Erichsen #494 Washability and Scrub Resistance Tester
| Origin | Germany |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | #494 |
| Price | Upon Request |
Overview
The Erichsen #494 Washability and Scrub Resistance Tester is a precision-engineered tribological testing instrument designed for standardized evaluation of coating durability under mechanical cleaning stress. It operates on the fundamental principle of controlled linear reciprocating motion to simulate real-world scrubbing or washing actions—enabling quantitative assessment of both washability (soil removal efficiency) and scrub resistance (coating integrity retention). The system complies with three major international standards: DIN 53778 (for plastic dispersions), ASTM D2486 (for architectural coatings), and ISO 11998 (for interior wall paints). Its modular architecture allows seamless configuration for each standard via interchangeable accessories, ensuring method-specific repeatability and traceable compliance in QC laboratories, R&D facilities, and regulatory submission environments.
Key Features
- Motor-driven linear reciprocating mechanism with eccentric cam and wire transmission, delivering precise stroke control over (300 ± 5) mm
- Digital preset counter for accurate cycle registration—each count representing one full forward-and-backward motion
- Adjustable scrub frequency of (37 ± 1) cycles per minute, stabilized by synchronous motor control
- Integrated leveling feet and built-in spirit level ensure consistent sample alignment and load distribution
- Stainless steel trough with overflow port prevents fluid accumulation and supports uniform wetting conditions
- Modular accessory interface enabling rapid reconfiguration between DIN, ASTM, and ISO test modes
- Compact footprint (600 × 400 × 360 mm) and lightweight design (~15 kg) facilitate integration into constrained lab spaces
Sample Compatibility & Compliance
The #494 accommodates standard substrate formats including Leneta-compatible PVC test panels (430 × 165 mm and 430 × 280 mm), black plastic sheets, and glass plates. All test configurations maintain strict adherence to the geometric and loading requirements defined in DIN 53778, ASTM D2486, and ISO 11998. For DIN mode, a calibrated pig bristle brush applies 135 g nominal load via rubber pad and fixed holder; ASTM mode employs a nylon brush with a 0.25 mm-thick, 12.7 mm-wide metal spacer to define failure initiation point; ISO mode utilizes a weighted abradant pad (135 g) driven across the surface for 200 cycles. Optional soiling devices (e.g., Erichsen 444-type soil applicator) enable reproducible contamination prior to testing—critical for GLP-compliant studies requiring documented baseline soiling.
Software & Data Management
While the base #494 operates as a stand-alone electromechanical tester without embedded software, its digital cycle counter provides auditable, tamper-resistant run logs suitable for manual entry into LIMS or electronic lab notebooks. When integrated with external data acquisition systems (e.g., via RS-232 or optional analog output modules), cycle count, runtime, and motor status can be timestamped and archived in accordance with FDA 21 CFR Part 11 requirements. All accessories—including brushes, spacers, and mounting fixtures—are assigned unique Erichsen part numbers (e.g., 0068.01.32, 0087.01.32) to support full traceability during instrument qualification (IQ/OQ/PQ) and internal audit preparation.
Applications
This tester serves core functions across paint formulation, quality assurance, and regulatory compliance workflows. It is routinely deployed to validate performance claims for interior emulsion paints, industrial coatings, and architectural finishes—particularly where resistance to repeated cleaning or exposure to abrasive detergents is specified. In R&D labs, it supports comparative screening of binder systems, pigment dispersion stability, and additive efficacy (e.g., scrub resistance enhancers). In manufacturing QA, it verifies batch-to-batch consistency against internal specifications aligned with ISO 9001 and IATF 16949 process control protocols. Its compatibility with multiple standards also enables cross-laboratory correlation studies required for global product registrations.
FAQ
Does the #494 comply with FDA or pharmaceutical coating testing standards?
No—this instrument is not validated for USP or other pharmaceutical film-coating abrasion tests. It is purpose-built for architectural and industrial coatings per DIN/ASTM/ISO.
Can the scrub frequency be adjusted beyond the nominal 37 cpm?
The unit is factory-calibrated to (37 ± 1) cpm per standard requirements; no user-adjustable frequency setting is provided to preserve method fidelity.
Is the micro-dosing pump (Order No. 0087.01.32) compatible with all liquid cleaners?
Yes—the pump delivers consistent volumetric flow for aqueous and low-viscosity solvent-based scrub solutions, but aggressive solvents require verification of chemical compatibility with pump tubing materials.
What electrical options are available besides 230 VAC?
A 115 VAC version is available upon request; both variants include CE marking and meet IEC 61000-6-2/6-4 EMC requirements.
How is calibration verified for routine use?
Calibration is performed using certified stroke length gauges and tachometers during annual service; users conduct daily visual checks of brush alignment, clamp tightness, and counter functionality as part of equipment logbook entries.
