Metal Seals for Strapping/Banding
12x25mm Semi-Open Metal Seals for Strapping/Banding
These semi-open metal seals are designed to secure strapping/banding around cartons, bundles and palletised loads. Used with compatible strapping and a suitable tensioner/sealer, the seal is crimped to lock the strap in place, helping maintain tension during handling, storage and transit. Semi-open seals are a widely used choice for general-purpose strapping applications where a dependable mechanical joint is required.
Key Features
Semi-open seal design:
The semi-open profile helps guide the strap into position and supports consistent sealing when crimped with the correct tool.
For strapping/banding operations:
Suitable for common packaging workflows such as carton closure, bundling and pallet stabilisation where strapping is used to reinforce loads.
Common industry size:
This listing covers semi-open seals in the 12mm x 25mm format, a frequently referenced size across packaging suppliers for strapping seals.
Bulk supply for busy packing areas:
Often supplied in high-count packs/boxes to support continuous use in warehouses, despatch areas and production lines.
- Size: 12mm x 25mm semi-open metal seal format
- Category: Strapping / Buckles & Seals / Metal Seals
- Use: Strapping/banding seal for securing strapped loads
Typical Uses
- Securing cartons and cases for shipment
- Bundling products such as timber, tubes, profiles or boxed items
- Stabilising pallet loads with strapping
- General warehouse and despatch strapping tasks
12x25mm Semi-Open Metal Seals — Full Product Guide
Choosing the right seal is essential for a reliable strapping joint. The seal must match the strap width and be compatible with the strapping type and the sealing method used (manual sealer, combination tool, etc.). The guidance below explains how semi-open seals are typically used and what to consider when selecting them for your packaging process.
How It Works
In a standard strapping workflow, the strap is tensioned around the load and then secured using a metal seal. The strap ends are positioned through/within the seal and a sealing tool crimps the seal, deforming the metal to grip the strap. This creates a mechanical lock intended to hold tension and resist slippage during handling.
Because sealing performance depends on correct tool setup and technique, always use a compatible sealer and follow your tool/strap manufacturer’s instructions for best results.
Materials and Construction
Semi-open strapping seals are metal seals intended to be crimped. Many suppliers describe this style as a metal seal used for polypropylene strapping applications, and they are commonly sold in bulk quantities for packaging operations.
Strap Type Compatibility
Across multiple supplier listings, 12mm x 25mm semi-open seals are commonly referenced for use with 12mm polypropylene (PP) strapping. Ensure the seal matches your strap width and that your strap type (PP, PET, steel, etc.) is suitable for the seal style and duty level required for your load.
Tooling and Setup
- Sealer/combination tool: Use a tool designed for semi-open seals and the strap width you are running.
- Correct crimp: A proper crimp pattern is critical—under-crimping can lead to slippage; over-crimping can damage the strap.
- Consistent tension: Apply repeatable tension appropriate to the load and strap type.
Floor Type Compatibility
These seals are used as part of a strapping system rather than a floor-installed product. They can be used in typical packing environments such as warehouses, goods-in/out areas and production lines. Keep seals dry and stored in a way that prevents contamination (dust/oil) that could affect handling and sealing consistency.
Health and Safety
- Wear suitable hand protection when handling strapping and metal seals to reduce the risk of cuts.
- Use eye protection where strapping recoil is possible during tensioning or cutting.
- Only use strapping tools as intended and keep hands clear of crimping areas.
- Dispose of used seals and strap offcuts safely to avoid sharp hazards.
Ideal Applications and Use Cases
Semi-open metal seals are commonly used for general packaging and logistics tasks, including:
- Carton reinforcement: Adding security to heavier cartons or multi-box consignments.
- Bundling: Keeping grouped items together for storage or transport.
- Pallet stability: Supporting stretch wrap by adding strap restraint around the load.
- Warehouse despatch: Fast, repeatable sealing for routine shipments.
Maintenance, Cleaning and Care
- Storage: Keep seals in their packaging until use and store in a dry area to minimise corrosion risk.
- Tool condition: Inspect sealers/combination tools regularly; worn jaws can reduce seal performance.
- Process checks: Periodically check sealed joints for consistent crimp quality, especially after tool changes or strap changes.
Case Study (Typical Workflow Example)
A warehouse despatch team straps mixed cartons onto pallets for courier collection. After tensioning the strap around the pallet load, they apply a semi-open metal seal and crimp it using a compatible sealer. This provides a repeatable closure method that helps keep loads stable during forklift handling and vehicle movement. By standardising on a common seal size and maintaining tooling, the team improves consistency and reduces rework caused by poor seals.
Who Is It For?
- Warehouses and fulfilment centres running routine strapping operations
- Manufacturers bundling products for internal movement or outbound shipping
- Packaging teams needing a dependable, tool-applied seal for strapping
Colours / Features Available
Metal seals are typically supplied in a standard metal finish. Where coatings/finishes are offered, they are usually specified by the supplier. Refer to the product options on this page for the available variants.
Sizes Available
This product page represents the 12mm x 25mm semi-open seal format. If you require alternative seal sizes or different seal styles (e.g., open seals, closed seals, buckles), please check the related strapping accessories range.
Need help choosing the right seal?
Match the seal to your strap width and strap type, then confirm the correct sealer/combination tool for that seal style. If you share your strap type and tool model, we can help point you to the most suitable option.
Reference pages used for general specification alignment:
UK Packaging – Semi Open Strapping Seals 12mm x 25mm: https://www.ukpackaging.com/strapping-seals-smooth-semi-open-semi-open-strapping-seals-12mm-x-25mm
Davpack – Polypropylene Strapping Seals 12x25mm Semi Open: https://www.davpack.co.uk/strapping-securing/polypropylene-strapping/strapping-seals-2/polypropylene-strapping-seals-12x25mm-semi-open_GSO-12.htm
Hub Packaging – Semi-Open Seals 12mm x 25mm (Standard Duty): https://shop.hub-packaging.com/products/semi-open-seals-12mm-x-25mm-standard-duty.html
Antalis – Standard Semi Open Strapping Seals 12x25mm (Box 2000): https://www.antalis.co.uk/eshop/packaging-supplies/strapping/strapping-accessories/buckles-and-seals/standard-semi-open-strapping-seals-12x25mm-box-2000-PDP-HQ03163/SKU-711790