The IPS2050-P-S1 is the one-line stainless steel propeller in the IPS2050 overhead stirrer accessory line — sold separately at $110 for use on the OS-20L (IPS2050-20 / -20-E) and OS-40L (IPS2050-40 / -40-E) overhead stirrer chassis. The one-line propeller geometry produces predominantly axial flow through the vessel — the right impeller for suspending particulates and maintaining homogeneity in low-to-medium viscosity workflows without inducing vortex formation that would entrain air.
Key Specifications
| SKU | IPS2050-P-S1 |
| Type | One-line propeller, stainless steel |
| Flow pattern | Axial flow (top-to-bottom or bottom-to-top through vessel depending on rotation direction) |
| Material | Stainless steel (general-purpose chemistry compatibility — aqueous, mild solvents, neutral-pH formulations) |
| Compatible chassis | IPS2050-20 / -20-E (OS-20L) and IPS2050-40 / -40-E (OS-40L) overhead stirrers |
| Mounting | Feed-through chuck on chassis — tool-less tightening / loosening for fast accessory swaps |
| Family sister SKUs | IPS2050-P-S2 (centrifugal impeller), IPS2050-P-S3 (paddle w/flat holes), IPS2050-P-S4 (4-arm — default included with chassis) |
| Teflon equivalent | IPS2050-P-T1 (one-line Teflon — aggressive-solvent / high-acid / high-base compatibility) |
| List price | $110 |
Why a One-Line Propeller — Axial Flow Selection
| Impeller geometry | Flow pattern | Best for |
| One-line (this product) | Axial — vertical movement through vessel | Particulate suspension, homogenization, low-vortex mixing |
| Centrifugal (-S2) | Radial — horizontal movement outward | Solution preparation, dissolution, surfactant mixing |
| Paddle w/flat holes (-S3) | Mixed axial + turbulent | Higher-viscosity formulation work, paste mixing |
| 4-arm (-S4, default) | High-coverage axial-radial | General-purpose workhorse — included with chassis |
Pick the one-line propeller (IPS2050-P-S1) when:
- Workflow requires particulate suspension without inducing surface vortex
- Low-to-medium viscosity samples where axial flow is sufficient
- Aqueous and mild-solvent chemistry (stainless compatible)
- The default 4-arm propeller produces too much surface disturbance for the workflow
Pick the Teflon equivalent (IPS2050-P-T1) when sample chemistry includes aggressive solvents, high-acid, or high-base formulations that would corrode stainless.
Stainless vs Teflon Material Decision
| Material | Chemistry compatibility | Notes |
| Stainless steel (this product) | Aqueous, mild solvents, neutral-pH formulations, food-grade workflows | General-purpose default; lower price point |
| Teflon (IPS2050-P-T1) | Aggressive solvents (DMSO, DMF, halogenated solvents), high-acid / high-base, oxidizing chemistries | Step up when stainless would corrode; same flow pattern, different material |
IPS2050 Stainless Propeller Family
| SKU | Geometry | Flow pattern | List price |
| IPS2050-P-S1 (this product) | One-line | Axial | $110 |
| IPS2050-P-S2 | Centrifugal impeller | Radial | $110 |
| IPS2050-P-S3 | Paddle w/flat holes | Mixed | $110 |
| IPS2050-P-S4 | 4-arm | Axial-radial | $110 (included with chassis) |
Ordering & Configuration
Pair with chassis. Confirm OS-20L (IPS2050-20 / -20-E) or OS-40L (IPS2050-40 / -40-E) chassis inventory at order — the propeller is workflow-incomplete without a chassis.
Pair with appropriate impeller geometry per workflow. Multi-investigator labs benefit from inventorying the full -S1/-S2/-S3 set ($330 total) for protocol-flexibility across particulate-suspension, solution-prep, and viscous-mixing workflows.
Confirm at quote: chassis pairing, sample-chemistry compatibility (stainless vs Teflon decision), workflow flow-pattern requirement (axial vs radial vs mixed), and lead time.
Warranty: Per Benchmark Industrial standard accessory terms — confirm at quote.
IPS2050 stainless propeller selection:
- IPS2050-P-S1 (this product) — One-line, axial flow — particulate suspension, low-vortex mixing
- IPS2050-P-S2 — Centrifugal impeller, radial flow — solution preparation
- IPS2050-P-S3 — Paddle w/flat holes, mixed flow — higher-viscosity work
- IPS2050-P-S4 — 4-arm, general-purpose (included with chassis)
Pick the one-line propeller for axial-flow particulate-suspension workflows; sister geometries cover other flow-pattern requirements; Teflon equivalents (IPS2050-P-T1/-T2/-T3/-T4) cover aggressive-chemistry compatibility.
