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Cometech QC-621N Electronic Crock Meter | Color Fastness to Rubbing (Dry / Wet)
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Cometech QC-621N Electronic Crock Meter | Color Fastness to Rubbing (Dry / Wet)

  • Electronic crock meter for evaluating color fastness to rubbing using controlled back-and-forth rubbing against a white cotton cloth.
  • Standard setup uses 5 × 5 cm white cloth on the rubbing head, 16 mm rubbing head, 900 g load, and 10 cm rubbing distance.
  • Automatic test run and counter with reset; after rubbing, grade staining using a gray scale.
  • Supports dry and wet rubbing workflows for textiles and leather.
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Overview

Cometech QC-621N Electronic Crock Meter is used to evaluate color fastness to rubbing by rubbing a specimen under a defined load and stroke against a white cotton cloth. The machine runs a controlled rubbing action and stops at the preset count, then the staining level on the white cloth is assessed using a gray scale to determine the color fastness grade.

Technical Specifications

Standards

  • JIS L0849
  • ISO 105
  • AATCC 8
  • JIS L0862
  • GB/T 420
  • GB/T 3920-2008

Test method (typical)

  1. Clamp the specimen on the fixed test seat.
  2. Wrap a 5 × 5 cm white cotton cloth on the rubbing head.
  3. Run the rubbing test at the specified stroke and speed for the required cycles (commonly 10 cycles).
  4. Remove the white cloth and grade staining using a gray scale to determine the rubbing fastness level.

Core specifications

Model QC-621N
Abrasion load 9 N (900 g)
Abrasion head diameter 16 mm (round); 19 × 25.4 mm (square)
Abrasion distance 10 ± 0.7 cm
Counter Electronic display with zero reset
Test speed 60 ± 3 RPM
Power 220V / 2A
Machine size (W × D × H) 76 × 30 × 28 cm
Machine weight 16 kg

Included accessories

  • White cotton cloth
  • Sandpaper #600 (helps prevent specimen slipping)

Related products

  • QC-621A Manual Crock Meter
  • QC-622H Surface Hardness Abrasion Tester
  • QC-319 Dyeing Rubbing Tester

Support materials

  • Test video, teaching material, SOP, and test case (availability depends on configuration and region).