Yarn Package Hardness Tester HP-2.5

Textile hardness tester (durometer) to determine winding density of closely wound bobbins of synthetic, finished fibers and filaments

Indentor - ball diameter 2.5 mm
The measuring force is according to shore A regulations

Durometer with curved working face for bobbins with diameter up to 400 mm

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-2.5

For bobbins with diameters over 400 mm use yarn package hardness tester HP-2.5-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

Available Models

ModelBall ØApplication
HP-2.52.5 mmfor closely wound bobbins of synthetic, finished fibers and filaments
HP-55 mmfor loosely wound bobbins of synthetic fibers and closely wound natural fibers, yarns and threadsmore
HP-1010 mmfor very loosely wound bobbins of thick yarns, such as carpet yarnsmore

Indentor:Ball Ø 2.5 mm
Area of application:For closely wound bobbins of synthetic, finished fibers and filaments
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)

Specifications subject to change without notice!

* Meets requirements of Shore A
** Spring load of outer ring to create constant pressure when outer ring is pulled to red marking

For measuring the hardness, the spring-loaded outer ring of the housing is pressed downwards until the edge of the ring meets the red marking on the housing. This ensures a constant pressure and prevents measuring errors.

The principle used to measure textile hardness is based on measuring the resistance force of the penetration of a ball shaped indentor against the spool under a known spring load. The hardness scale covers a range of 0 – 100, were 0 is the smallest and 100 is biggest hardness. The measuring force and the principle relates to the specifications of rubber hardness tester Shore A.

Operation with a durometer

Please note:
There exists no international standard for adjusting and calibration of textile hardness. Therefore we have developed our own test-standard and procedures.

Attachments and Accessories

  1. Memory pointer Code M

    Schleppzeiger bei einem HärteprüferMemory pointer to capture and store value (last or highest reading) during measuring.
    Order code: HP-2.5-M

  2. Test Stand

    Prüfstand PHPS für Härteprüfer

    Model PSHP for series measurements
    – Spring loaded lever for fast, precise positioning
    – Height adjustable 0 – 200 mm
    – Stroke lever action 40 mm
    – Dimensions 162 x 100 x 320 mm (LxWxH)
    – Weight net: approx. 2,3 kg
    Various plates are optional available,
    ask for more information !

  3. Test Block

    Prüfblock HP-PT für Härteprüfer mit gekrümmter Auflagefläche

    The test plate is used for testers with a curved surface. It can be tested, if the measuring pointer does a 360° turnaround conforming to an defined penetration.
    Test method:
    Place the tester on the block. Press down the instrument with its housing ( do not use spring – loaded outer shell). The pointer has to do a full turnaround from zero to zero marking. If the result of the verification is positive, the durometer should show correct readings over the complete range.

    Order number: HP-P up to serial-number 310-5800
    Order number: HP-PT from serial-number 310-5801

  4. Calibration Certificate

    Kalibrierbericht für HärteprüferCalibration certificate with calibration report is optional available.


Dimensions of durometer HP-2.5 for download:
Delivery Includes

Lieferumfang Textilhärteprüfer HP-2.5Yarn package hardness tester HP-2.5 with carrying case, Certificate of Compliance with the order 2.1 according EN 10204 free of charge, operating instructions in English or German as requested.

Instruction Manual

Download the instruction manual for yarn package hardness tester HP-2.5:

If you want to get a quote or want to place an order please contact us.

+49 (0)8638 9410-0

+49 (0)8638 4825