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Reference

Chemical compatibility — HDPE vs composite vs stainless.

Forty chemistries, three materials, the quick read. This table is a starting point — for anything aggressive or unfamiliar, confirm with the SDS and ask us.

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ChemistryHDPECompositeStainless
Water, brine ≤ 25%
Glycol (ethylene / propylene)
Soap, surfactants
Lubricant base oil
Vinegar (5%)✓ (Grade A)✓ (316L)
Edible oils, syrups✓ (Grade A)✓ (316L)
Fruit juice, cider✓ (Grade A)✓ (316L)
Beer wort, brewing rinse✓ (Grade A)✓ (316L)
Bleach (NaOCl) ≤ 12%✓ (316L)
Hydrochloric acid 10%
Hydrochloric acid 30%
Sulfuric acid 30%caution
Sulfuric acid 50%
Nitric acid 30%✓ (304L)
Sodium hydroxide 30%
Acetonecaution
Methyl ethyl ketone (MEK)
Toluene
Xylene
Methylene chloridecaution
Isopropyl alcohol
Ethanol (≤ 70%)
Diesel fuel
Gasoline / petrol✓ (UN)
Biodiesel (B100)
Used cooking oil
Liquid fertilizer (urea, ammonium)
Pesticide concentratevaries✓ (UN)
Pool chlorine 10%✓ (316L)
Glycerin
Latex paint base
Solvent-borne paint
Hydrogen peroxide ≤ 35%caution✓ (316L)
Ammonia (aqueous ≤ 25%)
Citric acid
Phosphoric acid 50%
Honey, molasses✓ (Grade A)✓ (316L)
Maple syrup (hot pack)caution (158 °F)✓ (316L)
DEF (urea solution)
Industrial detergent concentrate

Legend — ✓: rated compatible at ambient temperature; caution: short-term ok, monitor; —: not recommended; UN: must use UN-certified IBC. Always cross-reference with the chemistry's SDS and your operating temperature.

How to actually use this table

The four steps from chemistry name to tank order.

Step 1: identify the actual chemistry, not the brand name. Brand names hide formulations. A 'cleaner' might be sodium hypochlorite, sodium hydroxide, surfactant blend, or a peracetic acid concentrate — each has different compatibility. Get the SDS and find the active ingredients.

Step 2: find the worst-case concentration. A chemistry that's stable at 10% may not be at 30%. Use the concentration you'll actually be storing or transferring, not a vague 'industrial.'

Step 3: think about temperature. HDPE handles most chemistries fine at ambient. At 130 °F sustained, many ✓ ratings turn into caution. Above 158 °F sustained, HDPE is out for most chemistries regardless of compatibility at ambient.

Step 4: think about contact time. Permeation is a function of time. A chemistry that's marked caution may be fine for transfer (minutes of contact) and not fine for storage (months of contact). The table assumes storage; transfer applications can sometimes use a material with a worse rating.

Step 5 (the bonus step): when in doubt, ask us. We've seen the failure modes for most of these chemistries in the field. Email the SDS and we'll tell you what we'd actually use.

Key takeaways

If you only read one section.

  1. 01Get the SDS. Brand names hide the chemistry.
  2. 02Concentration matters. 10% and 30% can be different compatibility.
  3. 03Temperature compounds risk. Above 130 °F, downgrade your confidence.
  4. 04Contact time matters. Permeation is integrated over time.
  5. 05When in doubt, escalate to composite or stainless. The cost delta is smaller than a contamination event.
Common questions

Compatibility questions.

Is the table comprehensive?
No. It's the chemistries we get asked about most. If yours isn't here, send us the SDS and we'll tell you what we'd use.
Where does the data come from?
Cross-referenced from Mauser/Schütz compatibility datasheets, the Plastics Industry Association compatibility tables, and our own field observations from 18 years of yard intake. Where sources disagreed, we used the more conservative rating.
Can I rely on this table for a regulatory filing?
No — use the manufacturer's compatibility datasheet for regulatory documentation. Our table is a starting point, not a deliverable.
What about mixed chemistries?
Mixes are unpredictable. If you're storing a blend, identify the component with the most aggressive compatibility profile and spec to that. When in doubt, composite or stainless.