The Chem-Tainer 35 Gallon Vertical Double Wall Liquid Chemical Storage Tank (SKU TC2435DC) puts a 35-gallon primary tank inside an integral secondary containment shell on a single 24 x 24 inch footprint, standing 35 inches tall. It is molded in Natural White polyethylene and carries a 1.9 specific gravity rating, the number that decides whether this tank is right for your chemical. The built-in outer wall gives you secondary containment without pouring a separate berm, so it fits indoor day tanks and tight equipment rooms where a spill cannot reach a floor drain. If you are shopping double wall tank options in the 35 gallon vertical storage tank range, this is one of the smallest-footprint configurations available.
Will it work for your application?
Full of water this tank carries roughly 292 pounds of contents; loaded to its maximum rated capacity it holds about 555 pounds, which corresponds to the 1.9 SG rating across the full 35 gallons. Use those two weight figures when you size a stand, a scale, or a drip pan, and run them through the Tank Sizing Calculator or the Tank Sizing Guide if you are matching the tank to a metering pump duty cycle. The 24 x 24 inch base and 35-inch height make it a true vertical storage tank in a small double wall package. Outlets and bulkhead fittings are configured separately and are not pre-specified for this SKU, so for fitting sizes, outlet locations, and the gap between the inner and outer walls, see the technical drawing on this page rather than estimating from the photo, or call 866-418-1777 to confirm a port layout before you order.
Chemical compatibility
This is a polyethylene tank rated to 1.9 specific gravity. The resin is recorded as HDLPE, but because that value is unconfirmed, confirm HDLPE versus crosslinked (XLPE) with us before committing it to chemical service - the distinction changes which chemicals and concentrations the wall will tolerate over time. Just as important, fittings and gaskets are part of the spec, not an afterthought: the materials called for across these chemicals are PVC, CPVC, PP, and 316 stainless for fittings, and EPDM, Viton, or Aflas for gaskets. The wrong gasket on a chemically correct tank is the most common failure on a chemical-service install, so check the gasket column for your chemical, not just the tank wall. Every recommendation below is concentration-, fitting-, and gasket-specific; always verify against the OEM chemical-resistance chart for your exact concentration and temperature, and use our Chemical Compatibility Database to drill into each one.
Common chemical-service matches for this tank include sodium hypochlorite under 16.5% with PVC fittings and Viton gaskets; hydrochloric acid at 37% with PVC and Viton; phosphoric acid at 85% with PVC and Viton; hydrogen peroxide at 50% with PVC and Viton; ferric chloride at 50% and aluminum sulfate at 50%, both with PVC and EPDM; potassium hydroxide saturated and sodium carbonate at 30% with PVC and EPDM; calcium chloride at 40% and magnesium chloride at 30% with PVC and EPDM; acetic acid at 60% with PP/PVC and EPDM; hydrofluoric acid at 48% with PP/PVC and Viton; plus ethylene glycol, propylene glycol, urea solution, and ozonated water up to 10 PPM.
Three chemicals on this list are the buyer traps - do not reach for standard PVC. Sulfuric acid at 98% needs CPVC fittings with a Viton gasket. DEF at 32.5% and peracetic acid at 30% both require 316 stainless fittings, and peracetic acid is the one chemical here that demands an Aflas gasket (DEF runs on EPDM). Match the fitting and gasket material listed for your chemical exactly; a plastic fitting where the chart calls for metal, or an EPDM gasket where it calls for Viton or Aflas, is how a correctly chosen tank still fails.
The mistake to avoid
The number that catches buyers on this tank is the 1.9 specific gravity rating. SG measures how much heavier than water your chemical is, and a tank rated to 1.9 is built for dense liquids - but that rating does not override the resin question. A saturated potassium hydroxide stream and a 98% sulfuric acid stream both fit within 1.9 SG yet demand very different wall chemistry, so settle the HDLPE-versus-XLPE question first, then confirm the chemical against the OEM chart at your operating concentration and temperature. Do not assume the chemicals listed above are exhaustive, or that a stronger concentration carries over from a weaker one.
Because this is a double-wall containment tank, it is a natural fit for SPCC and spill-readiness programs - our SPCC 40 CFR 112 double-wall compliance walkthrough and the high-level alarm and spillover-redundancy guide walk through the secondary-containment and overfill protection that pair with a tank like this. This 35-gallon double wall tank ships LTL freight from the Chem-Tainer plant in Marked Tree, Arkansas, quoted live to your ZIP code. Get a freight quote with our Freight Cost Estimator, browse the Chemical Compatibility Database for your specific chemical, or call 866-418-1777 to confirm fittings, secondary-containment requirements, and resin before you order.
