retardancy, is opening up a brand-new design space in the fields of electronic components and industrial electrical equipment.

PBT 1184G-A15

01｜Upgrade of PBT polybutylene terephthalate: Multi-dimensional synergy of performance

PBT materials are favoured by engineering designers for their dimensional stability, electrical insulation and heat resistance. Toray's PBT 1184G-A15 is reinforced with 15% glass fibres, combined with a highly effective halogenated flame retardant and an impact modification system to give it outstanding performance in the following areas:

High toughness and strength at the same time:

notched impact strength of 5.5 kJ/m², while the flexural modulus is up to 6500 MPa, taking into account the requirements of structural load bearing and impact resistance.

Stable and flame-retardant, suitable for the demands of precision electronics

Under three wall thicknesses of 0.75mm, 1.5mm and 3.0mm, PBT 1184G-A15 has all passed the UL94 V-0 flame retardant grade test and is suitable for electronic structural components with strict requirements for fire resistance performance.

It has excellent thermal stability and can withstand high-temperature environments

The heat distortion temperature of the material is as high as 220°C (under 0.45MPa conditions), and the long-term electrical service temperature reaches 130° C. It can maintain the stability of structure and performance in continuously high-temperature or heat-generating parts.

Low water absorption rate ensures insulation performance

With a water absorption rate of only 0.07%, it can maintain dimensional accuracy and insulation capacity even in a high-humidity environment, reducing the risk of electrical failure caused by moisture absorption expansion.

02 | From Materials to Applications: The ideal choice for electronic structural component design

Under the trend of miniaturization and high reliability of electronic devices, PBT 1184G-A15 has become the preferred material for components such as connector housings, power module housings, and relay seats.

Multi-cavity injection molding has excellent compatibility: the flow length can reach 140mm, supporting the efficient molding of complex thin-walled parts.

Smooth surface, convenient for post-processing: High-precision appearance, suitable for surface spraying, printing, and laser marking.

Good dimensional stability: Small molding shrinkage rate (0.5% in the flow direction), ensuring consistency in component installation.

03｜Overview of Core Performance Data: Technical Basis of PBT 1184G-A15

UL	Condition	Standard	Value	Unit
CTI		IEC 60112	2	PLC
HAI	All Color 0.75mm	UL 746A	3	PLC
HAI	All Color 1.5mm	UL 746A	3	PLC
HAI	All Color 3.0mm	UL 746A	3	PLC
HVTR		UL 746A	1	PLC
HWI	All Color 0.75mm	UL 746A	4	PLC
HWI	All Color 1.5mm	UL 746A	3	PLC
HWI	All Color 3.0mm	UL 746A	3	PLC
RTI	Elec All Color 0.75mm	UL 746B	130	°C
RTI	Elec All Color 1.5mm	UL 746B	130	°C
RTI	Elec All Color 3.0mm	UL 746B	130	°C
RTI	Imp All Color 0.75mm	UL 746B	110	°C
RTI	Imp All Color 1.5mm	UL 746B	110	°C
RTI	Imp All Color 3.0mm	UL 746B	120	°C
RTI	Str All Color 1.5mm	UL 746B	120	°C
RTI	Str All Color 3.0mm	UL 746B	130	°C
Volume Resistivity		ASTM D257	1E15	Ω.cm
Dimensional Stability		UL746	0.0	%
Dielectric Strength		ASTM D149	23	KV/mm
Arc Resistance		ASTM D495	7	PLC
Flame Rating	All Color 0.75mm	UL94	V-0
Flame Rating	All Color 1.5mm	UL94	V-0
Flame Rating	All Color 3.0mm	UL94	V-0
Mechanical behavior	Condition	Standard	Value	Unit
Elongation	Break 23°C	ISO 527	2.5	%
Flexural Strength	23°C	ISO 178	170	MPa
Flexural Modulus	23°C	ISO 178	6500	MPa
Tensile Strength	23°C	ISO 527	110	MPa
Tensile Modulus	23°C	ISO 527	6900	MPa
Friction Coefficient	VS Metal		0.2
Friction Coefficient	VS Metal Unlubricated	INTERNAL METHOD	0.15
Charpy Un-notch Impact	23°C	ISO 179	35	kJ/m²
Charpy Notch Impact	23°C	ISO 179	5.5	kJ/m²
Thermal	Condition	Standard	Value	Unit
HDT	0.45MPa	ISO 75	220	°C
HDT	1.8MPa	ISO 75	205	°C
CLE	-30.0~100°C	ISO 11359	5.3E-5	cm/cm/°C
Physical property	Condition	Standard	Value	Unit
Water Absorption	23°C 24hr	ISO 62	0.07	%
Shrinkage	Flow 80×80×3mm	INTERNAL METHOD	0.5	%
Shrinkage	xFlow 80×80×3mm	INTERNAL METHOD	1.2	%
Density	23°C	ISO 1183	1.55	g/cm³
Spiral Flow	250°C 93MPa 1.0mm	INTERNAL METHOD	140	mm
Electrical properties	Condition	Standard	Value	Unit
CTI		UL 746	2
Dielectric Constant	23°C 1KHz 60RH	IEC 60250	3.8
Dielectric Constant	23°C 50Hz 60RH	IEC 60250	3.6
Volume Resistivity		IEC 60093	5.6E+16	Ω.cm
Dielectric Strength		IEC 60243	14	KV/mm
Arc Resistance		IEC 60950	135	s
Dissipation Factor	23°C 1MHz 60RH	IEC 60250	0.02
Dissipation Factor	23°C 50Hz 60RH	IEC 60250	0.002
Hardness	Condition	Standard	Value	Unit
Rockwell Hardness	M Scale 23°C	ISO 2039	85
Flammability	Condition	Standard	Value	Unit
Flame Rating	All Color 0.75mm	UL94	V-0
Flame Rating	All Color 1.5mm	UL94	V-0
Flame Rating	All Color 3.0mm	UL94	V-0

04 | Performance Comparison: Toray PBT 1184G-A15 vs. Standard Flame-Retardant PBT

Property	Toray PBT 1184G-A15	Standard Unreinforced FR PBT	Performance Advantage
Tensile Strength	110 MPa	50–60 MPa	~90% improvement in strength
Flexural Modulus	6500 MPa	2300–2700 MPa	~2.5× increase in stiffness
Notched Charpy Impact Strength	5.5 kJ/m²	2.0–2.5 kJ/m²	Over 100% increase in toughness
Heat Deflection Temperature (1.8 MPa)	205°C	160–180°C	Thermal stability improved by 20–30°C
Shrinkage (Flow / Transverse)	0.5% / 1.2%	1.2% / 2.5%	Enhanced dimensional stability for precision fitting
UL94 Flame Rating	V-0 @ 0.75–3.0 mm	V-0 @ ≥1.5 mm	Reliable flame retardancy even in thin-wall parts

This comparison clearly highlights the advancements of Toray PBT 1184G-A15 across mechanical strength, thermal resistance, flame retardancy, and dimensional control—making it an ideal material choice for electronics developers requiring high performance in multiple aspects.

05 | Environmental Protection and Functionality in Balance

With the tightening of global environmental protection regulations, Toray's PBT material research and development is gradually evolving towards low VOC and recyclability. The future PBT polybutylene terephthalate materials will further move towards the following trends:

Halogen-free flame retardant system substitution: Enhancing environmental protection standards and expanding to automotive and medical electronic scenarios.

Higher impact grade development: Meeting the extreme requirements of outdoor equipment and industrial instruments for drop and impact.

Intelligent adaptive materials: Achieve compatibility with new-generation assembly processes such as laser welding and infrared recognition.

06 | Conclusion: The PBT 1184G-A15 is the balance point between performance and efficiency

As a representative of high-toughness halogen flame retardants in Toray's PBT series, PBT 1184G-A15 demonstrates the multi-functional potential of PBT materials. It is not only the safety guardian of structural components, but also the booster for the iteration of electronic design. For manufacturing enterprises that require a balance between high reliability and molding efficiency, this material offers not only physical properties but also the possibility of innovative design.

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Toray's PBT 1184G-A15 Overview | Properties and Data Sheet

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