Brabender C-Type Carbon Black Absorption Meter (Oil Absorption Tester)

Overview

The Brabender C-Type Carbon Black Absorption Meter is a precision-engineered instrument designed specifically for the quantitative determination of oil absorption number (OAN) of carbon black—defined as the volume of dibutyl phthalate (DBP) or paraffin oil absorbed per 100 g of carbon black under standardized shear conditions. Based on the fundamental principle of torque rheometry, the system monitors real-time torque response during controlled oil addition to a dry carbon black sample in a temperature-stabilized mixing chamber. As oil is incrementally dosed, the material transitions through three distinct rheological phases: free-flowing (low torque), agglomerate formation (rising torque plateau), and final fluidization (torque decline). The OAN is determined at the inflection point corresponding to 70% of maximum torque—per ASTM D3493 Method C—or at the peak torque (ASTM D2414 Method A/B), enabling direct correlation with compound processability, dispersion quality, and vulcanizate reinforcement efficiency in rubber formulations.

Key Features

• Exclusive compliance with ASTM D2414 (Methods A, B) and ASTM D3493 (Methods A, B, C), including automated identification of the 70% maximum torque endpoint required by Method C
• High-resolution digital torque transducer (0–10 N·m range, ±0.5% full-scale accuracy) integrated with quartz-stabilized speed feedback for exceptional repeatability (<±1.5% RSD across replicate runs)
• Programmable variable-speed AC inverter drive (5–150 rpm; factory-default 125 rpm per ASTM), enabling precise shear history control during absorption kinetics
• Motorized titration unit with ±0.05 mL volumetric accuracy and software-adjustable delivery rate (default 4 mL/min, adjustable from 1–10 mL/min)
• 100 mL stainless-steel mixing chamber fitted with Brabender’s proprietary dual-blade impeller geometry for uniform shear distribution and minimal wall adhesion
• Optional thermostatic jacket (–10°C to +80°C) for studying temperature-dependent absorption behavior and simulating processing thermal profiles
• Modular design supporting rapid interchange of mixing chambers—enabling dedicated calibration, cross-contamination avoidance, and high-throughput lab workflows

Sample Compatibility & Compliance

The C-Type Absorption Meter accommodates standard carbon black grades (N110–N990 series), furnace blacks, channel blacks, and specialty conductive carbons. Sample mass is maintained at 5.00 ± 0.05 g per test—aligned with ASTM procedural requirements. All hardware and firmware comply with EU CE directives and electromagnetic compatibility (EMC) standards EN 61326-1. Data acquisition and reporting meet GLP audit trail requirements: timestamped raw torque curves, user ID logging, parameter change history, and electronic signature support are embedded in the software architecture. Full traceability to NIST-traceable torque and volumetric standards is achievable via optional calibration kits (certified reference oils and calibrated torque weights).

Software & Data Management

The 32-bit Windows-compatible software (compatible with Windows 98 through Windows 10 LTSB) provides complete instrument orchestration: synchronized motor control, titration sequencing, real-time torque curve visualization, and ASTM-conformant endpoint calculation. It implements polynomial curve-fitting algorithms to precisely locate critical transition points—eliminating operator subjectivity in manual tangent analysis. All experimental parameters—including speed profile, titration rate, temperature setpoint (if jacketed), and endpoint criteria—are stored with each dataset. Raw torque vs. time/oil volume files (.DAT) and summary reports (.PDF/.XLSX) are automatically archived with metadata (operator, date, instrument ID, calibration status). Audit-ready export supports FDA 21 CFR Part 11 compliance when deployed with validated Windows OS configurations and domain-authenticated user accounts.

Applications

• Quality control of incoming carbon black batches against supplier specifications and internal OAN tolerances
• Correlation studies between OAN and Mooney viscosity, scorch time, tensile strength, and abrasion resistance in compounded elastomers
• R&D screening of surface-modified or oxidized carbon blacks for improved dispersibility in aqueous or polar polymer systems
• Process optimization of masterbatch production—linking OAN to extruder energy consumption and dispersion homogeneity (measured via image analysis or bound rubber assays)
• Regulatory documentation for ISO/TS 16949 and IATF 16949 automotive rubber component certifications
• Interlaboratory round-robin testing programs requiring inter-site reproducibility per ISO 5725-2

FAQ

What ASTM standards does the C-Type Absorption Meter fully support?
It natively executes ASTM D2414 (Methods A and B) and ASTM D3493 (Methods A, B, and C), including automatic detection of the 70% maximum torque point mandated by Method C.
Can the instrument operate without PC connectivity?
Yes—the front-panel interface allows standalone operation with preloaded default methods, though full data analysis, curve fitting, and report generation require the Windows software.
Is calibration traceable to national standards?
Torque calibration uses certified dead-weight kits; titration accuracy is verified using Class A volumetric glassware and gravimetric checks per ISO 8655-6.
How many mixing chambers can be used interchangeably?
The system supports unlimited chamber swaps; each chamber is individually identified and calibrated in software to maintain measurement integrity across units.
Does the software support multi-language UI or only English?
The native interface is English-only; however, all report templates and data fields accept Unicode input for localized annotations and customer-specific metadata.