Smartphone and tablet protective cases are handled frequently and exposed to friction, skin oils, dust, and accidental contact with other objects. In addition to protection, consumers often look for a comfortable grip, an attractive finish, and colors that match their personal preferences.
Si-TPV 3521-70A for soft-touch overmolding
Si-TPV 3521-70A is specifically positioned for soft-touch overmolding in smartphone cases, portable electronics, and wearable electronic devices. It offers a skin-friendly tactile feel and is designed for adhesion to suitable polar substrates, including PC and ABS.
For protective case designs that combine a rigid plastic structure with a soft-touch exterior or grip section, Si-TPV 3521-70A is a candidate for evaluation. Its Shore A hardness of 71, tensile strength of 17 MPa, and elongation at break of 646% provide useful reference points when assessing material flexibility and mechanical performance.
The actual suitability of the grade depends on the substrate formulation, mold design, processing conditions, and required bond strength.
Si-TPV 3420-90A for selected high-hardness case applications
Si-TPV 3420-90A can also be considered when evaluating consumer electronics case designs that require a firmer elastomeric feel and surface durability. The required hardness, surface finish, and processing method should be assessed against the intended case construction.
It is important to distinguish a material used as a case component from one used for overmolding. For overmolding applications, the specific substrate compatibility of the selected 3420 grade must be confirmed rather than assumed from its hardness or series name.
Key Benefits for Protective Cases
Soft-touch comfort: A pleasant tactile feel for frequently handled surfaces.
Scratch and abrasion resistance: Helps address everyday friction and surface wear.
Stain resistance: Supports easier maintenance of suitable finished surfaces.
Color customization: Provides opportunities to develop different colorways and product finishes.
Appearance retention: Selected grades offer resistance to yellowing and unwanted surface stickiness under appropriate conditions.
For manufacturers developing premium smartphone and tablet accessories, these material properties can help balance tactile quality, visual differentiation, and long-term usability.
