Rotary Crockmeter for Rub (Crocking) Fastness Testing
A Rotary Crockmeter is a laboratory instrument used to test the colour fastness of fabric to rubbing, commonly known as crocking. Unlike a standard linear crockmeter that moves a test finger back and forth in a straight line, a rotary crockmeter moves the finger in a circular path, allowing dry and wet rubbing tests to be carried out on the same fabric area with controlled, repeatable motion.
Textile testing laboratories use the Rotary Crockmeter to check whether dye rubs off a fabric onto another surface during handling, wear, or washing. This is a routine test in colour fastness evaluation under ISO 105-X12 and AATCC 8/165 methods, and results are typically rated using a grey scale for staining.
Garment manufacturers, textile mills, apparel export houses, quality control labs, and university textile departments rely on this instrument to confirm that fabrics meet buyer rub fastness requirements before bulk production or shipment. A properly calibrated rotary crockmeter delivers consistent pressure and motion, reducing variation between operators and test runs.
Amith Garment Services supplies genuine, standard-compliant Rotary Crockmeters backed by over 25 years of experience serving Indian textile testing laboratories, along with calibration and after-sales support.
Purpose
To find out ‘colour fastness to rubbing’ of any kind of printed fabric/garment- both dry and wet rub.
Features
- This instrument is used for testing the dry/ wet rubbing fastness of fabrics especially for printing fabrics.
- Rotary crock meter rugged base construction and designed as a table top model.
- Rotating handle in top side to make a test create a friction in the sample.
- Weights provided to load the sample a certain pressure.
- Compare the crocking cloth in grey scale for staining.
- Compare the sample fabric in grey scale for color change.
Related Standards
- AATCC 116
Contact Amith Garment Services for pricing and technical details.
Frequently Asked Questions:
What is a Rotary Crockmeter used for?
A Rotary Crockmeter is used to measure colour fastness to rubbing by determining how much dye transfers from a fabric onto a standard white test cloth under dry or wet conditions. It is widely used in textile laboratories following ISO 105-X12 and AATCC 8/165 standards to evaluate rub fastness.
What is the difference between a Rotary Crockmeter and a Linear Crockmeter?
A Linear Crockmeter moves the rubbing finger back and forth in a straight line, while a Rotary Crockmeter performs the rubbing action in a circular motion. The rotary design provides consistent rubbing on a fixed area of the fabric and is required for specific international standards and buyer testing specifications.
Which standards apply to Rotary Crockmeter testing?
Rotary Crockmeter testing is commonly performed according to ISO 105-X12, AATCC Test Method 8, and AATCC Test Method 165. These standards define the rubbing motion, applied pressure, rubbing finger dimensions, and evaluation procedures to ensure accurate and repeatable colour fastness results.
What is a Rotary Crockmeter?
A Rotary Crockmeter is a laboratory instrument used to assess a fabric's colour fastness to rubbing. It rubs the test specimen against a standard white cloth in a circular motion to determine the amount of colour transferred during friction.
How does a Rotary Crockmeter test colour fastness?
The instrument uses a weighted rubbing finger wrapped with a standard white test cloth and moves it over the fabric sample in a controlled circular path under dry or wet conditions. After testing, the stained cloth is compared with a Grey Scale to determine the colour fastness rating.
Why should laboratories use a calibrated Rotary Crockmeter?
A calibrated Rotary Crockmeter ensures consistent pressure, movement, and repeatable testing conditions, delivering accurate colour fastness results. Proper calibration helps laboratories comply with ISO and AATCC standards while reducing the risk of inconsistent results, buyer disputes, or failed quality audits.