Products: 0
Key Features:
These high-quality black phenolic caps feature a durable cone-shaped LDPE liner (polycone) that compresses inside the bottle neck to form a tight, leak-resistant seal. Perfect for protecting sensitive formulations from air, moisture, and contamination.
These caps are commonly used in laboratory, cosmetic, and aromatherapy packaging for essential oils, chemical solutions, and natural remedies. Their rigid structure and excellent chemical resistance make them ideal for products requiring extra stability and protection.
Recommended Uses: Essential oils, carrier oils, extracts, lab reagents, and other moisture-sensitive or volatile formulations.
Neck Compatibility: 18-400 caps fit 2 oz Boston Round bottles; 20-400 caps fit 4 oz Boston Round bottles; 28-400 caps fit 8 oz, 16 oz, and 32 oz Boston Round bottles.
*Polycone liners create a reliable barrier seal, ideal for preserving product quality and preventing leaks during shipping or storage.