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Why Are Slice Ceramic Blades Safer Than Metal Blades?

When it comes to blade safety, the design challenge is to create a knife that effectively cuts most materials but has difficulty penetrating skin. Slice's patented design meets this challenge in four ways:

Difference in Blade Thickness

Cross-sections of Slice ceramic blades and typical metal blades illustrate that the wider Slice blade requires more force to penetrate skin.
Image 1. The difference that blade thickness makes is clear: metal cuts skin easily while Slice ceramic blades require much more force before they’ll pierce skin.

Length of Cutting Zone


Cross sections of the blade compare cutting zones. Slice’s double-angle grind creates a much shallower cutting zone that significantly lowers your chances of sustaining an injury.
Image 2. The initial cutting zone is defined as the part of a blade’s edge that does the actual cutting. This zone is a result of the angle used to grind the blade. In a metal blade, the smaller angle creates a longer and sharper cutting zone, making users much more vulnerable to lacerations. Slice uses a patented double grind that shortens the cutting zone significantly. This creates an effective cutting edge that doesn’t endanger the user.

Composition of the Material You're Cutting


Illustration demonstrates how downward force is dispersed with a wider Slice blade, while narrow metal blades go straight into the skin.
Image 3. Skin is hard on outside and soft on the inside. Slice engineers took this into account when designing our blades. Our wider angle displaces the force of the blade against skin’s tougher, fleshy outer layer. In contrast, with nowhere for the exterior force to go but in, narrow metal blades easily pierce skin.

Sharpness and Wear Resistance

Another factor that affects blade safety is sharpness. Metal blades are most dangerous when they are too sharp or too dull. Because metal blades dull quickly, their manufacturers ship them much sharper than necessary. This level of sharpness is effectively an invitation for accidental skin cuts. After very few uses,metal blades dull to a safer sharpness level. However, they continue to dull rapidly and soon are too dull to cut materials easily. That's when they become even more dangerous because users must exert more force to cut materials, which increases the risk of a slip and accidental cut.

Slice ceramics dull very slowly. As such, they don't need to be so sharp out of the box. They start off at a safe and effective sharpness and stay there much longer. In fact, a double-edged Slice ceramic blade lasts, on average, 11.2 times longer than its metal counterpart.

Line graph shows testing results of comparative blade sharpness over time (expressed in number of test runs).
Image 4. The above results of third-party independent testing* show that Slice ceramic blades start out at the right sharpness to safely cut and maintain that sharpness for much longer than steel blades. In contrast, steel blades go from excessively sharp to dangerously dull, with much less time in the safe and effective cutting zone.

Injuries frequently happen during blade changes. Because Slice ceramic blades are safer to touch and require fewer blade changes, their potential to injure the user is vastly reduced.

* Cutlery and Allied Trade Association (CATRA) Study performed December 2014


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