Ratio-Pak Piston (Self-Vented) / MDPE / 300ml - 7660884

Product Name

- Nordson Ratio-Pak Piston (Self-Vented) / MDPE / 300ml - 7660884

Brief Description

- This product is a 300ml, self-vented piston made from Medium-Density Polyethylene (MDPE), specifically designed for use within Nordson EFD's Ratio-Pak dual cartridge systems. It plays a critical role in the precise and efficient dispensing of two-component (2K) materials such as adhesives, sealants, foams, and potting compounds by eliminating trapped air during the filling and dispensing process.

Popular Applications & Uses

- Packaging and dispensing of two-part adhesives and sealants.- Dispensing of foams and coatings.- Application of potting compounds.- Used in automated adhesive dispensing systems for product assembly.- Facilitates on-ratio dispensing in multi-ratio cartridge systems.

Industries that Commonly Use It

- General Manufacturing (for product assembly and bonding applications).- Packaging Services or Contractor (for packaging and dispensing two-part materials).- Chemical Industry (for formulating and packaging two-part chemical compounds).- Automotive Service/Repair (for bonding and sealing in vehicle assembly and repair).- Medical Device/ Prosthetics (for precision assembly and bonding of components).- Aerospace/Defense (for high-precision bonding and sealing in critical applications).- Construction/ Building Services (for applying sealants, adhesives, and coatings).- LED/Electronics (for potting, encapsulating, and bonding electronic components).- Metal Fabrication (for bonding and sealing metal components).- Plastic Fabrication (for bonding plastic parts, and as MDPE is a plastic material).

Special and Unique Features

- **Self-Vented Design:** Uniquely designed to eliminate trapped air between the material and the piston, ensuring air-free dispensing without the need for shims or secondary plugging operations.- **MDPE Construction:** Made from Medium-Density Polyethylene, offering good shock and drop resistance, better stress cracking resistance than HDPE, and good chemical resistance.- **Compatibility:** Compatible with most adhesives and sealants.- **Ratio-Pak System Integration:** Designed as a component of the Nordson Ratio-Pak dual cartridge system, which allows for flexible combination of different mix ratios (1:1 up to 25:1) using snap-together cartridges.- **Efficient Operation:** Ensures on-ratio dispensing and offers fast, foolproof operation.

Key Properties

- **Material:** Medium-Density Polyethylene (MDPE).- **Volume:** 300ml.- **Density:** Typically in the range of 0.926–0.940 g/cm³.- **Impact Resistance:** Good shock and drop resistance properties.- **Stress Cracking Resistance:** Better than HDPE.- **Chemical Resistance:** Highly resistant to a large range of chemicals, including acids, bases, and other solvents.- **Flexibility:** More flexible than HDPE, with high ductility.- **Temperature Resistance:** Melting point between 125 °C and 135 °C; temperature resistant from -50 °C to +90 °C.- **Recyclability:** Fully recyclable.

Surface Compatibility

- The MDPE material of the piston itself is generally compatible with a wide range of two-component adhesives, sealants, foams, and potting compounds.- The Ratio-Pak system allows for matching different barrel types (e.g., polypropylene with nylon) for optimal chemical compatibility with the specific resins being dispensed.

Known backups / known substitutes

- **Non-Vented Pistons:** Nordson EFD also offers non-vented pistons, which may require shims or secondary plugging operations to bleed air.- **Multi-Seal with Integral Center Bleed Plug Pistons:** These pistons bleed air during insertion without a shim.- **Solid Multi-Seal Pistons:** These require a shim to allow entrapped air to bleed past the pistons during insertion.- Other 2K piston options from Nordson EFD or alternative manufacturers of dual cartridge dispensing system components.

Comparison Note

- The Nordson Ratio-Pak Self-Vented MDPE Piston distinguishes itself from non-vented or other piston types by its unique design that automatically eliminates trapped air. This feature streamlines the filling process, reduces labor, and ensures consistent, on-ratio dispensing without the need for additional tools or steps like shims or bleed plugs. Its MDPE construction provides a balance of flexibility, toughness, and chemical resistance, making it suitable for demanding industrial applications.