We provide a wide range of support services related to rubber material performance evaluation and material development. Over the years, we have assisted in various research and development activities.
Below is an introduction to our main testing services.

【Vulcanization Test】
“Vulcanization (crosslinking)” of rubber refers to chemically bonding polymer chains—long-chain molecules—together to form a three-dimensional network structure.
By vulcanizing rubber, strong intermolecular bonds are created, which greatly improve elasticity and tensile strength.

Unvulcanized rubber stretches like chewing gum and does not return to its original shape. In contrast, vulcanized rubber forms a tightly crosslinked network of polymers that attempts to return to its initial shape, producing the characteristic elasticity and resilience of rubber.

A vulcanization test confirms the process from the unvulcanized state to full vulcanization, and is used to verify whether the formulation of materials and additives is correct.

In our company, vulcanization tests are used not only as a clue for performance evaluation during research and development, but also for quality control during massive production—conducted for every batch of rubber mixing.

【Curelastometer】
The device used for vulcanization testing is the curelastometer.
This equipment applies torsional oscillation to a rubber specimen under constant temperature and pressure, measures the torque transmitted through the specimen, and evaluates the vulcanization characteristics of the rubber compound.

Using this device, we obtain the vulcanization curve, which shows the changes in torque from the unvulcanized state to the completion of vulcanization.

The vulcanization curve changes drastically even with slight variations in the types or amounts of additives mixed into the rubber.
If there is an error in the formulation, the shape of the vulcanization curve will differ, allowing the issue to be detected immediately.

In addition, the curve provides information such as vulcanization speed and the appropriate vulcanization time, making it useful for determining vulcanization conditions for newly formulated rubber materials.

We aim to become your “rubber research and development partner” by leveraging our many years of expertise in rubber.
We listen carefully to your needs and propose solutions to your technical challenges.

If you have any issues related to rubber, don't hesitate to contact us

【Contract Testing】Rubber Specimen Preparation & Various Evaluations
https://www.nc-net.or.jp/company/73335/product/detail/123465/

【Evaluation Test】Tensile Test
https://www.nc-net.or.jp/company/73335/product/detail/124520/

【Evaluation Test】Compression Set Test
https://www.nc-net.or.jp/company/73335/product/detail/124981/

【Evaluation Test】Hardness Measurement (IRHD)
https://www.nc-net.or.jp/company/73335/product/detail/124296/

【Evaluation Test】Hardness Measurement (Durometer)
https://www.nc-net.or.jp/company/73335/product/detail/125103/

【Evaluation Test】Specific Gravity Measurement
https://www.nc-net.or.jp/company/73335/product/detail/125156/

【Evaluation Test】Rubber Adhesion/Peeling Test (Part 1)
https://www.nc-net.or.jp/company/73335/product/detail/125217/

【Evaluation Test】Rubber Adhesion/Peeling Test (Part 2)
https://www.nc-net.or.jp/company/73335/product/detail/125547/

【Evaluation Test】Rubber Permanent Set Test (Part 1)
https://www.nc-net.or.jp/company/73335/product/detail/125701/

【Evaluation Test】Rubber Permanent Set Test (Part 2)
https://www.nc-net.or.jp/company/73335/product/detail/125775/

【Evaluation Test】Rubber Tear Test (Part 1)
https://www.nc-net.or.jp/company/73335/product/detail/125981/

【Evaluation Test】Rubber Tear Test (Part 2)
https://www.nc-net.or.jp/company/73335/product/detail/126083/

【Evaluation Test】X-ray Fluorescence Analysis
https://www.nc-net.or.jp/company/73335/product/detail/126279/

【Evaluation Test】Dynamic Viscoelasticity Test
https://www.nc-net.or.jp/company/73335/product/detail/183514/