Product Name
- Nordson Ratio-Pak Piston (Non-Vented) / MDPE / 150ml - 7660609
Brief Description
- This product is a non-vented piston, made from Medium Density Polyethylene (MDPE), designed for use with 150ml Nordson Ratio-Pak dual cartridge systems. It serves as a crucial component for the precise and consistent dispensing of two-part industrial materials such as adhesives, sealants, foams, coatings, and potting compounds. The non-vented design is particularly suited for applications requiring high-precision flow control.
Popular Applications & Uses
- Dispensing two-component adhesives and sealants in assembly operations.- Packaging and dispensing of potting compounds for electronics.- Application of specialized coatings and foams.- Precision fluid dispensing in manufacturing processes to ensure consistent bead size and material application.- Preventing air entrapment and tunneling in high-viscosity materials during dispensing.- Reducing material waste and ensuring a clean wipe of the cartridge walls.
Industries that Commonly Use It
- General Manufacturing (for assembly, bonding, sealing applications)- Chemical Industry (for packaging and dispensing chemical formulations)- Packaging Services or Contractor (for filling and assembling 2K cartridge systems)- Automotive Service/Repair (for structural bonding, sealing, and gasketing)- Construction/ Building Services (for sealants, adhesives, and repair compounds)- Medical Device/ Prosthetics (for precision assembly and bonding of components)- Aerospace/Defense (for high-performance bonding and sealing in critical applications)- LED/Electronics (for potting, encapsulating, and bonding electronic components)- Metal Fabrication (for bonding and sealing metal parts)- Plastic Fabrication (for bonding and sealing plastic components)- Distributers & Resellers (who supply dispensing components and systems)- Engineering Services (for designing dispensing solutions and systems)
Special and Unique Features
- **Non-Vented Design:** Optimized for high-precision adhesive systems requiring consistent pressure and flow, minimizing air bypass during dispensing.- **MDPE Construction:** Offers a balance of flexibility, toughness, and chemical resistance.- **Integral Component of Ratio-Pak System:** Designed to seamlessly integrate with Nordson Ratio-Pak snap-together cartridges, allowing for flexible mix ratios and volumes.- **Consistent Dispensing:** Helps apply even pressure across the fluid surface, ensuring uniform material output.- **Waste Reduction:** Wipes the inner walls of the syringe barrel clean, minimizing material residue and waste.
Key Properties
- **Material:** Medium Density Polyethylene (MDPE).- **Density:** Typically ranges from 0.926–0.940 g/cm³.- **Impact Resistance:** Good shock and drop resistance.- **Stress Cracking Resistance:** Better than High-Density Polyethylene (HDPE).- **Chemical Resistance:** Superior chemical resistance, making it suitable for various adhesives and sealants.- **Flexibility:** More flexible than HDPE, yet stiffer than LDPE.- **Temperature Resistance:** Generally resistant from -50°C to +90°C.- **Food Contact:** Meets food handling guidelines.
Surface Compatibility
- As a piston, its primary compatibility is with the inner surface of Nordson Ratio-Pak cartridges, which are typically made of Polypropylene (PP), Polyethylene (PE), or Nylon, depending on the specific cartridge part.- The MDPE material of the piston itself offers broad chemical compatibility with a wide range of two-part adhesives, sealants, potting compounds, and coatings.
Known backups / known substitutes
- **Self-Vented Pistons:** Nordson offers self-vented MDPE pistons (e.g., part #7660878 for 150ml) which automatically bleed air during insertion, eliminating the need for shims or vent strips.- **HDPE Non-Vented Pistons:** Other non-vented pistons made from High-Density Polyethylene (HDPE) may be available for specific chemical compatibility or rigidity requirements (e.g., part #7660610 for 150ml).- **Other Dispensing Piston Types:** For general syringe barrel dispensing, various plastic (e.g., polyethylene, polypropylene) or rubber pistons exist, including easy-flow, tight-fit wiper, and loose-fit straight wall pistons, each suited for different fluid viscosities and dispensing needs.- **Alternative 2K Cartridge Systems:** Other manufacturers offer dual cartridge systems with their own proprietary piston designs, such as Side-by-Side or Coaxial cartridge systems.
Comparison Note
- The Nordson Ratio-Pak Non-Vented MDPE Piston (7660609) is specifically designed for the Nordson Ratio-Pak configurable cartridge system, offering a balance of material compatibility and precise, air-free dispensing for a wide range of two-part industrial materials. While self-vented pistons offer easier air bleeding during assembly, the non-vented piston, when used with proper techniques (e.g., shims or vent strips), provides excellent control for applications demanding consistent pressure and flow. Its MDPE construction provides a good balance of mechanical properties and chemical resistance compared to other polyethylene variants.
