Questioning the definition of coolness: The line between "fabric" and "product" hidden in solar reflectance values

In the scorching summer sun, what we look for in a parasol is the peace of mind that our skin won't burn, and most importantly, "coolness." We see high numbers like "heat shielding rate XX%" listed in the specifications, and we pick them up expecting the coolness of shade.

However, have you ever used one and felt it wasn't as good as you expected? In fact, there are two main evaluation methods for testing the heat shielding performance of parasols. Understanding this difference is an important step to finding a truly comfortable parasol, beyond just comparing numbers.

Heat Shielding Rate Test: Measuring the "Potential of the Material"

The first is a heat shielding rate test (JIS L 1951, etc.) that measures the insulating power of the "fabric itself" used in the parasol. This involves shining artificial sunlight on a flat fabric sample and measuring the temperature rise on the back side.

This is like bench testing only the output of an engine. It shows the "fundamental physical strength as a material" – how much heat the PU coating on the back, the density of the threads, and the color can block.

However, we don't walk around wearing "cloth." A parasol is a three-dimensional dome, with a frame and layers of air. No matter how excellent the fabric's individual numbers are, they don't necessarily correspond to the "feeling when holding the parasol." This is where the difficulty and depth of choosing specifications lie.

Heat Shielding Effectiveness Rate: Measuring "Spatial Comfort"

Another approach is a method called heat shielding effectiveness rate, which conducts tests on the actual finished "umbrella shape." Artificial sunlight is shined on the open parasol, and the temperature change inside the parasol is precisely measured.

The advantage of this test is that it can evaluate the "overall quality of the shade," including not only the performance of the fabric, but also the size, silhouette, and even the effect of reflections from the inner color of the parasol.

For example, our "HEATBLOCK" series naturally assumes 100% light blocking and high heat shielding properties of the fabric itself. However, we deliberately emphasize the test results of the product in its finished state because what customers receive is not "cloth," but the "moving shade" itself underneath it.

Deciphering Parasols Like Smart Gadgets

If you are a "tech enthusiast" who scrutinizes device specifications, then please take a look at the "basis" of the heat shielding notation on parasols.

• Are the numbers for the fabric alone?

• Or are they for the product in its assembled state?

It would be ideal if both data were disclosed, but especially the "heat shielding effectiveness rate" results for the product more faithfully reflect performance during actual use.

The act of choosing a parasol is similar to choosing "equipment" to survive the harsh summer environment. Don't be fooled by superficial numbers; understand what those numbers prove. This intellectual curiosity will surely be the shortest route to a truly cool summer.