What You Need to Know About Fragility

Fragility ratings help design transport case for safe arrivals.
Impact Testing

Protective cases are typically used when something delicate needs to be transported from point A to point B. And, you want to ensure it arrives intact. To many, a protective case is nothing more than a case with an inch or two of foam lining the interior. This is an overly simplistic perspective. Protective case designs are quite diverse. Often, they reflect the unique characteristics of the items they are developed to protect. Continue reading

Spider Silk: The Super Material of the Future (Infographic)


At Sierra Cases, we like to stay on top of the latest innovations in material technology, and one of the most revolutionary materials we’ve seen in a long time is spider silk. Being hailed as “the super material of the future,” spider silk is more than five times stronger than steel, ten times stronger than Kevlar, more elastic than a rubber band and yet can be found in some of our own backyards. Continue reading

Choosing the Right Humidity Indicator

Maximum Humidity Causes Mold and will Corrode Case Contents
Humidity Indicator Card

In the desert, relative humidity levels may be as low as 5%. In the tropics, 100% is possible. Anything over 40% is generally considered humid. Humidity causes metal to corrode and mold to form. Lower humidity is a problem too, as drops in temperature cause condensation. If that happens inside a transit case or shipping container, the contents can be damaged or completely ruined. Continue reading

How Transit Cases Prevent Shock Impact Damage

Rack mount case with shock isolator
Elastomeric Shock Isolator

Newton’s Laws of Motion can be problematic for electronics. Why? The first Law of Motion tells us a body will continue in motion unless acted upon by an external force. In the second law, acceleration is the rate at which an object changes its velocity. It’s dependent upon mass and force. So, drop a box from the back of a truck and it accelerates earthwards until it hits unyielding ground. The contents want to keep moving. Instead, they experience severe, possibly destructive, deceleration. Continue reading

Extreme Cold — What to Expect

Extreme cold and shipping cases
Transit Cases in the Artic

Thankfully, deserts cool off at night. That relieves the stress on equipment baking under the scorching sun. The reverse is not true in extremely cold regions. Places, such as Siberia, can see the mercury dive below -50°C (-58°F) and not substantially rise for days or even weeks. Continue reading

Preparing For the Worst: How Hot Could it Get?


Air conditioned transit cases and extreme temperaturesAccording to MIL-HDBK-310, “GLOBAL CLIMATIC DATA FOR DEVELOPING MILITARY PRODUCTS”, the highest temperature ever recorded is 58°C (136°F). This was measured in North Africa in 1922. However, in 2012, the World Meteorological Organization found flaws in the measurement method. So, the official record holder is now Furnace Creek Ranch in California with a temperature of 57°C (135°F). Continue reading

Why Injection Mold Cases

SKB carrying case
SKB Injection Molded Case

Molding processes are all very similar: a material, usually a thermoplastic, takes on the shape of a cavity. That cavity is created by a mold tool, and is a 3D mirror image of the finished part. What differs between molding processes is how the material gets into the cavity. It can be placed in it, as in rotational or compression molding, or it can be forced in under pressure, which is injection molding. Continue reading

Rotationally Molded Transit Cases: 8 Advantages

Why HDPE Transit Cases are Rotationally Molded
A Rotationally Molded Case

High-density polyethylene (HDPE) makes excellent transit cases, especially when formed by the rotational molding process. HDPE is lightweight, strong, corrosion-proof, and resistant to solvents and acids.  It remains stable through a wide temperature range. Rotational molding (roto-molding for short) distributes HDPE powder over the surfaces of a mold.  The mold is heated and rotated.  This allows liquid HDPE to create hollow shapes with complex geometries.

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The Science Behind Thermoelectric Cooling


We’re all familiar with electrical heating, but cooling by electricity? Here’s a primer to get you up to speed.

The Thermoelectric Effect

Most engineers are familiar with the thermocouple.  A pair of dissimilar electrical conductors are arranged in parallel and joined at each end. Continue reading