The IBC tote is brilliantly designed for water-like liquids. It is less brilliantly designed for products that do not want to flow. Customers regularly call us about totes containing molasses, honey, polymer adhesive, certain pastes, and cold-weather waxes — products that have flowed beautifully into the tote and are now refusing to flow back out.
Heat first
Most viscous products have a pour point above their storage temperature. Bring the tote up to about 20°F above pour point and most of them flow normally. Silicone band heaters around the cage work; insulated jackets work; a heated warehouse over 24 hours works. Direct heat with a torch never works and creates a fire hazard.
Then air assist
For products that still flow slowly even when warm, a small positive-pressure assist on the fill cap helps enormously. A regulated 1–2 PSI from a small compressor at the fill cap displaces the product through the discharge faster than gravity alone. Important: 1–2 PSI is well below the working pressure of the tote. Do not go above 3 PSI; a tote pressure-rated for 14 PSI is rated for static, not dynamic, and a sudden over-pressure can rupture a discharge seal.
Then tip
A tote tipper is a mechanical fixture that tilts the tote on its corner to drain the final 15–20% of product. They are sold by several specialty equipment vendors; we stock two in our own yard. A tipped tote drains at a meaningfully steeper angle and the last drops actually leave the bottle instead of pooling in a corner.
When none of this works
A small percentage of viscous products genuinely cannot be drained from a standard IBC without unacceptable residue. For those products, the answer is a larger discharge valve, a different tote design (some manufacturers make conical-bottom totes specifically for viscous products), or a switch to a different container format entirely.