Material testing to determine the porosity and bulk density of materials

The material testing to determine the open porosity and bulk density helps control quality during production, and optimizes the research and development of sound insulation and sound absorption materials.

Overview of the material testing to determine open porosity and bulk density

Name of the test: Determination of open porosity and bulk density of materials.

Test method:

Article: Pressure/mass method to measure open porosity of porous solids [1].

Performed at: Laboratory, Institute of Acoustics Science and Materials (DASM).

1. Objectives and test objects

– Objective

* Determination method

• Determine total volume (basically using high-precision measuring tools) – Vt
• Determine solid skeletal volume – Vs
• Determine solid mass – ms

Formula for determining porosity:

Formula for determining bulk density

* Importance of porosity in material acoustics

Porosity is one of the most crucial factors affecting the sound absorption coefficient. Determining porosity is the simplest among acoustic parameters. Material absorption increases with higher porosity and decreases when porosity drops. This is explained by the fact that higher porosity gives sound waves more space to enter, leading to greater energy dissipation. At medium and high frequencies, porosity is the most significant factor. Typically, foam has a porosity of up to 0.9, whereas materials with lower porosity have much poorer sound absorption.

– Object:

Sound absorption materials or sound insulation materials.

2. Experimental procedure

The experimental procedure uses an impedance tube.

Steps to perform:

• Fully prepare the equipment, impedance tube, and measurement samples.
• Perform sample measurement.
• Process and report the results.

Role – and importance of the material testing to determine open porosity and bulk density

The material testing to determine open porosity and bulk density performed by the Institute of Acoustics Science and Materials helps meet practical demands such as:

• Enterprises need to control quality during production, and optimize the research and development of sound absorption materials and sound insulation materials.
• Customers need to obtain certificates and test results to enhance competitiveness and sales, or to smoothly, transparently, and compliantly install, use, and construct materials and products in projects and works.
• Users of materials can use them as a basis for comparison and calculation in designing effective acoustic rooms.

In addition, if the test sample does not meet standards, DASM will provide consulting and design solutions regarding shapes, structures, and materials to refine the design efficiently and cost-effectively.

If previously you had concerns and worries, and had to spend heavily on similar activities abroad, now you just need to contact DASM. All remaining procedures will be proactively carried out by us as a comprehensive package in the shortest time to complete your customer experience with us: DASM provides sound consulting services with truly superior quality, highly competitive pricing in the industry, and dedicated customer care policies.

Significance of acoustic testing services at DASM

Today's globalized commercial life opens up countless new markets and supply sources across five continents. Along with this come international regulations and standards that help customers easily evaluate quality, trace product origins, and select suitable or superior items. In particular, they support manufacturers in continuously improving and perfecting technology, techniques, raw materials, production methods, and sales approaches.

The Institute of Acoustics Science and Materials (DASM) is a pioneering, comprehensive, professional, and leading prestigious brand in Vietnam in the field of acoustics. On January 12, 2023, DASM was granted certificate No. 114/TĐC – HCHQ by the Directorate for Standards, Metrology and Quality (Ministry of Science and Technology), certifying registered multi-sector testing operations in the field of Mechanics and Physics (registration number: 707/TN – TĐC).

Our acoustic testing services provide customers with practical professional results to meet sustainability, standard performance, and optimal consulting, design, and calibration solutions for products and services. From there, you will update, meet, and adapt to constantly changing international standards to achieve breakthroughs in revenue and profit, and elevate your brand.

If you have a demand for performing the material testing to determine open porosity and bulk density, please contact via Hotline for detailed consultation!