What is『G』 of Shock Watch Indicator?

What is『G』 of Shock Watch Indicator? How Do You Use?

What is Shock Watch Indicator?

Shock watch sticker can indicate rougher handling than shippers expected. When the indicator turns red, it can alert the consignee to check the contents carefully.

A “G” always leaves behind the shock watch indicator. Some customers view “G” as gram, but in fact, the “G” is so-called acceleration. But what does the “G” exactly mean on the shock watch indicator? Let us take you to see around.


How Much Force Can Trigger Shock Watch Indicator?

Each g shock indicator has a corresponding “G”, which means that when the indicator is subjected to a shock acceleration that exceeds the G value number, the indicator will start to become red. The larger the number is, the greater the shock force is required.

For example, the least sensitive 100G needs to be subjected to an impact force of more than about 100G, and then activated. 100G will be activated about over 90 cm; while the most sensitive 25G needs to be subjected to an impact force of more than about 25G, which is about more than 30 cm will be activated.

Shock Indicator Sticker: Activation Height Table

Drop Height For Activation

Through the following YouTube video, you can understand the approximately required impact force of each impact indicator model (25G, 37G, 50G, 75G, 100G).



Why Are These 5 Types of G Force Indicators?

Back in the 1970s, Shockwatch Inc. has only 3 models – 25G, 50G, 100G. As the market developed, the model is not applicable for users because 50G is too sensitive but 100G is too insensitive and so is 25G and 50G, so they later launched 37G and 75G. After that, the above 5 types are not applicable for heavy equipment, 10G and 15G comes to comply with market demands. 

You probably have noticed only a few of 10G and 15G are in markets. The sensitive models cause product loss during transit. However, it actually has some ways to solve the problem by adjusting the packaging material and arrangement.


10G Impact Label Impact Indicator 15G Impact Label Impact Indicator
Impact Label 10G Impact indicator Impact Label 15G shock indicator


Looking for 10G/15G impact indicators?





What is G-force?

The “G” in G-Force is the abbr. for “gravity”, which is the acceleration of gravity on earth and presents as




           g=9.8 m/s²

In fact, whether it is a car or a roller coaster when it comes to G-force, it’s all about the acceleration of cars. However, people frequently compare the volume of acceleration with the acceleration of gravity, and then there will be 1G, 2G, 3G and so.

High speed drop rapidly

For the relation between acceleration and force, we have to use the formula from Newton’s laws of motion, F=ma. “Force (F)” is equal to “Mass (m)” multiply by “Acceleration (a)”.

As acceleration is the same, the volume of force and mass of the object is proportional. All objects are subject to gravity on the earth, putting acceleration of gravity (g) into acceleration, the formula comes to F=mg which is the weight of the object.


“G” in G Force Indicator Sticker

Now, you have the concept. We can make a further discussion with the “G” in the g force indicator.

Let’s take 7ms(G): 50G for example. In general, the gravity acceleration of the shock force indicator will be accompanied by a time.


(1) 50G = 50*9.8 = 490 m/s^2 (acceleration)

(2) 490 m/s^2 (acceleration) * 7 ms (passed time)

(3) 490*0.007 = 3.43 m/s (convert to the speed at impact)


If a hard disk hits at a speed of 3.43m/s and then stops after 7ms, it will reach an acceleration of 50G.

If it hits an object at a speed of 3.43 m/s and bounces at the same speed (Newton’s law) and the elapsed time is also 7 ms, the acceleration of the hard disk is 100G.

Do you notice a simple principle? To put it simply, the g force indicator 50G means that it takes 50 times the acceleration g-force to activate the product and activate.



How to Control the “G” of Shock Watch Indicator?

It depends on the product design. There are 3 types of shock watch indicators, physical design, structural design, electric design.


Physical Design

Physical change uses the viscosity of the water drop to control the impact force.

The working is the same as the water droplets on the ceiling falling by slap or vibration. The tube is the ceiling and the water droplets are the red ink inside the tube aside. When you hit the tube by a force, the red ink falls from the top and burst out into another side of the tube. 

Let’s challenge another way. What if we change the water droplets into peanut butter? To make it falls from the ceiling, you probably make a hard effort to make it drops.


Structural Design

Structural change uses the degree of elastic materials and weight to control.

The working principle is easy to imagine. You must see traps to hook the beast. When a beast steps forward to trigger the trap, was hooked and hanging up. A leaf is too light to trigger the trap.


Electric Design

The electric design uses a 3 dimension and g sensor to detect the force with an IC to record the impact.



How To Verify  “G” of G Shock Indicator?

The verification of g shock indicator is to use the “accelerometer” for “G” value, which is commonly known as “G-SENSOR“, to read the G value at the start of shock watch indicators.




The accelerometer is widely used in various impact tests. Usually, the accelerometer will have the following data after one impact:

(1) G force

(2) Duration

(3) Frequency


The g shock indicator is to use the value read by the accelerometer to analyze and verify whether the functionality is within the specification range ±15%.


How do you use Shock Watch indicators?

The steps to use shock indicator are easy. Only peel and stick.

How to Use shock watch indicator?

However, the placement of each indicator affects the accuracy of the indicator because the indicators will be triggered only if absorb the set g force. The key points are the size of the shipment.

For Big shipment which can’t be handled by hands, apply 2 pieces at the bottom corner complementarily.

For Small shipment which an be handled by hands, apply 1 piece at the top corner.

Suggestion: Shock Indicator 50G → Bottom Corner for Large Goods Suggestion: Shock Indicator 50G → Top Corner for Small Goods

Big Shipment
Place 2 PCS On Bottom Corner Diagonally

Small Shipment
Place 1 PCS On Top Corner


Have More Questions About G Shock Indicator?




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