Chem-Tainer R121818A-BLACK — Complete Reference
The Chem-Tainer R121818A-BLACK is a 18 Gallons rectangular utility tank in black, molded from polyethylene. Low-profile rectangular utility tank for transport or stationary installations where vertical clearance is limited.
This page is the complete reference for the R121818A-BLACK: specs, compatible accessories, installation, freight, and warranty. Every number is sourced from the Chem-Tainer 2025 product catalog.
At-a-Glance
| Manufacturer Part Number | R121818A-BLACK |
| Brand | Chem-Tainer |
| Product Class | Rectangular Utility Tank |
| Capacity | 18 Gallons |
| Material | Polyethylene |
| Color | Black |
| Length | 20" |
| Lid / Manway | 5" |
| Shipping Weight | 12 lb |
| Warranty | 1-year limited warranty (2-year on select industrial models) |
| Freight Class | LTL, NMFC 156600 |
Physical Profile
Single-piece rotomolded construction. Wall thickness is specified by the manufacturer in the engineering drawing linked above.
Chemical Compatibility & Specific Gravity
Polyethylene tanks have specific gravity ratings. SG 1.0 = water-rated. Higher SG = denser fluid handling. Always match the stored liquid's density to the tank's rating.
| Fluid | SG | Rating |
|---|---|---|
| Water, potable | 1.00 | Fully rated |
| Ag liquid fertilizer (10-34-0) | 1.40 | Within rating for SG ≥ 1.5 tanks |
| Saturated brine | 1.20 | Within rating |
| 12.5% sodium hypochlorite (bleach) | 1.20 | Within rating; UV exposure reduces bleach shelf life |
| Sulfuric acid, <30% | 1.25 | Within rating for XLPE tanks only; confirm with our team |
| Diesel fuel, motor oil | 0.85–0.90 | NOT rated — permeation concern |
| Concentrated acids (>30%) or strong solvents | varies | NOT rated — material attack |
For fluids not listed, call 866-418-1777 — we maintain a chemical compatibility chart that cross-references manufacturer material science with real field performance.
Typical Applications
- Low-profile bulk liquid storage where height clearance is limited
- Pickup-bed or trailer-mount transport
- Chemical mixing / reservoir for 12-volt spray pumps
Installation Checklist
- Install on a flat, level surface that extends 4 inches beyond the tank footprint
- Use Teflon tape on threaded outlets; do not over-torque (max 15 lb-ft)
- Fit a vented lid when drawing fluid above 5 GPM to prevent vacuum collapse
Shipping & Freight
At 18 gallons, this SKU typically ships UPS or FedEx small-parcel when empty weight is under 70 lb.
Warranty & Certifications
1-year limited warranty (2-year on select industrial models). Keep your One Source Plastics order confirmation — it's the warranty-claim trigger.
When This Product Is the Wrong Choice
- Pressurized service — these are atmospheric-vent-only tanks
Cross-Reference
| Supplier | Their SKU |
|---|---|
| One Source Plastics | R121818A-BLACK |
| Chem-Tainer | R121818A-BLACK |
FAQ
Is the Chem-Tainer R121818A-BLACK in stock?
Stock is split across manufacturer warehouses. We pull current inventory when you add to cart; if regional stock is short you'll see a ship-date estimate before checkout.
How fast does the R121818A-BLACK ship?
In-stock units typically ship within 3 business days of order confirmation. Out-of-stock units build on a 2-6 week cycle depending on the manufacturer. Call 866-418-1777 for a firm date.
Does the R121818A-BLACK include fittings?
The base tank ships with the manufacturer's standard fitting package. Upgraded bulkheads, flex connectors, or threaded outlets are separate line items — our team confirms fitment before shipping.
What warranty applies to this tank?
1-year limited warranty (2-year on select industrial models). Keep your order confirmation — it's the claim trigger.
Can I download the technical drawing?
Yes. The branded View Technical Drawing button above your purchase links to the manufacturer's engineering PDF. Also appears in the Additional Information tab.
Questions about fitment, freight, or chemistry?
Our team has the Chem-Tainer catalog in front of them. Call 866-418-1777 or request a quote with MPN R121818A-BLACK ready.
Related Chem-Tainer Products
Sources: Chem-Tainer 2025 product catalog. Specs verified against manufacturer-issued engineering drawings. Price and freight subject to change — see current listing above.
