DuPontTM Crastin® is a stiff, tough PBT thermoplastic with superior electrical insulating properties. Crastin® PBT is the resin of choice for cost-effective, high-performing automotive radar systems.

Low dielectric properties for radar transparency.
Material and design solutions for radar absorbency.
Excellent dimensional stability and low warpage.
Excellent balance of mechanical properties.
Resistance to exterior environments, including road salt, automotive fluids, thermal cycling, and hydrolysis resistance.
Improved laser-marking properties.

Back Housing and Connector

Higher thermal conductivity for heat dissipation
EMI shielding (depending on requirements)
Improved toughness
Superior hydrolysis resistance for hot and humid environments
Improved thermal-shock-cycling resistance
Available laser transparent and improved laser marking
Low warpage for higher dimensional control
Standard grade with good mechanical properties

Mounting Brackets Sensor Support

Excellent combination of toughness and stiffness.
Good chemical resistance.
Extensive material data available for anisotropic analysis.
Improved laser marking solutions available.

Radome

Improved radio transparency with low Dk and low Df
Excellent dimensional stability
Improved toughness
Superior hydrolysis resistance for hot and humid environments
Available laser transparent and with improved laser marking
Low warpage for higher dimensional control
Standard grade with good mechanical properties

Industry Needs

DuPontTM Crastin® PBT resins offer clear advantages for vehicle manufacturers. Our materials help high-resolution camera windshield brackets stand up to the harshest environments.

Excellent dimensional stability and low warpage
Outstanding adhesive compatibility to secure component on the windshield for the life of the vehicle
Superior flow for easy processing of design features, such as snap fits and over-molded inserts
Improved laser-marking properties
Resistance to hydrolysis and low fogging.

Applications & Uses

Markets

Electrical & Electronics

Applications

Electrical & Electronics — Parts & Components,

Connectors,

Housings & Enclosures,

Plastics & Elastomers End Uses

Connectors,

Electrical Connectors,

Radar Housing,

Radomes

Plastics & Elastomers Processing Methods

Injection Molding

Properties

Mechanical Properties


	Value	Units	Test Method / Conditions
Tensile Modulus	8500	MPa	ASTM D638
Stress at Break	120	MPa	ISO 527-1/-2
Strain at Break	3.2	%	ISO 527-1/-2
Flexural Strength	180	MPa	ASTM D 790
Charpy Impact Strength (23°C)	70	kJ/m2	ISO 179/1eU
Charpy Notched Impact Strength (23°C)	12	kJ/m2	ISO 179/1eA
Poisson's Ratio	0.34	-	ASTM E132

Physical Properties


	Value	Units	Test Method / Conditions
Melt Volume - Flow Rate	8	cm³/10min	ISO 1133
Melt Mass Flow Rate - MFR (250°C/2.16 kg)	13	g/10min	ISO 1133
Load	2.16	kg	ISO 1133
Viscosity Number	107C	cm³/g	ISO 307, 1157, 1628
Viscosity Number	1	cm³/g	ISO 307, 1157, 1628
Molding Shrinkage - Parallel	0.3	%	ISO 294-4, 2577
Molding Shrinkage - Normal	1.1	%	ISO 294-4, 2577
Melt Viscosity(1000/sec, 250°C)	230	Pa.s	ISO 11443
Temperature	250	°C	ISO 1133
Intrinsic Viscosity	0.872	-	ISO 307, 1157, 1628

Thermal Properties


	Value	Units	Test Method / Conditions
Melting Temperature (10°C/min)	225	°C	ISO 11357-1/-3
Glass Transition Temperature (10°C/min)	65	°C	ISO 11357-1/-2
Temperature of Deflection Under Load(1.8 MPa)	205	°C	ISO 75-1/-2
Coefficient of Linear Thermal Expansion - Parallel	22	E-6/K	ISO 11359-1/-2
Coefficient of Linear Thermal Expansion - Normal	190	E-6/K	ISO 11359-1/-2
Temperature index (Tensile Strength, 20000h)	153	°C	IEC 60216-1
Temperature Index (Tensile Strength, 5000h)	192	°C	IEC 60216-1

Electrical Properties


	Value	Units	Test Method / Conditions
Surface Resistivity	>1E15	ohm	IEC 60093
Electric Strength	34	kV/mm	IEC 60243-1
Comparative Tracking Index - CTI	5251	-	IEC 60112
Volume Resistivity	>1E13	ohm.m	IEC 60093

Flammability


	Value	Units	Test Method / Conditions
Burning Behaviour (Thickness h)	HB	class	IEC 60695-11-10
Oxygen Index	20	%	ISO 4589-1/-2
FMVSS Class	B	-	ISO 3795 (FMVSS 302)
Burning Rate (1 mm, Thickness)	30	mm/min	ISO 3795 (FMVSS 302)
Ul Recognition	Yes	-	UL 94
Thickness Tested	0.75	mm	IEC 60695-11-10

Other Properties


	Value	Units	Test Method / Conditions
Humidity Absorption (2 mm)	0.15	%	Sim. to ISO 62
Water Absorption (2 mm)	0.35	%	Sim. to ISO 62
Density	1500	kg/m³	ISO 1183

Processing Information (Injection Molding)


	Value	Units	Test Method / Conditions
Drying Recommended	Yes	-	-
Drying Temperature	120	°C	-
Drying Time (Dehumidified Dryer)	2.0 - 4.0	h	-
Processing Moisture Content	≤0.04	%	-
Melt Temperature Optimum	250	°C	-
Min. Melt Temperature	240	°C	-
Max. Melt Temperature	260	°C	-
Mold Temperature Optimum	80	°C	-
Min. Mold Temperature	30	°C	-
Max. Mold Temperature	130	°C	-
Hold Pressure Range	≥60	MPa	-
Hold Pressure Time	3	s/mm	-
Back Pressure	As low as possible	-	-
Ejection Temperature	170	°C	-

Solutions for High-resolution Camera Bracket

	Dimensional Stability	Adhesive Compatibility	Hydrolysis Resistance	High Flow	VOC – Fogging	Snap Fit
Crastin® HR5330HFS BK591	+	++++	++++	++++	++++	++

Best: ++++

Solutions for Radar Housing and Connector

	Low-Warpage Dimensional Stability	Hydrolysis Resistant	Laser Weldable (Absorber)	Laser Markable	Spiral Flow	EMI Shielding (77GHz)	Heat Dissipation
Crastin® HR5330HFS BK591	++	++++	++	+++	++++	++	++

Best: ++++

Chemical Resistance

Chemical Type	Chemical Name	Resistance
Acids	Acetic Acid (5% by mass) (23°C)	Probably Resistant
Acids	Chromic Acid solution (40% by mass) (23°C)	Not Recommended
Acids	Citric Acid solution (10% by mass) (23°C)	Probably Resistant
Acids	Hydrochloric Acid (36% by mass) (23°C)	Not Recommended
Acids	Lactic Acid (10% by mass) (23°C)	Probably Resistant
Acids	Nitric Acid (40% by mass) (23°C)	Not Recommended
Acids	Sulfuric Acid (38% by mass) (23°C)	Not Recommended
Acids	Sulfuric Acid (5% by mass) (23°C)	Not Recommended
Alcohols	Ethanol (23°C)	Probably Resistant
Alcohols	Isopropyl alcohol (23°C)	Probably Resistant
Alcohols	Methanol (23°C)	Probably Resistant
Bases	Ammonium Hydroxide solution (10% by mass) (23°C)	Probably Resistant
Bases	Sodium Hydroxide solution (1% by mass) (23°C)	Probably Resistant
Bases	Sodium Hydroxide solution (35% by mass) (23°C)	Not Recommended
Ethers	Diethyl ether (23°C)	Probably Resistant
Hydrocarbons	iso-Octane (23°C)	Probably Resistant
Hydrocarbons	n-Hexane (23°C)	Probably Resistant
Hydrocarbons	Toluene (23°C)	Probably Resistant
Ketones	Acetone (23°C)	Probably Resistant
Mineral oils	Insulating Oil (23°C)	Probably Resistant
Mineral oils	SAE 10W40 multigrade motor oil (130°C)	Not Recommended
Mineral oils	SAE 10W40 multigrade motor oil (23°C)	Probably Resistant
Mineral oils	SAE 80/90 hypoid-gear oil (130°C)	Not Recommended
Other	1% nonylphenoxy-polyethyleneoxy ethanol in water (23°C)	Probably Resistant
Other	50% Oleic acid + 50% Olive Oil (23°C)	Probably Resistant
Other	DOT No. 4 Brake fluid (130°C)	Not Recommended
Other	Ethyl Acetate (23°C)	Probably Resistant
Other	Ethylene Glycol (50% by mass) in water (108°C)	Not Recommended
Other	Hydrogen peroxide (23°C)	Not Recommended
Other	Phenol solution (5% by mass) (23°C)	Probably Resistant
Other	Water (23°C)	Probably Resistant
Other	Water (90°C)	Not Recommended
Salt solutions	Sodium Carbonate solution (2% by mass) (23°C)	Probably Resistant
Salt solutions	Sodium Carbonate solution (20% by mass) (23°C)	Probably Resistant
Salt solutions	Sodium Chloride solution (10% by mass) (23°C)	Probably Resistant
Salt solutions	Sodium Hypochlorite solution (10% by mass) (23°C)	Probably Resistant
Salt solutions	Zinc Chloride solution (50% by mass) (23°C)	Probably Resistant
Standard Fuels	Diesel fuel (pref. ISO 1817 Liquid F) (>90°C)	Not Recommended
Standard Fuels	Diesel fuel (pref. ISO 1817 Liquid F) (23°C)	Probably Resistant
Standard Fuels	Diesel fuel (pref. ISO 1817 Liquid F) (90°C)	Probably Resistant
Standard Fuels	ISO 1817 Liquid 1 - E5 (60°C)	Not Recommended
Standard Fuels	ISO 1817 Liquid 2 - M15E4 (60°C)	Not Recommended
Standard Fuels	ISO 1817 Liquid 3 - M3E7 (60°C)	Not Recommended
Standard Fuels	ISO 1817 Liquid 4 - M15 (60°C)	Not Recommended
Standard Fuels	Standard fuel with alcohol (pref. ISO 1817 Liquid 4) (23°C)	Probably Resistant
Standard Fuels	Standard fuel without alcohol (pref. ISO 1817 Liquid C) (23°C)	Probably Resistant