Yarn Package Hardness Tester

The Yarn Package Hardness Tester is a precision instrument designed to measure the hardness of yarn packages and bobbins with exceptional accuracy. Featuring a spring-loaded outer ring, it ensures constant measuring pressure and eliminates operator-based inconsistencies. The ball-shaped indentor prevents bobbin damage, while the curved working face (55 mm radius) fits small bobbins perfectly. With a 0–100 hardness scale and easy-to-read display, this tester delivers consistent, repeatable results across various yarn types. Ideal for both synthetic and natural fiber bobbins, it provides reliable performance for quality control in textile manufacturing and laboratory applications.

Special Features

• The spring-loaded outer ring assures a constant measuring pressure and eliminates false readings due to difference between operators
• Ball shaped indentor prevents damage to bobbins
• Working face slightly curved to fit on small bobbins, working face radius 55 mm
• Adjustable Min./Max. indicator marks to highlight working range of the yarn package hardness tester HP-5
• For bobbins with diameters over 400 mm use yarn package hardness tester HP-5-F with flat working face e.g. warping beams
• Optionally available: Calibration certificate with calibration report

Standard Features

• High repeatability
• Easy to use
• Display range 0 – 100 hardness graduation marks
• Certificate of Compliance with the order 2.1 according EN 10204 is included

Specifications

• Indentor: Ball Ø 5 mm
• Area of application: For loosely wound bobbins of synthetic fibers and closely wound natural fibers, yarns and threads
• Depth of indentation*: 0 – 2.5 mm
• Test pressure**: Approx. 12.5 N
• Measuring spring force*: 0.55 – 8.065 N
• Display range: 0 – 100 hardness graduation marks
• Scale diameter: 54 mm
• Working face radius: 55 mm
• Weight, net (gross): Approx. 300 g (500 g)
• Dimensions: 50 x 58 x 110 mm (LxWxH)

Why Choose Yarn Package Hardness Tester

Choose the Yarn Package Hardness Tester for its accuracy, repeatability, and operator-independent performance. Its spring-loaded measuring system ensures consistent pressure during testing, minimizing human error and providing dependable hardness readings. The ball-shaped indentor and ergonomic curved face safeguard bobbins while maintaining high sensitivity for both loosely and tightly wound yarns. With a wide measurement range (0–100 hardness marks) and optional calibration certificate, this tester meets professional standards for textile production and research. Lightweight yet durable, it is easy to operate and ideal for use in quality control labs, yarn mills, and textile testing facilities. Designed for precision and reliability, it helps manufacturers maintain uniform yarn density and optimize production consistency.