Inspections

Compounds

In order to ensure a high processing safety, each compound is inspected before leaving our plant. One of the most important inspections for uncured compounds is curemetry for which Phoenix uses Monsanto rheometer in accordance with DIN 53529 part 3.

The rheometer measures a compound's curing properties using a rotational thrust system without rotors. During this process the test chamber's lower half oscillates and the measured reaction torque can be displayed on a monitor or diagrammed. The measurement identifies a rubber compound's viscosity, scorch performance, cure speed and optimum cure.

Curemetry inspection is standard at Phoenix and an important part of the approval process for each compound batch.

For inspections requireing a vulcanizate we create standard test pieces in accordance with DIN, EN or ASTM regulations.

Method measurand corresponding DIN standard
Shore hardness Sh. A DIN 53505 A
Density g/cm³ DIN 53479
Tensile strength N/mm² DIN 53504
Elongation at break % DIN 53504
Tear strength N/mm DIN 53507 A
Abrasion mm³ DIN 53516
Compression set % DIN 53517

In addition, there are special inspection procedures depending on the use of the respective article.


Amount of inspection

The amount of inspection depends largely on the compound's application profile. Please contact us concerning special approval criteria before placing the order.

The physical data stated in the catalogue are determined using standard test pieces subjected to compression moulding.

Curing conditions are determined by the compound's composition. The following parameters are normally used.

Compound Parameter
Sulphur-cured compounds Cure temperature 155°C
Peroxide-cured compounds Cure temperature 180°C
ECO compounds Cure temperature 180°C,
+ 03h 150°C tempered
Silicone compounds Cure temperature 180°C,
+ 24h 200°C tempered
FPM compounds Cure temperature 180°C,
+ 16h 200°C tempered
Torsional thrust curemeter

Torsional thrust curemeter

Reaction chamber

Reaction chamber

Torque process

Torque process