Understanding the SXJ-15 Vacuum Double Planetary Mixer’s Capabilities

Question: We produce neutral silicone sealant in the Philippines and are evaluating the SXJ-15 model. What exactly does “double planetary with high-speed disperser” mean, and how do the listed speeds and powers translate to real mixing performance? Also, is this machine only for silicone, or can we use it for other products?

Answer: The SXJ-15 is a true vacuum double planetary mixer that combines two independent mixing actions inside one vessel. The term “double planetary” refers to two frame-type paddles that not only rotate on their own axes (self-rotation) but also orbit around the vessel center (revolution). This dual motion creates an intense folding and kneading effect that reaches every corner of the batch, leaving no dead zones. For the SXJ-15, the revolution speed ranges from 0 to 43 rpm and the self-rotation from 0 to 99 rpm, driven by a 2.2 kW motor. These speeds are ideal for high-viscosity silicone sealant—fast enough to homogenize, slow enough to avoid shearing the polymer chains.

But silicone sealant often contains difficult-to-wet fillers like fumed silica and calcium carbonate. That’s where the high-speed disperser comes in. The SXJ-15 features an independent disperser shaft with its own 2.2 kW motor, capable of 0 to 2980 rpm. The dispersion disc sits concentrically inside the same vessel, turning the machine into a compact dual-shaft planetary vacuum mixer. While the planetary paddles move the bulk paste, the disperser breaks down agglomerates at high tip speed. The result is a smooth, glossy, and completely homogeneous sealant, achieved in a single cycle.

The vacuum system (≤ -0.098 MPa) works simultaneously, removing entrapped air and functioning as a planetary vacuum defoaming mixing machine. This eliminates the need for a separate deaeration step. As for versatility, the SXJ-15 is not limited to silicone. It handles epoxies, polyurethanes, thermal pastes, and even cosmetic creams. Its 24L design volume and 15L working volume fit nicely between a 5 litre lab planetary vacuum mixer machine and larger 100l capacity vacuum planetary mixer machine systems.

Below is a summary of the SXJ-15 technical highlights that directly answer many customer inquiries. You can also contact us to see how this capacity planetary vacuum mixer compares to a used planetary mixer you might be considering.

SXJ-15 Key Specifications

If your formulation requires a different configuration, we are a China vacuum planetary centrifugal mixer customized manufacturer and can adapt every detail to your production.