Description

The Aluminum Cap GPI 38/400 is a pharma-grade aluminum closure for glass pill and supplement bottles, offering a lightweight yet secure alternative to plastic caps. It follows the GPI 38-400 thread standard and fits 30ml-150ml packer and pill glass bottles, so it provides a reliable, leak-proof seal.

Material & Construction

Pharma/food-grade aluminum construction gives this cap its light weight, excellent corrosion resistance, and durability. In addition, aluminum is 100% recyclable, and manufacturers can reuse it repeatedly without any loss of physical or molecular properties. As a result, this closure remains fully sustainable, with zero environmental footprint. It also resists high temperatures, does not age over time, and is not flammable. Unlike plastic closures, aluminum keeps its shape and seal quality even after repeated opening and closing.

Key Features

Choosing the Aluminum Cap GPI 38/400 means combining functional performance with environmental responsibility:

• Lightweight, pharma/food-grade aluminum construction
• 100% recyclable and reusable without loss of quality
• UV-stable, with no expiration date
• Resistant to high temperatures; non-flammable
• Smooth surface suitable for printing and branding
• Consistent GPI 38-400 thread fit for a secure, leak-proof closure

Where the Aluminum Cap GPI 38/400 Is Used

The Aluminum Cap GPI 38/400 secures pills, tablets, capsules, and food supplements in smaller glass packer and pill bottles (30ml-150ml), keeping them safe and intact throughout the supply chain. Its smooth surface also makes it a popular choice for nutraceutical and cosmetic brands that want a premium, printable finish.

Compatible Liners

For an extra layer of protection, you can combine this cap with a compatible EPE Liner, PRESS Liner, or IHS Liner, all available in the matching 38/400 size.

Also Available

Need a larger bottle closure? See the Aluminum Cap GPI 45/400. Alternatively, if you prefer a TIN closure, the TIN Cap GPI 38/400 fits the same bottle neck. For custom colors, an embossed logo, or any other special requirement, contact us and our team will help you find the best solution.

Manufacturing & Quality

AlumCap Ltd manufactures this cap in the EU. It holds FSSC 22000, GMP, ISO 9001:2015, and ISO 14001 certification for consistent pharma-grade quality. In addition, our team quality-checks every batch before shipping, ensuring consistent thread fit and sealing performance across production runs.

Aluminum Cap vs TIN Cap: Which One Do You Need?

Frequently Asked Questions

What is the difference between this cap and the TIN Cap GPI 38/400?

This cap is aluminum – lighter and 100% recyclable. The TIN Cap uses tinplate for extra rigidity and a firmer seal. Both fit the same GPI 38-400 thread.

Does this cap come with a liner?

No, it ships without a pre-fitted liner. You can add a compatible EPE, PRESS, or IHS Liner separately, in the matching 38/400 size.

What size bottles does this cap fit?

The GPI 38-400 thread fits 30ml-150ml packer and pill glass bottles.

Can I get custom colors or a logo on this cap?

Yes, we offer custom cap colors and embossed logo branding. Contact us to discuss quantities and options.

• Storage: Keep in a cool, dry place away from direct sunlight and humidity, in the original packaging until use.
• Capping application: Apply with standard capping machinery, using consistent torque for a secure, tamper-evident seal without over-tightening.
• Handling: Use clean, dry equipment — aluminum’s soft surface can scratch or dent if mishandled.
• Shelf life: No expiration date under proper storage; the cap is UV-stable and resistant to aging, corrosion, and high temperatures.