1.5 SG vs. 1.9 SG: Which Tank Do You Need?
Both ratings use the same tank sizes and fittings. The difference is wall thickness, which sets how heavy a liquid the tank can safely hold.
| 1.5 SG · White | 1.9 SG · Light Blue | |
|---|---|---|
| Max liquid weight | Up to 12.5 lb/gal | Up to 15.8 lb/gal |
| Walls | Thicker than a standard water tank | Heaviest walls in the line |
| Typical uses | Liquid fertilizers, DEF, water treatment chemicals, waste oil | Heavier fertilizer blends, brines, dense process liquids |
| Sizes | 1,000 / 1,500 / 2,500 / 3,000 gal | 1,000 / 1,500 / 2,500 / 3,000 gal |
| Fittings | 1.5" inlet, 2" outlet, 16" manway lid | 1.5" inlet, 2" outlet, 16" manway lid |
How to Pick the Right Tank
Find your liquid's weight
Check the Safety Data Sheet (SDS) for specific gravity, or divide its weight per gallon by 8.33. Example: 11 lb/gal ÷ 8.33 = 1.32 SG.
Choose the rating
Pick a tank rated at or above your liquid's SG. Up to 1.5 SG, choose white. Between 1.5 and 1.9 SG, choose light blue. If you're close to the limit, size up.
Confirm compatibility
Make sure your chemical works with polyethylene and the fitting materials. Use the chart in the Elkhart Technical Guide or ask your supplier.
Frequently Asked Questions
Can I store acids or other aggressive chemicals?
Are the 1.5 and 1.9 SG tanks the same size as the water tanks?
What temperature can these tanks handle?
Can I add valves or extra fittings?
How long do they take to ship?
What's the warranty?
Not Sure Which Rating You Need?
Send us your chemical's name or SDS and how much you need to store. We'll recommend the right tank and quote freight to your location.

