Crock Meter – Digital & Rotary Colour Fastness to Rubbing Tester
If a fabric looks perfect on the roll but leaves colour on your hands the moment it’s rubbed, that shipment isn’t going anywhere. This is exactly the failure a Crock Meter is built to catch before a buyer does.
At Amith Garment Services, we’ve supplied Crock Meters to textile mills, garment exporters, and testing laboratories across India since 1999. This page walks through what the instrument actually does, how it works, and what to look for before you buy one.
What is a Crock Meter?
A Crock Meter is a laboratory instrument used to measure colour fastness to rubbing — how well a dyed or printed fabric holds its colour when rubbed against another surface, under either dry or wet conditions.
It’s one of the most frequently requested tests in garment and fabric export documentation, because a fabric that “crocks” (transfers colour through rubbing) can stain skin, upholstery, or other garments during normal use.
Why Colour Fastness Testing Matters
Buyers don’t just want fabric that looks good on delivery. They want fabric that stays that way through wear, washing, and handling. Rub fastness failure is one of the more common reasons for shipment rejection at the pre-shipment inspection stage.
A few reasons this test carries so much weight:
- It’s a standard requirement in almost every buyer’s technical specification sheet
- Poor rub fastness affects both dry-cleaning and everyday wear performance
- It’s a fast, low-cost test that catches a defect before it becomes a costly return
- Export documentation for the US and EU markets typically asks for AATCC or ISO rub fastness results specifically
In short, colour fastness testing isn’t a formality — it’s one of the checkpoints standing between your fabric and a rejected container.
How a Crock Meter Works
The test itself is straightforward, which is part of why it’s so widely used in quality control labs.
A dry, undyed cotton test cloth is mounted onto a finger of standard size and weight. This finger rubs against the fabric sample under a fixed pressure, for a set number of strokes, in a set direction. The test cloth is then compared against a grey scale to rate how much colour transferred.
The same test is repeated with a wet test cloth to measure wet rub fastness, which is typically harder for a fabric to pass than dry rub fastness.
Working Principle
- The test specimen is placed flat and held in position on the testing base
- A rubbing finger — 16 mm diameter for apparel fabric, 25 mm for furnishing fabric — moves back and forth (or rotates, in rotary models) under a fixed load, commonly around 9N or with an optional 22N dead weight
- The finger carries a piece of standard white cotton test cloth
- After a specified number of rub cycles, the test cloth is examined and rated against a grey scale for staining
- Results are reported as a grade from 1 (poor) to 5 (excellent)
Types of Crock Meter
Manual Crock Meter Hand-operated, with the tester performing the rub cycles by hand crank. Economical and still widely used in smaller labs.
Digital / Motorised Crock Meter Rotation is driven by an electric motor, which removes the variation that comes from manual operator technique. This is the version we supply most often, since consistent stroke speed and pressure directly affect test repeatability.
Rotary Crock Meter Uses a rotating, rather than reciprocating, rubbing action and is generally preferred for testing printed fabrics, where the pattern can affect how colour transfers under a linear rub motion.
Applications
- Colour fastness to dry and wet rubbing on woven and knitted fabric
- Rub fastness testing on yarn (dyed, even yarns)
- Pre-shipment quality checks before garment export
- Routine in-process testing during dyeing and finishing
- Teaching demonstrations in textile technology programs
Industries Using Crock Meter
- Garment export houses and manufacturing units
- Fabric and textile mills
- Apparel buying houses and third-party inspection agencies
- Independent and accredited textile testing laboratories
- Universities and textile research institutes
- In-house QC departments at fashion and home textile brands
Key Features
- Motorised operation to remove manual rubbing inconsistency
- Mild steel construction with chrome plating for long-term durability
- Interchangeable finger sizes — 16 mm for apparel, 25 mm for furnishing fabric
- Compatible with ISO and AATCC test procedures on the same unit
- Optional 22N dead weight attachment for methods requiring added load
- Compact bench footprint suited to space-constrained labs
Technical Specifications
| Parameter | Specification |
| Test Type | Colour fastness to rubbing (dry & wet crocking) |
| Operation | Motorised (digital) / manual, depending on model |
| Standard Finger Diameter | 16 mm (apparel), 25 mm (furnishing) |
| Standard Load | Approx. 9N base; optional 22N dead weight attachment |
| Construction | Mild steel body, chrome-plated components |
| Applicable Standards | ISO 105-X12, AATCC 8, AATCC 165 |
| Grey Scale | Purchased separately per ISO/AATCC method |
| Power Supply | 220V, single phase (digital models) |
| Suitable Materials | Woven fabric, knitted fabric, yarn, garments |
| Certification Supplied | Calibration certificate with traceability |
Note: exact specifications vary slightly by model — confirm the configuration you need when requesting a quote.
Benefits
- Faster, more consistent test cycles than manual crocking
- Reduces the risk of pre-shipment rejection over rub fastness failure
- Simple enough for routine QC staff to operate after brief training
- Supports both apparel and home furnishing fabric testing on one unit
- Backed by calibration certification for audit and buyer verification purposes
Testing Standards Supported
Amith Garment Services’ Crock Meters are built to test in line with:
- ISO 105-X12 — Colour fastness to rubbing (international standard)
- AATCC 8 — Colour fastness to crocking, standard crockmeter method
- AATCC 165 — Colour fastness to crocking, textile floor coverings
These are the exact standards referenced in most buyer technical packs and export compliance documents.
Why Choose Amith Garment Services
We’ve been supplying and servicing textile testing equipment out of Bangalore since 1999, and Crock Meters have been part of that catalogue from the beginning. A few reasons labs across India work with us:
- Technical support from a team that understands textile test methods, not just equipment specs
- Installation and demonstration included with every unit
- Calibration assistance, with a complimentary one-year calibration warranty
- Fast delivery across Bangalore, Tiruppur, Coimbatore, Erode, Surat, Ludhiana, Delhi, Noida, Panipat, and other textile hubs across India
- Affordable pricing without cutting corners on build quality
- Expert guidance on choosing the right model for your test volume and standard
- After-sales support, including repair and recalibration when instruments go out of spec
Maintenance Tips
- Wipe down the rubbing finger and base plate after each test session to prevent dye residue buildup
- Check finger alignment periodically — misalignment affects rub pressure and skews results
- Store grey scales away from direct sunlight, as UV exposure fades the reference chips over time
- Get the instrument recalibrated annually, or sooner if results start looking inconsistent
- Keep moving parts lightly lubricated per the manufacturer’s manual to avoid motor strain
Buying Guide
Before you buy a Crock Meter, it helps to be clear on:
- Test volume — a manual unit may be fine for occasional testing; a motorised model pays for itself quickly in a high-throughput lab
- Fabric type — apparel-focused labs need the 16 mm finger; furnishing and upholstery labs need 25 mm
- Standard required — confirm whether your buyer wants ISO 105-X12, AATCC 8, AATCC 165, or a combination
- Printed vs woven fabric — rotary models tend to handle printed fabric more consistently
- Calibration support — check whether calibration certification and after-sales servicing are included, not just the machine price
Conclusion
A Crock Meter is a small instrument with an outsized impact on whether a shipment clears inspection. Whether you’re running a single manual unit in a small QC corner or fitting out a full accredited lab, getting the right configuration — and a supplier who’ll stand behind it with calibration and service — matters more than the sticker price.
Frequently Asked Questions
Find answers to common questions about Crock Meter Testing Equipment.
A Crock Meter is used to test colour fastness to rubbing on fabric, yarn, and garments. It measures how much dye transfers onto a white test cloth when rubbed against the sample under dry or wet conditions, helping textile laboratories and manufacturers verify whether a fabric meets buyer specifications and export quality requirements.
Dry crocking evaluates colour transfer using a completely dry rubbing cloth, while wet crocking uses a cloth moistened to the specified moisture level. Wet crocking is generally more demanding because moisture loosens dye particles more easily, often producing lower colour fastness ratings than dry testing.
Crock Meter testing commonly follows internationally accepted standards such as ISO 105-X12 for rubbing fastness, AATCC 8 for textile materials, and AATCC 165 for textile floor coverings. The applicable standard depends on the buyer's testing requirements and product specifications.
A manual Crock Meter is operated by hand and depends on the operator to maintain a consistent rubbing speed. A digital or motorised Crock Meter uses an electric motor to control stroke count and rubbing speed automatically, delivering more accurate, repeatable, and consistent test results for high-volume laboratory testing.
The ideal Crock Meter depends on your testing volume and application. Motorised digital Crock Meters are recommended for laboratories requiring high accuracy and frequent testing, while rotary Crock Meters are ideal for printed fabrics. Manual models are a cost-effective choice for smaller laboratories or occasional quality control testing.
A Crock Meter rubs a standard white test cloth against a fabric specimen using a controlled pressure and fixed number of strokes under either dry or wet conditions. The staining transferred onto the white cloth is then compared with a standard grey scale to assign a colour fastness rating from 1 to 5.
Crock Meters are widely used in textile mills, garment manufacturing units, apparel export houses, third-party textile testing laboratories, university textile departments, research institutes, and in-house quality control laboratories to verify rubbing fastness before production approval or shipment.