Friction Reducer (Slickwater FR Concentrate) Storage & Tank Compatibility

Storing Friction Reducer (Slickwater FR Concentrate)? Start Here

A slickwater friction reducer (FR) is not a single compound but a formulated product. The bulk concentrate shipped and stored on a frac site is most commonly a water-in-oil (inverse) emulsion: a partially hydrolyzed polyacrylamide is dispersed in a petroleum-distillate / mineral-oil carrier together with a nonionic inverting surfactant and minor stabilizers. When metered into the blender it “inverts,” releasing the polymer into water at fractions of a percent to suppress turbulent drag and lower wellhead pumping pressure.

For a tank buyer the key point is the carrier. Although the diluted slickwater pumped downhole is nearly all water, the concentrate that actually sits in your day tank is a hydrocarbon emulsion. Material of construction (MOC) matters because that distillate oil permeates and swells polyethylene and degrades hydrocarbon-sensitive elastomers — so the storage decision must follow the carrier, not the water.

Is polyethylene (HDPE / XLPE) safe for slickwater FR concentrate?

No — not for the neat concentrate. Common slickwater friction-reducer concentrates are inverse emulsions built on a petroleum-distillate / mineral-oil carrier. Hydrocarbons in that carrier class are absorbed by and swell HDPE and crosslinked polyethylene (XLPE), causing softening, stress and eventual failure of poly tanks. For that reason we rate the neat emulsion U (unsuitable) for polyethylene and direct storage to steel (UL-142 or lined), stainless, or resin-matched FRP.

Two honest caveats: (1) the field-diluted slickwater (after inversion into water) is overwhelmingly aqueous and is far gentler on poly — that diluted fluid is treated on its own page; and (2) some suppliers offer dry/powder or genuinely water-based FR systems with no oil carrier, which can be poly-compatible. Always confirm the carrier on the product SDS before selecting a tank, and match elastomers (Viton/FKM, PTFE) to the hydrocarbon carrier as well.

Material compatibility at a glance

Store and handle neat slickwater friction-reducer concentrate (the inverse oil-emulsion) in steel (UL-142 or lined), stainless steel, or resin-matched FRP — NOT in HDPE/XLPE. The petroleum-distillate carrier oil is the controlling factor: it permeates and swells polyethylene and attacks hydrocarbon-sensitive elastomers. Use Viton/FKM or PTFE for seals; avoid EPDM. The aqueous, diluted slickwater used downhole is largely water and is far less aggressive to poly, but the bulk-stored concentrate is an oil emulsion and must be treated as a hydrocarbon product.

Ratings: S suitable · C conditional / limited · U unsuitable. Verify against the cited resistance charts and your concentration/temperature before specifying.

The safety that actually matters

• Aspiration hazard (H304): the petroleum-distillate carrier can be fatal if swallowed and drawn into the lungs — never siphon by mouth; induce vomiting only if directed by poison control.
• Combustible carrier: many FR concentrates are combustible liquids — keep away from heat, sparks and open flame; bond and ground during transfer; confirm flash point on the SDS.
• Skin and eye irritation: wear chemical-splash goggles and nitrile gloves; the surfactant and carrier can defat and irritate skin.
• Slip hazard: spilled emulsion (and any inverted polymer) becomes extremely slippery on wet surfaces — contain and clean promptly.
• Aquatic effects (H413, representative): prevent release to drains, soil and surface water; dike storage and have spill absorbent on hand.
• Always defer to the specific supplier SDS for exact flash point, pH, pictograms and H-codes — formulations vary widely between vendors.

Common questions

Can I store slickwater friction reducer in a poly (HDPE/XLPE) tank?

Not the neat concentrate. The standard FR concentrate is an oil-carrier emulsion, and the petroleum-distillate carrier permeates and swells polyethylene over time. Use steel (UL-142 or lined), stainless, or resin-matched FRP. Confirm the carrier on the product SDS, because a few water-based or dry FR products have no oil carrier and can be poly-compatible.

Why is it rated unsuitable for poly when slickwater is mostly water?

Two different fluids. The slickwater pumped downhole is the diluted, mostly-aqueous fluid. The product in your storage tank is the concentrate — a water-in-oil emulsion whose continuous phase is a petroleum distillate. Tank selection follows what is actually stored, and a hydrocarbon carrier rules out polyethylene.

What elastomers and seals should I use?

Match the hydrocarbon carrier: Viton/FKM and PTFE perform well for gaskets, pump seals and valve seats. Avoid EPDM and other hydrocarbon-sensitive rubbers, which swell in the carrier oil.

Is friction reducer flammable?

It depends on the carrier and must be read off the SDS. Many emulsion concentrates are combustible liquids with the petroleum-distillate carrier driving the rating, and the carrier also creates an aspiration hazard (H304). Treat it as a hydrocarbon product: bond, ground and keep ignition sources away.