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Cometech QC-621A Manual Crock Meter | Color Fastness to Rubbing (Dry / Wet)
- Manual crock meter for evaluating color fastness to rubbing using controlled rubbing against a white cotton cloth.
- Abrasion head can clamp dry or wet white cloth under 900 g load; hand-driven handle for the rubbing cycles.
- Common procedure uses ~60 CPM and 10 rubbing cycles, then stain level on white cotton is graded to determine fastness.
- Designed for textile and leather applications.
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Overview
Cometech QC-621A Manual Crock Meter is used to evaluate color fastness to rubbing by rubbing a specimen against a white cotton cloth under a defined load and stroke.
After the test, the staining level on the white cotton is observed to determine the specimen’s color fastness level.
How the test works (typical)
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- Clamp the specimen on the fixed test seat.
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- Clamp/wrap dry or wet white cotton cloth on the abrasion head.
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- Rotate the handle to run the specified number of back-and-forth rubs (commonly 10 cycles).
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- Remove the cotton cloth and assess staining level to grade rubbing fastness.
Technical Specifications
| Model | QC-621A |
|---|---|
| Operation | Manual (hand-driven handle) |
| Abrasion load | 900 g |
| Abrasion distance (stroke) | 10 ± 0.7 cm |
| Test speed | Around 60 CPM |
| Counter | LCD display, with zero key |
| Rubbing cloth | White cotton |
| Dimensions (W × D × H) | 60 × 28 × 24 cm |
| Machine weight | 5.5 kg |
| Industry | Textile, Leather |
Support materials
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- Test video, teaching material, SOP, and test case (availability depends on configuration and region).