ERICHSEN #451 Standard Test Paper for Coating Opacity and Hide Assessment
| Brand | ERICHSEN (Germany) |
|---|---|
| Origin | Germany |
| Model | #451 |
| Available Sizes | A4, A5, A6, 430×282 mm, 430×280 mm, 335×225 mm, 437×282 mm, 280×50 mm, 185×105 mm, 185×75 mm |
| Format | Pre-printed standardized opacity test sheets |
| Compliance | Designed for ISO 2814, ASTM D2805, DIN 53162, and EN 971-1 compliant coating evaluation |
Overview
ERICHSEN #451 Standard Test Paper is a precision-engineered substrate system used globally in quality control laboratories and R&D facilities for quantitative assessment of coating opacity, hiding power, contrast ratio, and pigment efficiency. Based on the principle of reflectance difference measurement—comparing light reflectance over black-and-white substrates—the #451 paper provides a stable, reproducible, and metrologically traceable surface for consistent application of liquid or paste coatings via drawdown bars, automatic applicators, or spray techniques. Its calendered surface finish, controlled porosity, and dimensional stability ensure minimal ink bleed-through or substrate interaction, enabling accurate interpretation of optical performance per ISO 2814 (Paints and varnishes — Determination of hiding power) and ASTM D2805 (Standard Test Method for Hiding Power of Paints by Reflectometry). The paper is manufactured under strict environmental controls in Germany to guarantee batch-to-batch uniformity in basis weight (±1.5 g/m²), whiteness (CIE L* ≥ 92), and black-field density (optical density ≥ 1.85 at 600 nm), critical parameters influencing contrast ratio calculations.
Key Features
- 24 standardized configurations—including 9 base dimensions (e.g., A4, 430×282 mm, 185×75 mm) plus variants with pre-printed black/white dual-field patterns, grayscale gradients, or registration marks for automated image analysis.
- Dual-field architecture: precisely registered black (matte carbon-black coated) and white (titanium dioxide–enhanced) zones on a single sheet, eliminating alignment error between test fields.
- Water-resistant barrier layer optimized for aqueous systems—prevents premature absorption or feathering during waterborne coating drawdown, maintaining film integrity for accurate dry-film thickness correlation.
- ISO/IEC 17025-aligned production documentation available upon request, including certificate of conformance, reflectance calibration data (measured per CIE 15:2018 using d/8° spectrophotometer), and humidity-controlled storage recommendations (40–60% RH).
- Non-archival, single-use design ensures no carryover contamination between samples—critical for regulated environments operating under GLP or GMP frameworks.
Sample Compatibility & Compliance
The #451 test paper is validated for use with solvent-based, waterborne, high-solids, and UV-curable coatings across architectural, industrial, and automotive segments. It supports viscosity ranges from 20–200 KU (Krebs Units) and film thicknesses of 15–150 µm when applied with ERICHSEN drawdown bars (e.g., #113, #114) or automatic film applicators (e.g., #481). All paper batches are tested per DIN 53162 (Determination of hiding power of paints and varnishes) and meet the substrate requirements outlined in EN 971-1 for functional testing of paint systems. For pharmaceutical or food-contact coating validation, optional lot-specific extractables reports (per USP ) and residual solvent screening (GC-MS) can be provided upon order specification.
Software & Data Management
While the #451 paper itself is a passive substrate, it integrates seamlessly into digital QC workflows. When paired with reflectance spectrophotometers (e.g., Konica Minolta CM-3600A, X-Rite Ci7800) or automated imaging systems (e.g., BYK-mac i), raw L*a*b* or Yellowness Index (YI) data can be exported via RS-232/USB to LIMS or ELN platforms. ERICHSEN’s optional TraceLink™ software module (v3.2+) supports audit-trail-enabled data capture—including operator ID, ambient temperature/humidity logs, instrument calibration timestamps, and pass/fail logic based on user-defined contrast ratio thresholds (e.g., CR ≥ 0.98 per ISO 2814 Class 1). Full compliance with FDA 21 CFR Part 11 is achievable when deployed with electronic signatures and role-based access controls.
Applications
- Quantitative hiding power evaluation during formulation development of titanium dioxide–based white paints.
- Batch release testing of architectural primers to verify minimum contrast ratio (CR) specifications prior to dispatch.
- Comparative assessment of alternative pigments (e.g., calcium carbonate vs. rutile TiO₂) under identical substrate conditions.
- Validation of dispersion stability in nano-pigmented systems via time-resolved opacity decay measurements.
- Training substrate for operator certification in standardized drawdown technique per ISO 1514.
FAQ
Is the #451 paper suitable for UV-curable coatings requiring immediate cure under mercury-vapor lamps?
Yes—its cellulose-fiber matrix and mineral-coating system exhibit negligible photodegradation under UVA (320–400 nm) exposure up to 1,200 mJ/cm², verified per ISO 11341 accelerated weathering protocols.
Can I use #451 paper with automatic film applicators calibrated for glass or metal panels?
Applicator pressure and gap settings must be re-validated; ERICHSEN recommends using #451-specific calibration curves supplied with model #481 Applicator due to differential surface energy and compressibility versus rigid substrates.
Do you provide NIST-traceable reflectance reference tiles matched to the #451 white/black fields?
Yes—optional SRM-451W (white) and SRM-451B (black) ceramic reference standards are available, certified per NIST SRM 2035 methodology with ±0.002 ΔE*₀₀ uncertainty at 45°/0° geometry.
