XAREC Syndiotactic Polystyrene

XAREC is the world's first syndiotactic polystyrene (SPS) resin. Idemitsu created this unique SPS product at our central research laboratories by combining a metallocene catalyst with a styrene monomer. The metallocene catalyst gives flexibility to the structure of the crystallized polystyrene SPS, allowing a variety of benzene ring arrangements. In addition, we have applied our advanced alloying and composite technology to greatly expand the commercial potential of XAREC as an engineering plastic.

XAREC is not only a superior engineering plastic, but is also environmentally friendly. This combination makes it the first choice for many of our customers.

XAREC feature outline

Resistance to hydrolysis Compared to polyester- and polyamide-based resins, XAREC offers a superior hydrolysis resistance, comparable to polyphenylene sulfide.
Chemical resistance XAREC is highly resistant to corrosion by various acids and alkalis, and can withstand automobile oils and antifreeze.
Low specific gravity With one of the lowest specific gravities of all engineering plastics on the market, XAREC reduces the weight and cost of parts.
Heat resistance With a long-term heat resistance of 130°C, a heat distortion temperature of 250°C and a melting point of 270°C, XAREC can be used for wave and reflow soldering. XAREC is also moisture resistant, and useful for surface mount chip parts and connectors.
Electrical properties XAREC's electrical properties, including its dissipation factor and dielectric constant, are similar to those of fluororesins. Because it is electrically stable over a wide range of frequencies and temperatures, XAREC is suitable for high-frequency components.
Dimensional stability Because the flow and transversal direction of the molten resin changes little during mold shrinkage, XAREC offers good dimensional performance when compared to other glass-fiber-reinforced crystalline resins.
Processability XAREC can easily be molded on any standard specification injection molding machine. It possesses high flow properties, close to those of liquid crystal plastic, and degradation due to heating is minimal. It is also ground easily, making XAREC easy to recycle.

Specific gravity, thermal properties and flowability

Chemical Resistance at High Temperature

Chemicals name Temperature XAREC PA66 PBT
S131 GF30% GF30%
Acid Blowby water*1) 100°C Excellent Poor Poor
Alkali 10% sodium hydroxide 80°C Good Fair Poor
Salt 10% calcium chloride 80°C Excellent Poor Excellent
Alcohol Methanol 60°C Excellent Fair Good
Organic solvent Ethyl acetate 70°C Fair Excellent Good
Aceton 50°C Fair Fair Good
MEK MEK 70°C Fair Excellent Good
Toluene 80°C Fair Excellent Good
Chemical used in automobile Gasoline 80°C Excellent Excellent Excellent
Light oil(Gas oil) 80°C Excellent Excellent Excellent
Engine oil 150°C Excellent Excellent Good
Diesel oil 150°C Excellent Excellent Good
Transmission oil 150°C Excellent Excellent Fair
Break fluid 80°C Excellent Excellent Excellent
Silicone grease 150°C Excellent Excellent Excellent
50%LLC 120°C Good Poor Poor
Window washer 80°C Excellent Fair Good
Hybrochloric acid / sulfunic acid mixture adjusted to pH=3(HCI / H2S04 / HN03 mixed acid,PH=3 )

Changs in surface appearance and physical properties after 30 days(720 hours) of immersion.
Excellent: No change on surface appearance and mechanical properties
Good: Slight change on surface appearance and mechanical properties
Fair: Medium change on surface appearance and mechanical properties(swelling.peeling etc.)
Poor: Severe change on surface appearance and mechanical properties(erosion,resolution,etc.)

XAREC supports hybrid electric vehicles

Owing to its desirable heat resistance, electrical properties, chemical resistance and low specific gravity, XAREC is well suited for the manufacture of electronic components for various hybrid electric vehicles. XAREC is also a sound environmental choice, and is compatible with lead-free solder processes.

XAREC in home appliances

Because XAREC performs well even when subjected to temperature changes, or exposed to water chemicals and electrical contact, it has become an essential component of many everyday home appliances.

XAREC's dielectric properties, including its low dissipation factor and dielectric constant, are close to those known for fluororesins, making XAREC ideal for use in high-frequency components.

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