Syrup Bottle Caps

About

These are DIN 28 polypropylene caps designed specifically for glass syrup bottles. Available in black and white, with sizes covering the full standard range — 30 ml, 60 ml, 100 ml, 125 ml, 150 ml, 200 ml, and 250 ml — each cap includes a PE foam liner that creates a leak-resistant, tamper-evident seal. They're sold wholesale by the box and priced per unit, so you're buying exactly what your production run needs without paying for packaging you don't. Browse our glass syrup bottles to find the matching bottles, or explore the full closures collection for other closure types. What DIN 28 Means — and Why It Matters DIN 28 is the international standard neck finish for pharmaceutical and medical-grade syrup bottles. The "28" refers to the outer diameter of the bottle neck in millimeters, and the DIN standard specifies the thread pitch and height so caps and bottles from any manufacturer fit together consistently. It's not interchangeable with standard 28/400 closures used on food and cosmetic bottles — the thread geometry is different. So if you're packaging cough syrups, oral suspensions, herbal liquid extracts, or compounded liquid medications in glass syrup bottles, you need DIN 28-specific caps. That's what these are. Each one fits precisely, seats flush, and won't back off or leak under normal handling and shipping conditions. Applications: Who Uses These Caps The primary buyers for DIN 28 syrup bottle caps are companies working in pharmaceutical compounding, nutraceuticals, herbal medicine, and veterinary liquid formulations. But the use cases stretch further than that. Small-batch producers of liquid vitamins, elderberry syrups, immune supplements, and functional wellness tonics all use these same caps because the bottles — and by extension the closures — come from the pharmaceutical supply chain. The glass is inert and easy to sterilize, the DIN 28 seal holds up through hot-fill processes, and the tamper-evident ring gives end consumers a clear visual indicator t