E406 Agar Gel Strength Test Method | How to Test the Gel Strength of Agar

Agar Gel Strength Test Method

How to Test the Gel Strength of Agar

Agar is a hydrocolloid derived from natural marine red seaweed and is often used as a gelling agent in the food industry and scientific laboratories.

Agar has a high gel strength and it forms a strong and stable gel structure when cooled.

Agar gel strength is mainly determined by the concentration of the agar solution and the temperature at which it is cooled. The higher the concentration of agar and the lower the cooling temperature, the stronger the gel will be.

Overall, the advantage of the high gel strength of agar makes it an increasingly versatile and widely used product in the food industry and scientific research.

Maybe you are curious about how agar gel strength is measured, so today we will introduce in detail the equipment and methods needed to test the agar gel strength.

Agar Agar Powder_Gino Biotech_Hydrocolloid Agar Agar Suppliers 8

1. Equipment and Appliances for Agar Gel Strength Testing

Electronic balance

Electronic balance (accuracy 0.001g)

Electronic balance (accuracy: 0.1g)

Multi-head magnetic stirrer

Pharmacist balance

A set of matching weights (1000g*1, 500g*1, 200g*2, 100g*1, 50g*1, 20g*2, 10g *1, 5g*1)

Constant temperature and humidity incubator

Magnetic stirrer

Flat cover (dish: 90 mm in diameter)

Beaker: 300 mL



The recipe is for reference only, the ingredients and their additions can be adjusted appropriately according to the actual situation.

It is not enough to have a vegan gummy recipe, because the production of gummies is not an easy task, and improper handling can easily cause various quality problems.

Next, we will tell you in detail how you should proceed with the manufacturing of vegan gummies according to the above recipe.

beakers (2)

2. How to Test the Gel Strength of Agar Step by Step

Weigh 1.50g (accurate to 0.001) agar powder in a weighted 300mL beaker, add 106.5g ± 0.5g distilled water, and place on a magnetic stirrer to heat and stir. Keep the solution boiling twice. Each time you boil, rinse the agar powder on the wall with a spoon filled with the test solution to ensure that the agar powder is fully dissolved.

After boiling twice, weigh to ensure that the weight of the test solution reaches 101g ± 0.8g.

Pour the solution into the upper cover of the 90mm diameter culture dish, and let it stand at room temperature (the gel weight is about 92g±1g), buckle it on the slide and put it into the 20°C constant temperature and humidity box for 4h-8h and then measure.

(1) Place the weight of the estimated strength equivalent weight on the right plate of the balance, press the left plate by hand, then put the sample on the left plate, and make the probe (cross-sectional area 1.0g/cm2) contact the surface of the gel. If the gel is not deformed in a short time, start timing with a stopwatch

(2) According to the reading of the stopwatch, by increasing or decreasing the weight (small to large), read the weight of the weight when the gel surface is broken at 13.5±1 seconds; measure at least 2 breaking points, and calculate the average value “M”

(3) Weigh the culture dish and the weight of the gel “m”

Calculation of results Gel strength (g/cm2) = (M-m)/1

In the formula:
M: measurement weight required for 13.5±1s, g; m: culture dish and gel weight, g;
1: probe surface area, cm2.

How to Test the Gel Strength of Agar (2)

3. Simplified Version of Agar Gel Strength Test Method

There are many agar factories around the world, and the testing methods for agar gel strength vary, as do the testing environments.

Therefore, even if the same sample is tested by different laboratories, the results will not be exactly the same.

Here is a simplified version of the agar gel strength test method

1. Weigh 3g of agar, put it in a 400ml beaker, and add 230 ml of distilled water.

2. Heat it in the electric stove, stirring to dissolve it completely, so that the final content is 1.5%.

3. Pour the dissolved glue solution into the quantitative container, let the glue solution cool down and put it into the thermostat, and leave it at a constant temperature of 20℃ for 4-8 hours.

4. Use the gelometer to measure its strength. The sum of the weight added to the pressure lever is the gel strength of agar.

If you would like more information about agar, such as agar production, testing methods, and industry standards, click the below button to contact our team. 

Contact Our team
How to Use Agar Agar (1)

4 Top Guides on How to Use Agar Agar

E406 Agar vs Agarose Difference between Agar and Agarose (2)

E406 Agar vs Agarose | Difference between Agar and Agarose

how to make agar agar powder (2)

How to Make Agar Agar Powder-The 3 Common Extraction Methods

About Gino Biotech

We are a biotech company specializing in the research, development, and commercialization of innovative and technological food additives hydrocolloids Agar Agar, Carrageenan, and Tailor-Made Stabilizer Solutions.

With the extended know-how and experience in the research, application, and use of Hydrocolloids, we could provide one-stop-shop customized solutions perfectly matched to the needs of our customers.

Our products cover the needs of the Meat, Dairy, Bakery, Confectionery, and other industrial sectors.

Contact our sales representative for more information

quotation-marks (1)
Scroll to Top

Explore The Good Life With Wonderful Hydrocolloids

These documents were created by experts who have been engaged in the hydrocolloids industry for more than 8 years.

These documents contain the secrets of the industry.

Leave your email to get them, it's 100% free!

The PDF about Food Hydrocolloids

* 39.4 Mb, The download link will be sent to your email.

* Your email information is absolutely safe, we will not disclose it to third parties for any reason.

Get The Exclusive

News, Resources

More about what you'll get from our newsletter!

  • Technical papers, articles and videos on food texture and stability;
  • The newest food trends, consumer demands and texture innovation;
  • The right food gums & stabilizers system that solves your challenge;
  • A team that can handle the complexity and help you formulate products;
  • Supplier selection criteria and methods and other purchasing skills.

Subscribe to Find the Secret to Connecting a Better Healthier Life!