Catalogues - testing-of-plastics-and-rubber

Catalogue Testing of plastics and rubber

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Zw/ck / Roell

Sample preparation

Injection moulding and compression moulding

To characterize thermoplastic and thermosetting materials, specimens are made by injection or direct compression moulding. The applied processing parameters such as pressure, temperature and shear-rate strongly influence the materials behavior.

Thermosetting materials:

• Compression moulding (ISO 295)

• Injection moulding (ISO 10724-1)

Thermoplastic materials:

• Compression moulding (ISO 293)

• Injection moulding (ISO 294, part

1-4)

Multipurpose specimen, ISO 3167

The local shear-rate during processing is influenced by the shape of the specimen. This means that the results of specimens with different shapes are not normally coherent.

compression, flexure, creep, hardness and impact.

Machining

For testing semi-products and finished parts, it is generally required to know the materials characteristics in the state after having achieved its final shape. The specimens are then machined in accordance to ISO 2818 or other material-specific standards.

Specimens made of softer materials showing a hardness of less than 85 Shore A, in particular rubber, elastomers and soft plastics, as well as specimens made of thin sheetings and film are manufactured relatively simple with cutting industrial presses and special dicing tools. A greater hardness leads to an increased wear of the cutting dies.

In particular greater specimen thicknesses cannot be cut if the material is harder. These materials are machined by milling, sawing, planeing or blanking.

Zwick cutting presses and tools

Knee-lever cutting press ZCP020 for all specimen shapes

For this reason a multipurpose specimen has been fixed in ISO 3167, which is to be used for a variety of different tests as for example tensile,

Cutting presses

Zwick offers a wide range of standardized cutting devices for standardized and special specimen shapes. A listing of the most used types is shown in the following tables.


Reference	H04.7101¹⁾	ZCP020	H02.7108
Application	circular specim.	all shapes	all shapes
Max. applicable load, kN	5	20	35
Push rod stroke, mm	25	41	30
Max. distance push rod-table, mm	65	155	70
Adjustment of push rod stroke, mm	12	25	-
Adjustment of table elevation, mm	-	-	70
Projection, mm	46	125	110
Anvil table, mm	swiveling	250 x 250	350 x 215
Pneumatics supply, bar	-	-	6
Net weight, kg	40	55	75
¹⁾ Cutting dies can be used for
• ring-shaped specimen up to a diameter of 80 mm,
• square-shaped specimen up to 75 mm and
• rectangular and dumbbell shaped specimens up to a size of 160 x 30 mm

Pneumatic cutting press 7108 for all specimen shapes