Oxidation Resistant Crack Resistant Customization HDPE Empty Silicone Sealant Cartridge. HDPE Material Construction: Made from 100% virgin High-Density Polyethylene for superior chemical resistance and structural integrity. Airtight Leak-Proof Design: Precision-engineered plunger system creates an absolute barrier against air and moisture to prevent premature curing. Smooth Extrusion Experience: Ultra-smooth inner wall minimizes friction, allowing effortless extrusion of high-viscosity sealants with standard guns. Burst-Resistant Durability: Reinforced thick walls withstand high pressure during automated filling and manual gunning without rupturing. Custom Branding Options: Available as blank tubes or with premium printing options including silk-screen, offset, and In-Mold Labeling. Versatile Chemical Compatibility: Ideal for RTV silicone, acrylic caulks, polyurethane, and heavy-duty construction adhesives like liquid nails.