Modified Xyron PPE/PS and PPE/PA, Properties and charateristic

Xyron modified from PPE, Xyron™ resins are engineering resins, composed of polyphenylene ether (PPE) modified by polystyrene (PS), polyamide (PA), or other polymeric materials.

PS-modified Xyron™ has an amorphouse molecular structure that provides excellent heat resistance, dimensional stability, and mechanical properties. It also exhibits outstanding superiority in flame retardancy (free from halogens), electrical properties, hot-water resistance, and reworkability.

PA-modified Xyron™ grades provide special heat resistance and oil resistance, in addition to the properties of PS-modified Xyron™ grades.

Health and Safety
Combustibility
Xyron is combustible and must be kept strictly away from heat, sparks, and flame during handing and storage. Xyron may emit toxic gases during combustion. Extinguish with water, or with foam or powder chemical extinguisher.

Disposal
Dispose of Xyron by landfill burial or by incineration in a properly equipped facility, in accordance with relevant laws and regulations. Xyron may emit carbon monoxide and other toxic gasses during incineration.

Storing
Keep Xyron strictly away from direct sunlight, water, high humidity, and moisture.

Key Use

• Body panels
• Mirror shells
• Fuel door covers
• Hinge covers
• Relay blocks
• Door handles
• Fuse carriers
• Fuse box covers
• Interior electrical outlets
• Interior plugs/switches
• Interior high precesion parts
• casing for printer, mechanical device on printer
• casing for tray, casing for DVD, CD
• Do not use Xyron for food packaging applications.
• Do not use Xyron for medical devices designed or intended for intracorporeal implantation or contact, whether direct or indirect, with bodily fluids.

Mechanical , Electrical Properties
click on  link for detail properties, 
Non Reinforced ISO Properties
Non Reinforced ASTM Properties

Reinforced ISO Properties
Reinforced ASTM Properties

Resin GroupXyron PS/PPE	Key Attributes Wide range of heat resistance Low specific gravity Low water absorption	Typical Applications Pool & spa parts Impellers Valve Bodies
Xyron PA/PPE	High resistance to hot water Superiority in flame retardant (non-halogen) Excellent Dimensional stability	Electrical boxes Fuse box parts Body panels
Xyron PP/PPE	High resistance to acids and alkalis Excellent electrical properties	Mirror shells Fuel Door covers
Xyron PPS/PPE		Junction box Battery Cases Tractor hoods Motorcycle fairings Relay blocks

Molding

Pre-drying
Modified PPE has the lowest moisture absorption of any engineering plastic and displays excellent hydrolysis resistance. To help ensure against surface appearance faults such as silver streaks, it is nonetheless good practice to pre-dry the material. For applications where surface appearance is critical, always be sure to pre-dry the material. When using a PPE/PA grade, pre-drying is especially important due to the high moisture absorption properties of PA.

Pre-drying should be done at the proper temperature range specified for each grade. A closed loop dehumidifying/drying hopper system is the most efficient equipment for pre-drying Xyron. When using hot-air circulating ovens, Xyron pellets will be efficiently pre-dried when spread out in trays at a uniform depth of 20 to 30 mm.

Take care to ensure that Xyron is not pre-dried for longer than 8 hours. Excessive pre-drying may result in degradation of physical properties and color changes.

Regrind
Properly molded Xyron (sprues, runners, molded articles, etc.) may be reground, dried, and remolded without adverse effects. It is essential that material to be reground be free from oil, grease, dirt, and foreign substances, and shows no signs of degradation. Regrind levels up to 20% can be used successfully, but it is not advisable to use reground material for applications where surface appearances are critical.

Purging
High viscosity GPPS and Asaclean SA™ (available from Asahi Kasei Chemicals Corporation and distributors) are recommended purging materials for all Xyron grades. Purging should be performed at temperature ranges appropriate for each grade.

Downtime
In order to prevent polymer degradation when molding operation is stopped or interrupted, the following measures are recommended.

Up to 30 minutes:

• Maintain cylinder temperature. Purge barrel using same material prior to the re-start of molding operation.

From 30 minutes to 12 hours:

• Decrease cylinder temperature to 200–220°C. Purge barrel using high viscosity GPPS. Upon commencement of molding operation, Purge barrel using material for molding after increasing cylinder temperature to the required level.

For downtime longer than 12 hours:

• Purge barrel with high viscosity GPPS, and shut down machine.

Mold release
Generally, mold release agents are not required for molding Xyron resins. In cases where mold release agents are needed due to the complex shape of the mold, minimal use is recommended. Silicone-based mold release agents such as Pelicoat B™ (manufactured and sold by Chyuko-Kasei, Co., Ltd., Japan) are recommended, as the chemical ingredients do not react with Xyron.