This type of high-temperature breathable performance tester is suitable for evaluating the breathable performance of mold shells used in investment casting. It complies with the high permeability method specified in JB/T4153-1999 and the fourth part of the performance test method for mold shells in investment casting as per HB5352.4-2004, namely the determination of breathable performance.

2.Working Principle

1. Melting furnace: The maximum operating temperature is 1000°C.

2. Quartz glass tube: Inner diameter 6mm, outer diameter 8mm, length 400mm.

3. Micrometer caliper: Measuring range is 0mm to 150mm, with an accuracy of 0.02mm.

4. Sample: The shape and size of the sample are shown in Figure 2.

Sample preparation

⑴ Take a celluloid ping-pong ball and a glass tube. Heat one end of the tube to around 250°C. Insert it into the center of the ping-pong ball while it is still hot. Then, use wax (such as beeswax) to firmly bond and seal the ping-pong ball to the glass tube.

⑵ The sample modules should be coated with six layers according to the general shell coating process or in accordance with the specific production process requirements.

⑶ After the sample has dried for 24 hours, it is subjected to calcination. Place it in the furnace at a temperature lower than 100°C, then slowly raise the temperature to 250°C to 300°C, maintain the temperature for a period of time to allow the ball to vaporize, then gradually increase the temperature to 900°C (for silica sol and quartz shell, it is 750°C), maintain the temperature for 2 hours, and then cool down to below 300°C before taking it out of the furnace.

⑷. Sample quantity

The number of valid samples is three.

3.Technical Parameter

Dongguan Lonroy Equipment Co., Ltd, located in Dongguan, Guangdong,  is a leading company specializing in the research and development, manufacturing and sales of high-tech and high-precision testing equipment. With 20 years of industry experience, we are committed to providing excellent testing solutions to customers around the world.

Our products include

1.Plastic and Rubber Testing Equipment: Melt Index Tester, Impact Tester

2.Universal Testing Machine and Tensile Testing Machine to detect mechanical properties

3.UV Aging Tester

4.Environmental Testing Equipment: Climate Chamber, Temperature and Humidity Chamber

5.Vibration Test Machine

6.Differential Scanning Calorimeter

7.And other testing instruments such as Ink Proofer, Packaging and Printing Test Machine

Our products are widely used in plastics, rubber, wire and cable, new energy and other industries, serving more than 50 countries around the world.

With annual sales exceeding US$20 million.

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Dongguan Lonroy Equipment Co., Ltd. has repeatedly achieved success in the international market with its   superb technology and high-quality services.

Adhering to the corporate mission of “providing customers with   accurate testing instruments, enhancing product value; creating development opportunities for employees”,we look forward to creating a better future with global partners.