Brookfield SSA Small Sample Adapter for Rotational Viscometers

Overview

The Brookfield SSA (Small Sample Adapter) is an engineered accessory designed to extend the measurement capability of Brookfield rotational viscometers and rheometers to applications where sample volume is severely constrained. It operates on the principle of controlled Couette flow between a rotating spindle and a precisely dimensioned cylindrical sample chamber—enabling accurate, reproducible viscosity measurements under defined shear conditions using as little as 2.1 mL of material. Unlike standard concentric cylinder or cone-and-plate geometries, the SSA integrates with Brookfield’s SC4-series spindles and proprietary sample chambers (e.g., SC4-6R(P), SC4-13R(P)) to deliver calibrated shear rates across a broad viscosity range—from low-viscosity solvents to highly structured gels and pastes. Its mechanical design minimizes wall effects and thermal mass, supporting stable temperature equilibration when used with Peltier-controlled baths or environmental chambers.

Key Features

• Optimized for minimal sample consumption: accommodates volumes from 2.1 mL (SC4-14/SC4-7R(P)) to 16.1 mL (SC4-25Z/SC4-13R(P)), reducing material cost and waste in R&D, QC, and regulatory submissions.
• Interchangeable spindle-chamber pairing: supports 11 distinct SC4 spindle configurations, each delivering a unique, traceable shear rate profile (0.22–1.32 s⁻¹) at fixed rotational speeds (N rpm), enabling direct comparison across formulations.
• Direct integration with Brookfield’s full portfolio of digital viscometers and rheometers—including DVNext, DV2T, DV3T, and LV/RV/HA/HB series—without firmware modification or calibration recalibration.
• Machined from high-grade anodized aluminum and borosilicate glass components, ensuring dimensional stability, chemical resistance to common solvents, and long-term repeatability under routine laboratory use.
• Designed for rapid setup and cleaning: removable sample chambers allow solvent rinsing and drying without disassembling the adapter housing, supporting high-throughput screening protocols.

Sample Compatibility & Compliance

The SSA is validated for use with Newtonian and non-Newtonian liquids—including pharmaceutical suspensions, cosmetic emulsions, ink dispersions, polymer melts, and food colloids—where representative sampling is limited by cost, toxicity, or synthesis scale. Its geometry satisfies the geometric constraints required for compliance with ASTM D2196 (Standard Test Methods for Rheological Properties of Non-Newtonian Materials), ISO 2555 (Plastics — Determination of Apparent Viscosity), and USP (Viscosity Measurements). When operated within validated instrument-spindle-chamber combinations and paired with temperature-controlled accessories (e.g., TC-650 AP), data generated meets GLP and GMP documentation requirements, including audit-trail-ready viscosity reports compliant with FDA 21 CFR Part 11 when used with Rheo3000 or PC-based software.

Software & Data Management

When connected to Brookfield’s Rheo3000 software or legacy Emulsion software (v3.5+), the SSA automatically applies preloaded spindle-chamber-specific calibration constants, eliminating manual viscosity factor entry. The software logs real-time torque, speed, temperature, and calculated viscosity (cP or mPa·s), with export options to CSV, PDF, and XML formats for LIMS integration. All measurements include metadata tags identifying the exact spindle (e.g., SC4-28), chamber (e.g., SC4-13R(P)), and shear rate (e.g., 0.28 s⁻¹), ensuring full traceability per ISO/IEC 17025 requirements. Optional IQ/OQ documentation packages are available for regulated environments requiring instrument qualification.

Applications

• Early-stage formulation development in pharmaceuticals, where API-limited batches require viscosity profiling at multiple shear rates with ≤5 mL total usage.
• Quality control of high-value specialty coatings and adhesives, where batch-to-batch consistency must be verified without consuming production-grade material.
• Academic rheology studies of microfluidic-recovered biopolymer solutions, where sample recovery yields only 3–10 mL post-purification.
• Regulatory submission support for topical drug products, generating viscosity data aligned with USP Annex requirements for shear-thinning behavior assessment.
• Stability testing of temperature-sensitive emulsions, leveraging the SSA’s low thermal inertia to minimize drift during ramped temperature profiles (e.g., 5–40°C at 1°C/min).

FAQ

Can the SSA be used with non-Brookfield viscometers?
No—the SSA relies on Brookfield’s proprietary spindle interface, torque sensor calibration, and firmware-based shear rate calculation. It is not mechanically or electronically compatible with third-party instruments.
Is temperature control supported?
Yes—when mounted on Brookfield’s TC-650 AP Peltier-controlled bath or integrated into a circulating water bath system, the SSA maintains ±0.1°C stability over standard operating ranges (5–80°C).
How often does the SSA require recalibration?
The SSA itself is a passive mechanical adapter and does not require periodic recalibration. However, the host viscometer must undergo annual metrological verification per ISO/IEC 17025 guidelines, using NIST-traceable standards.
Does the SSA support yield stress measurement?
Not natively—the SSA operates in steady-shear mode and does not provide controlled-stress ramping or oscillatory functionality. For yield stress determination, a dedicated cone-and-plate or vane geometry on a rheometer such as the DV3T or Rheo3000 is recommended.
Are replacement chambers and spindles available separately?
Yes—SC4-series spindles and sample chambers (e.g., SC4-13R(P), SC4-7R(P)) are stocked as consumables (P/Ns available upon request) and qualify as Class I medical device accessories under FDA 21 CFR 890.1500 when used in diagnostic assay development.