Shibayama SS-180 Capillary Automatic Viscometer System

Overview

The Shibayama SS-180 Capillary Automatic Viscometer System is an engineered benchtop instrument designed for precise, repeatable intrinsic and relative viscosity determination of polymer solutions using standardized Ubbelohde capillary viscometry. Based on the principle of Poiseuille flow—where fluid viscosity is derived from the time required for a fixed volume of solution to pass between two calibrated marks under gravity—the SS-180 delivers high reproducibility in compliance with ISO 1628-1 (Plastics – Determination of Viscosity Number), ASTM D1243 (Standard Test Method for Dilute Solution Viscosity of Vinyl Chloride Polymers), and USP (Viscosity). Its thermally stabilized bath architecture ensures minimal thermal drift during extended measurement sequences, making it suitable for QC laboratories performing routine polymer characterization across PVC, PET, PC, PA6, silicone rubber, and other synthetic macromolecular systems.

Key Features

• High-stability temperature control system with ±0.01 °C accuracy over the full operating range (+5 °C to 40 °C), achieved via Peltier-assisted circulation and dual-sensor feedback
• Automated sample handling sequence: syringe-driven injection, gravity-driven capillary flow timing, post-measurement ejection, and programmable solvent rinse cycle
• Ubbelohde-type capillary configuration with standardized capillary dimensions (e.g., 0.5–1.0 mm bore), compatible with ISO/ASTM-compliant viscometer tubes
• Benchtop fixed-mount design optimized for integration into ISO 17025-accredited testing environments; no external chiller or compressed air required
• Configurable measurement protocol: user-selectable run count (3–5 replicates), dwell time before flow initiation, and automatic outlier rejection based on statistical deviation thresholds
• Integrated real-time flow timing resolution down to 0.01 s, synchronized with photometric detection of meniscus passage at upper and lower calibration marks

Sample Compatibility & Compliance

The SS-180 supports aqueous and organic solvent-based polymer solutions—including chloroform, phenol/tetrachloroethane mixtures, and o-dichlorobenzene—within defined viscosity ranges appropriate for standard Ubbelohde geometry. It accommodates sample volumes of 10–25 mL per test, with compatibility verified for common polymer concentration protocols (e.g., 0.5 g/dL for PET, 0.25 g/dL for PVC). All operational parameters—including temperature setpoint, timing logic, cleaning solvent selection, and data export format—are configurable to align with GLP and GMP documentation requirements. The system supports audit trail generation for critical parameters per FDA 21 CFR Part 11 when paired with validated third-party LIMS or ELN software.

Software & Data Management

The SS-180 operates via embedded firmware with USB and RS-232 connectivity for host PC communication. The accompanying Shibayama ViscoControl Suite (v3.2+) enables method creation, batch processing, raw timing data export (CSV/TXT), and automated calculation of inherent viscosity [η], reduced viscosity η_sp/c, and intrinsic viscosity extrapolated via Huggins or Kraemer plots. All calculations follow ISO 1628-1 Annex B methodology. Data files include timestamped metadata (operator ID, ambient conditions, capillary ID, calibration constants), supporting traceability in regulated environments. Export formats comply with ASTM E1382 for analytical instrument data interchange.

Applications

• Routine quality control of polymer raw materials and finished resins in manufacturing facilities
• In-process monitoring of polymerization reaction progress via sequential viscosity sampling
• Stability assessment of polymer solutions under accelerated aging protocols
• Comparative molecular weight estimation for batch-to-batch consistency verification
• Supporting regulatory submissions requiring ISO/ASTM-compliant viscosity data (e.g., medical device polymer certifications, automotive material specifications)
• Academic research in polymer physics where precise dilute-solution rheology is foundational

FAQ

What capillary types are supported by the SS-180?
The system is configured for standard Ubbelohde capillaries conforming to ISO 3105 and ASTM D445 dimensional tolerances; interchangeable capillaries with nominal efflux times of 100–300 s are recommended for optimal precision.
Is the SS-180 compliant with 21 CFR Part 11?
The instrument itself does not include electronic signature capability; however, its data export architecture and deterministic timing engine support integration with Part 11–validated software platforms for electronic records and signatures.
Can the SS-180 operate unattended overnight?
Yes—when loaded with sufficient solvent and waste capacity, and configured with scheduled start times and auto-shutdown, the system supports unattended multi-sample batches with full error logging and alarm notification via serial output.
What maintenance is required for long-term accuracy?
Capillary cleaning validation every 20–30 runs, annual calibration of temperature sensors against NIST-traceable references, and periodic verification of photometric detection sensitivity using certified reference fluids (e.g., Cannon-Fenske standards).