Product Name
Nordson Ratio-Pak Piston (Non-Vented) /MDPE / 750ml - 7660683
Brief Description
This product is a non-vented piston, also referred to as a rear seal, specifically designed for Nordson EFD 750ml Ratio-Pak dual cartridge systems. Made from Medium Density Polyethylene (MDPE), it plays a crucial role in the controlled dispensing of two-part materials such as adhesives, sealants, coatings, and potting compounds. The non-vented design is typically suited for thicker, stringy fluids or applications where air trapping is managed by other means, such as a reusable vent strip.
Popular Applications & Uses
- Dispensing two-part adhesives for bonding and assembly- Applying sealants in construction and manufacturing- Potting electronic components with two-component compounds- Packaging and dispensing foams and coatings- Use in manual or mechanical dispensing guns compatible with Ratio-Pak systems
Industries that Commonly Use It
- Chemical Industry (for packaging and dispensing 2K materials)- General Manufacturing (for assembly, bonding, and sealing applications)- Construction/Building Services (for sealants and adhesives)- Automotive Service/Repair (for bonding, sealing, and repairs)- Aerospace/Defense (for high-performance bonding, sealing, and potting)- Medical Device/Prosthetics (for assembly, bonding, and potting of devices)- LED/Electronics (for potting, bonding, and sealing electronic components)- Packaging Services or Contractor (for filling and assembling cartridges)- Marine (for sealing and bonding in marine applications)- Furniture and Cabinet & Woodworking (for various bonding applications)- Metal Fabrication and Plastic Fabrication (for bonding and sealing components)
Special and Unique Features
- **Non-Vented Design:** Ideal for specific fluid viscosities, particularly thicker, stringy materials, or when external venting solutions are employed.- **MDPE Material:** Provides a balance of strength, flexibility, and chemical resistance.- **Part of Ratio-Pak System:** Integrates with Nordson EFD's unique snap-together cartridge design, allowing for flexible mix ratios (1:1 up to 25:1) and volumes.- **Precision Fit:** Designed to create an optimal interference fit within the syringe barrel, ensuring clean wiping of walls and minimizing fluid waste during dispensing.- **Durability:** MDPE offers good shock and drop resistance, enhancing the integrity of the cartridge system.
Key Properties
- **Material:** Medium Density Polyethylene (MDPE)- **Density:** 0.926–0.940 g/cm³- **Volume:** Designed for 750ml cartridges- **Flexibility:** More flexible than HDPE, allowing for twisting and shaping without easy breakage.- **Toughness:** Offers a good balance between stiffness and toughness.- **Impact Resistance:** Excellent resistance to impact and shock.- **Stress Cracking Resistance:** Higher resistance to stress cracking compared to HDPE.- **Chemical Resistance:** Strong resistance to acid and base attack, including oxidants and reducing agents.- **Low Friction:** Suitable for applications requiring sliding or low resistance surfaces.
Surface Compatibility
- Primarily designed for use with Nordson EFD Ratio-Pak cartridges, which are commonly made of Polypropylene (PP) or Nylon.
Known backups / known substitutes
- **Self-Vented Pistons:** Nordson EFD offers self-vented pistons (e.g., part #7660887 for 750ml) for Ratio-Pak systems, which are suitable for fluids where air venting is critical during filling or dispensing.- **Other Piston Types:** Nordson EFD provides various piston types (e.g., SmoothFlow, LV Barrier, Flatwall) tailored for different fluid viscosities and dispensing requirements within their broader syringe barrel systems.- **Alternative Dispensing Systems:** Other manufacturers offer two-component cartridge systems and pistons, though direct compatibility with Nordson Ratio-Pak cartridges is unlikely due to proprietary designs.
Comparison Note
The Nordson Ratio-Pak Piston (Non-Vented) /MDPE / 750ml stands out due to its integration within the highly configurable Nordson Ratio-Pak system, which allows for flexible mix ratios and volumes by snapping together individual cartridges. While vented pistons are available for easier filling and dispensing of certain materials, this non-vented version is specifically engineered for applications involving thicker fluids or where a separate venting mechanism is preferred. Its MDPE construction provides a robust balance of mechanical and chemical properties, offering better stress cracking and impact resistance than HDPE, making it a durable choice for demanding industrial applications.
