Product Name
Ratio-Pak Piston (Non-Vented) / MDPE / 75ml - 7660545
Brief Description
This product is a non-vented piston, precisely molded from Medium-Density Polyethylene (MDPE), specifically engineered for use with Nordson EFD's 75ml Ratio-Pak dual cartridge systems. It is a critical component in two-component (2K) material dispensing, ensuring uniform pressure application, preventing air entrapment, and facilitating accurate and consistent material flow from the cartridge.
Popular Applications & Uses
- Dispensing a wide variety of two-part adhesives, sealants, and epoxies.- Potting and encapsulation of sensitive electronic components.- Application of specialized coatings and foams.- Precision fluid packaging and dispensing processes in manufacturing and assembly.
Industries that Commonly Use It
- Aerospace/Defense- Automotive Service/Repair- Chemical Industry- Construction/Building Services- General Manufacturing- LED/Electronics- Medical Device/Prosthetics- Mold Making/Casting- Packaging Services or Contractor- Plastic Fabrication- Transportation/Specialty Vehicle
Special and Unique Features
- **Non-Vented Design:** Specifically designed for materials that do not off-gas, providing an airtight and leak-proof seal to prevent air entrapment and ensure dispense accuracy.- **MDPE Material:** Constructed from Medium-Density Polyethylene, offering good chemical compatibility with a broad range of two-component materials and ensuring durability.- **Ratio-Pak System Component:** Integrates seamlessly with Nordson EFD's patented Ratio-Pak dual cartridge systems, which allow for flexible mix ratios (from 1:1 up to 25:1) and various volumes.- **Precision Molded Fit:** Engineered for a cohesive and perfect fit within Nordson EFD cartridges, ensuring smooth piston travel and consistent dispensing results.- **Dual Wiper Edges:** Features dual wiper edges that effectively clean the cartridge walls as material is dispensed, minimizing fluid waste and residue.
Key Properties
- **Material:** Medium-Density Polyethylene (MDPE).- **Volume Compatibility:** Designed for 75ml cartridge capacities.- **Functionality:** Ensures uniform force on the fluid column, preventing tunneling in thick fluids and suck-back in low-viscosity fluids.- **Sealing:** Provides an airtight and leak-proof seal, crucial for maintaining product integrity and preventing leaks.- **Reliability:** Offers consistent and predictable results in fluid packaging and dispensing processes.
Surface Compatibility
- **Cartridge Compatibility:** Primarily designed for use with polypropylene (PP) and nylon cartridge barrels found in Nordson EFD Ratio-Pak systems.- **Material Compatibility:** Compatible with a wide array of two-component (2K) assembly fluids, including various epoxies, silicones, polyurethanes, general adhesives, sealants, coatings, and potting compounds.
Known backups / known substitutes
- **Nordson EFD Self-Venting Pistons:** For materials that may off-gas or require air bleeding during insertion, Nordson EFD offers self-venting pistons, such as AF (Air Free) pistons or Multi-Seal with Integral Center Bleed Plug pistons.- **Alternative Piston Materials:** Depending on specific chemical compatibility requirements or dispensing characteristics, pistons made from other specialized polymers or with O-rings might be considered.- **Third-Party 2K Dispensing Pistons:** Pistons from other manufacturers of two-component dispensing systems could serve as substitutes, though direct compatibility with Nordson Ratio-Pak cartridges and dispensing equipment would need to be verified.
Comparison Note
This non-vented MDPE piston is specifically engineered for applications where the dispensed material does not off-gas, providing a complete and airtight seal within the cartridge. This design ensures maximum material utilization and prevents air from being introduced into the fluid during dispensing.In contrast, self-venting pistons are designed with features to automatically bleed trapped air during piston insertion, which is advantageous for materials prone to off-gassing or in processes where manual air bleeding is impractical. The MDPE construction of this piston offers a balance of chemical resistance and cost-effectiveness for a broad range of common 2K materials, differentiating it from pistons made of more specialized or chemically resistant polymers.
