People often leave messages saying that they are upset because the adult toy products often crack and ask us if we have any solutions or recommend suitable materials?
First of all, we have to find the source. The tear strength of TPE materials is poor, mainly due to the following factors:
- Problems of TPE and TPR material compounding system
The type of rubber substrate, the proportion of plastic, and the content of oil will all affect the tear strength of the compounded material.
2. The TPE and TPR materials are degraded or the performance is reduced after repeated use.
The higher the molding processing temperature, the more processing times, and many physical properties of the material, including tear strength, will deteriorate.
- Stress defects
The product has sharp inner edges or edges, and there are stress gaps, which easily lead to stress concentration. When experiencing tensile tearing with external force, product tearing often starts from these locations.
To improve the tear strength of TPE materials, we recommend:
- Improve the performance of TPE material:
A. Select the SEBS substrate with high molecular weight and star structure;
B. Appropriately reduce the amount of inorganic filler powder such as oil and calcium carbonate
Jiu Shuoxuan TPE material recently recommended a high tear product with a tear strength of more than 10N / MM. Ordinary TPE materials can only tear about 6.5N / MM. The tensile strength of TPE material reaches 22KGF / CM3. The effect is shown in the figure. After several times of stretching, the spring back has no effect:
- Understand the molding characteristics of the material and use a moderate processing temperature; pay attention to controlling the proportion of the secondary material when using it (generally, the secondary material does not exceed 25%);
- When designing products and molds, try to avoid sharp or abrupt corners, and design the corners as arcs as possible to reduce stress defects.