With the advancement of new elastomeric materials formulated specifically for urethane, epoxy, and acrylic casting and 3D printing, silicone is a vital solution for molds to make better rapid prototypes. Leveraging silicone technologies will allow rapid prototyping houses to improve part fabrication speed, accelerate product development revisions, and enhance resolution while reducing capital equipment costs.
Whereas the mold making silicone industry has not been presented a new product for a number of years, Shin-Etsu Silicones of America Inc. is launching the SES22251 series high tear strength, high modulus, platinum cure mold making silicone. Ideal for rapid prototype houses across various industries including medical, auto/transportation, and consumer products, the SES22251 series exhibits excellent tear resistance including undercuts, low shrinkage, low viscosity and easy release – making it an excellent mold making material.
A completely redesigned formulation from SESA’s R&D Team, the SES22251 base silicone can be mixed with four flexible Shore-A hardness catalyst options (CAT22251-40/35/30/20) to achieve an optimal hardness.
Less expensive than a metal mold, the SES22251 series’ advanced silicone properties will allow designers to make parts from a silicone master mold quicker and easier for rapid prototyping of parts and new product development revisions – while assuring reduction in overall time, the cost of projects, and more pulls per mold.
SES22251 series details
- Higher tear strength: The SES22251 series consists of one base compound and four catalyst options (10:1 mix ratio) that can be mixed with it based on application requirements and desired Shore-A hardness: CAT22251-40/35/30/20. Traditionally, 40A has been a mold making industry standard, but the 35A is emerging as a go-to durometer based on superior tear strength for molds with undercuts.
- Notably, the higher tear strength of the new SES22251 formula allows more parts/pulls from a single mold, so the working life of the mold is significantly longer–equating to substantial cost savings.
- Lower viscosity: The series’ low viscosity flows better which allows silicone molds to be made easier, faster and reduces labor cost. This low viscosity de-airs more quickly–reducing the chance for unwanted bubbles. A bubble in an undesirable location can ruin the mold. This also equates to less material consumption and waste.
- Better inhibition resistance: A major issue resolved by the series is avoiding inhibition when making the mold. Inhibition occurs by contamination of the platinum from a myriad of sources. The SES22251 is uniquely formulated to make it less susceptible to cure inhibition
- Translucent color: The series is translucent so you can see the part in the silicone mold block and know exactly where to cut. This is optimal for a one-piece pour as you can pour all around the part, do the cutting line, cut the mold in half, and then take the part out. Typically, parts can be made in one day.
