Product Name
Ratio-Pak Piston (Self-Vented) / MDPE / 750ml - 7660887
Brief Description
This is a precision-molded, self-vented piston made from Medium-Density Polyethylene (MDPE), specifically designed for use within Nordson EFD's 750ml Ratio-Pak dual cartridge dispensing systems. It plays a critical role in ensuring accurate, consistent, and waste-free dispensing of two-part industrial materials such as adhesives, sealants, foams, and coatings.
Popular Applications & Uses
- Dispensing two-part adhesives and sealants- Applying foams and coatings- Potting compounds for electronics and other assemblies- Precision application of various high-performance assembly fluids- Ensuring consistent material flow in multi-ratio cartridge systems
Industries that Commonly Use It
- Aerospace/Defense- Automotive Service/Repair- Chemical Industry- Construction/ Building Services- Electrical Services or Products- General Manufacturing- LED/Electronics- Medical Device/ Prosthetics- Mold Making/ Casting- Packaging Services or Contractor- Plastic Fabrication- Transportation/ Specialty Vehicle
Special and Unique Features
- **Self-Vented Design:** Features unique channels or a design that dissipates trapped air, reducing or eliminating the need for centrifuging and preventing air bubbles in dispensed material.- **Optimized for Ratio-Pak Systems:** Designed to fit perfectly within Nordson EFD's Ratio-Pak dual cartridge systems, ensuring seamless operation and compatibility.- **Prevents Tunneling and Suck-Back:** Applies uniform force to viscous fluids, preventing air from tunneling through thick pastes, and helps prevent suck-back of low-viscosity fluids.- **Minimizes Waste:** Precision wiping edges clean the syringe interior as fluid is dispensed, maximizing material usage and reducing residue.- **Consistent Dispensing:** Ensures accurate and repeatable fluid deposits, crucial for quality control in manufacturing processes.- **MDPE Construction:** Made from Medium-Density Polyethylene, offering good chemical resistance and durability.
Key Properties
- **Material:** Medium-Density Polyethylene (MDPE)- **Volume Capacity:** Designed for 750ml cartridges- **Type:** Self-Vented Piston- **Compatibility:** Part of Nordson EFD Ratio-Pak system- **Function:** Ensures consistent pressure, prevents air entrapment, and minimizes material waste during dispensing.
Surface Compatibility
The piston itself does not directly contact an external "surface" in the application sense, but rather the internal surface of the cartridge and the dispensed fluid.- **Internal Cartridge Surface:** Designed for optimal fit and wiping action within Nordson EFD Ratio-Pak cartridges, which can be made of materials like polypropylene (PP) or nylon for chemical compatibility.- **Fluid Compatibility:** MDPE generally offers good chemical resistance to aqueous solutions of salts, acids, and alkalis, and many solvents up to 60°C. It has variable resistance to certain plasticizers and aromatic hydrocarbons. Specific fluid compatibility should be verified with a chemical resistance chart for MDPE.
Known backups / known substitutes
- **Non-Vented Pistons:** Nordson EFD also offers non-vented pistons for Ratio-Pak systems (e.g., 7660683). These might be used for materials where venting is not critical or for specific dispensing methods.- **Other Nordson EFD Piston Types:** Nordson EFD offers various piston types (e.g., SmoothFlow, LV Barrier, Flex) for different fluid viscosities and applications within their Optimum syringe barrel systems. While not direct Ratio-Pak substitutes, they serve similar functions in other dispensing setups.- **Alternative 2K Dispensing System Components:** Other manufacturers produce pistons and cartridges for two-component dispensing systems, though direct compatibility with Nordson Ratio-Pak is unlikely without specific adapters. Examples include Side-by-Side cartridges and DIY dual syringes from Nordson EFD for different applications.
Comparison Note
The self-vented Ratio-Pak Piston distinguishes itself from non-vented alternatives by actively managing air entrapment, which is crucial for applications requiring bubble-free dispensing and consistent material flow, especially with sensitive or air-entrapped fluids. Its MDPE construction provides a balance of chemical resistance and cost-effectiveness compared to other plastic or elastomer piston materials. The 750ml capacity caters to larger volume industrial applications, offering efficiency over smaller cartridge systems. Its integration into the Nordson Ratio-Pak system ensures compatibility with a comprehensive range of mixers and dispense guns, providing a reliable and integrated solution for two-part material dispensing.
