Ratio-Pak Piston (Non-Vented) / MDPE / 100ml - 7660589

Product Name

- Nordson Ratio-Pak Piston (Non-Vented) / MDPE / 100ml - 7660589

Brief Description

- This product is a non-vented piston made from Medium-Density Polyethylene (MDPE), specifically designed for use with Nordson Ratio-Pak® 100ml dual cartridge systems. It is an individual component that helps to dispense two-part (2K) materials such as adhesives, sealants, foams, coatings, and potting compounds by ensuring even pressure distribution and wiping the cartridge walls clean to prevent waste.

Popular Applications & Uses

- Dispensing two-part adhesives and sealants.- Packaging and applying foams and coatings.- Dispensing potting compounds for electronic components.- General assembly applications requiring precise metering of two-component materials.

Industries that Commonly Use It

- General Manufacturing (for assembly fluids, adhesives, sealants)- Automotive Service/Repair (adhesives, sealants for assembly and repair)- Construction/Building Services (coatings, sealants, foams)- LED/Electronics (potting compounds, coatings, sealants)- Medical Device/Prosthetics (precision assembly and bonding)- Aerospace/Defense (high-performance adhesives and sealants)- Chemical Industry (packaging and dispensing various two-part materials)- Packaging Services or Contractor (packaging two-part materials)- Plastic Fabrication (as a component in plastic dispensing systems)- Industrial Supply (distributors and suppliers of dispensing components)

Special and Unique Features

- Designed for Nordson Ratio-Pak® configurable multi-ratio cartridge systems, allowing flexible combination of different mix ratios (1:1 up to 25:1).- Made from MDPE, offering a balance of strength, flexibility, and chemical resistance.- Non-vented design, suitable for specific material types or when external venting methods (like vent strips) are preferred during piston insertion.- Ensures even pressure distribution across the fluid surface for consistent dispensing.- Wipes the inner walls of the syringe barrel clean, reducing material waste and mess.

Key Properties

- Material: Medium-Density Polyethylene (MDPE).- Density: 0.926–0.940 g/cm³.- Good shock and drop resistance.- Higher stress cracking resistance compared to HDPE.- Less notch sensitive than HDPE.- More flexible and ductile than HDPE.- Good resistance to acid and base attack, oxidants, and reducing agents.- Low water absorption capability.- Low friction properties.- Maximum operating temperature: Approximately 50°C.

Surface Compatibility

- Compatible with a wide range of two-part materials including various adhesives (epoxies, acrylics, urethanes), sealants, foams, coatings, and potting compounds.- MDPE material offers good chemical compatibility with most adhesives and fluids.

Known backups / known substitutes

- Nordson Ratio-Pak Self-Vented Pistons (e.g., 7660873 for 75ml, 7660878 for 150ml) for easier air bleeding during insertion.- Nordson Ratio-Pak Non-Vented Piston / HDPE / 100ml (Part #7661372) for different material properties.- Pistons for other Nordson EFD 2K cartridge systems (e.g., Film-Pak®, Side x Side, coaxial systems).- Generic syringe barrel pistons for adhesive dispensing, though specific compatibility with Ratio-Pak cartridges may vary.

Comparison Note

- This non-vented piston requires a separate method, such as a vent strip (e.g., 7660945) or a shim, to allow entrapped air to escape during insertion into the cartridge. In contrast, self-venting pistons are designed with an integral mechanism to automatically bleed air, offering a more streamlined filling process.- The MDPE material provides a balanced profile of flexibility, impact resistance, and chemical resistance, positioning it between the more rigid and strong HDPE and the more flexible LDPE.