Guide · comparison
Food-grade vs technical-grade: the difference is a paper trail
Most IBC bottles are moulded from HDPE resin that is acceptable for food contact. That fact is sometimes used to sell "food grade" totes that are nothing of the kind. The real dividing line is whether anyone can tell you what was in the bottle before.
Need food-stream totes?
Tell us the product and your audit requirements. A partner supplier will follow up; confirm content history and documentation with them before you buy.
The two categories, precisely
Food-grade
- ＋Food-contact-compliant HDPE bottle: new, or with a documented edible history.
- ＋Prior fills known and traceable to the filler.
- ＋Cleaning method matched to the residue: alkaline wash for fats, hot rinse for sugars.
- ＋Odour check and water-sample check performed and recorded.
- ＋Gasket suitable for potable service; plastic or composite pallet.
- ＋Content history supplied with the unit.
Technical grade
- −Physically the same tote, same ratings, same cage.
- −Prior content industrial, or documented but non-edible.
- −Washed or rinsed to a stated method.
- −No food-contact claim, and none implied.
- −Gasket chosen for the next chemistry, not for potable service.
- −Usually costs less than a food-grade unit.
What permeation means for a buyer
HDPE is a semi-crystalline polymer whose amorphous regions can absorb some non-polar molecules. Store a solvent, citrus oil, mint oil or diesel in it for months and some of it migrates into the wall. Empty the tote and wash it thoroughly, and the wall can slowly release what it absorbed into the next liquid.
This is why some prior contents permanently rule a bottle out of food service. A solvent-history bottle should never become a food bottle, and a flavour-extract bottle can taint a neutral product long afterwards. The cage and pallet are unaffected, which is exactly why rebottling exists: replace the one component that remembers.
The claims to walk away from
- "Food grade: HDPE is FDA approved." True of the material, silent about the history.
- "Triple rinsed, so it is food safe." Rinsing addresses residue, not permeation.
- "Previously held food products." Which ones? Who filled them? A category is not a record.
- "Food grade, cheapest on the market." Documentation takes work. If it is the cheapest, ask what was skipped.
Decision table
| Your product | Minimum specification | Why |
|---|---|---|
| Drinking water storage | Rebottled | A new bottle removes the history question |
| Syrup, brine, molasses | Food-grade used | Robust product, documented history usually sufficient |
| Edible oils | Food-grade used after alkaline wash, or rebottled | Fats need heat and surfactant to remove |
| Flavours, extracts, essential oils | Stainless | Terpenes can permeate HDPE |
| Cosmetics, lotions | Rebottled | Odour sensitivity and audit exposure |
| Pet food additives | Food-grade used | Often held to a food standard |
| Glycol, coolant | Technical | No food contact |
| Detergents, surfactants | Technical | No food contact |
| Fertiliser | Technical / Grade B | No food contact |
| Fruit juice concentrate | Rebottled | Pigment staining obscures inspection |
This is general product information. Check current food-safety regulations and your own audit standard, and confirm documentation with the supplier.
Questions people actually ask
Does FDA-compliant HDPE make a tote food grade?
No. It means the material is acceptable for food contact. Whether a specific used tote is suitable depends on everything that has been inside it, which is a documentation question rather than a materials question.
Can a technical-grade tote be upgraded to food grade?
In practice only by replacing the bottle. If the prior contents were non-edible, cleaning does not restore a defensible food-contact claim, but a new bottle can, and it keeps the cage in service.
How much more does food grade cost?
It depends on the supplier, the documentation and whether the bottle is new. Pricing is by quote from partner suppliers.
Permeation risk by prior content
| Prior content | Permeation risk | Reversible? | Food stream |
|---|---|---|---|
| Water, brine, sugar solutions | Low | n/a | Possible with documentation |
| Fruit juice and concentrate | Low (staining likely) | n/a | Possible with documentation |
| Edible oils | Low | Usually, with alkaline wash | Possible with documentation |
| Vinegar | Low to moderate | Usually; check odour | Possible after odour check |
| Dairy | Low | Usually, with alkaline wash | Possible; declare allergens |
| Mint, citrus, garlic extracts | High | No | No |
| Essential oils generally | High | No | No |
| High-strength ethanol | Moderate to high | Partially | Case by case; stainless preferred |
| Surfactants, detergents | Low | Yes | No: non-edible history |
| Glycols | Low | Yes | No: non-edible history |
| Mineral oils | Moderate | Partially | No |
| Solvents | Very high | No | No |
| Fuels | High | No | No |
| Pesticides, herbicides | High | No | No |
| Unknown | Unknowable | No | No |
Mint and citrus surprise people: both are food products, yet both can permeate HDPE enough that the bottle flavours a neutral liquid long afterwards. Treat this table as general guidance and confirm content history with the supplier.
What "food grade" means, in plain language
"Food grade" is not a regulatory category for used containers in the way people often assume. What exists are rules about food-contact materials.
The material rules
FDA food-contact regulations cover polyethylene resins such as the HDPE used in IBC bottles. Most IBC bottles are moulded from compliant resin.
Those rules address the material. They say nothing about what has since been put inside a specific container, which is the whole question when you are buying used.
What fills the gap
For reused containers, the gap is filled by the supplier’s records of prior content and cleaning, or it is not filled at all. A defensible food claim generally needs compliant resin, a documented edible-only history and suitable cleaning, or a new bottle.
What an auditor is likely to ask
For the history, the cleaning records, and a link between both and the physical unit. Check current regulations and your own audit standard, and confirm documentation with the supplier.
More food-grade questions
Is there a test that proves a tote is food safe?
Not a simple one. Laboratory testing can show the absence of specific residues, but it is specialised. In practice, a documented history plus suitable cleaning is what buyers and auditors usually rely on, and a new bottle removes the question.
Can I check a tote myself?
You can smell the open bottle, fill a sample with clean water, leave it a while and smell that. It is not laboratory analysis, but it catches the most important failure.
Why are food-grade totes harder to find?
Because the constraint is sourcing: a unit can only go into the food stream when every prior fill is known, and that narrows the pool.
A decision tree in table form
| Question | If yes | If no |
|---|---|---|
| Does the liquid touch food, drink, skin or animals? | Continue | Technical grade. Stop here. |
| Is it water for drinking? | New bottle (rebottled or new tote). | Continue |
| Is it aroma or flavour sensitive? | Rebottled or stainless. | Continue |
| Will an auditor examine the container? | Continue | Documented food-history used is usually fine |
| Can the supplier document every prior fill? | Food-history used | Rebottled. |
| Does your programme exclude specific allergens? | Check the declaration; rebottle if in doubt | Food-history used |
| Is the fill temperature high? | Check the bottle’s limit; consider stainless. | Poly is usually fine |
| Is it high-strength alcohol? | Consider stainless. | Poly is usually fine |
General product information. Check current regulations and your audit standard, and confirm documentation with the supplier.
More food-grade questions
Is "FDA approved" a real thing for containers?
Not as a container-level approval. FDA rules cover food-contact materials, and a resin can comply with them. Calling a used container "FDA approved" is loose language.
What is the most economical defensible food specification?
Often a used unit with a genuinely documented food history and an odour check. If the documentation is thin, a rebottled unit is the safer option. Pricing is by quote from partner suppliers.
Can technical-grade totes be used for animal feed?
Feed is often held to a food standard for prior-content purposes. Ask for a food-history unit and check your own requirements.
Where people go from here
Reuse first, then recycle.