A practical guide to acoustic metrics for industrial noise control in Australia

Straightforward insight into IL, TL and NR for safer, more productive facilities

Industrial facilities across Australia rely on clear information to make informed decisions about controlling noise.

Whether you are a facility manager, engineer or acoustician, three key measurements help set expectations and guide the right approach: Insertion Loss (IL), Transmission Loss (TL) and Noise Reduction (NR). Each plays a different role, and together they form a dependable foundation for Australian Standards compliance and long-term workplace performance.

Flexshield relies on these measurements every day in our work across factories, workshops, refineries, fabrication plants and training centres. Our aim is simple: to give teams data they can trust so they can protect Health, Safety and Productivity without confusion or overcomplication.

Why IL, TL and NR acoustic metrics matter to industry

Australian industrial sites are busy environments, with varied equipment, structures and working conditions. These acoustic metrics help translate a complex acoustic environment into something measurable and practical.

Industrial acoustic metrics support planning, help evaluate the best screening or enclosure approach, and allow teams to confirm that improvements are working as intended. Most importantly, they provide confidence that hearing protection, communication and compliance requirements are being met.

What does Transmission Loss TL show?

Transmission Loss or TL describes how well a barrier stops unwanted noise transfer from one side to the other. It is measured under controlled conditions, which means it gives a reliable baseline for comparing different materials or constructions.

For engineers and architects, TL assists in determining the strength of a wall, enclosure panel, or barrier. When a project requires a specific level of control, TL helps ensure the selected structure meets that target.

Flexshield draws on TL data when designing long-lasting screening systems, ensuring each component delivers consistent performance.

What does Noise Reduction NR measure?

Noise reduction or NR is the difference between readings taken on each side of a barrier once it is installed on site. Unlike TL, it reflects actual field conditions. Everything from installation quality to flanking paths can influence NR, which makes it particularly useful to facility managers and contractors.

NR helps confirm that a finished build is performing properly, and also helps identify areas needing refinement. If the results fall short, the values often point to gaps, weak points or reflective surfaces that need attention.

What is Insertion Loss IL?

Insertion Loss or IL measures the overall improvement achieved after a treatment is installed. It shows how much quieter an area has become compared to the original environment.

Because IL reflects real-world improvement, it is a clear indicator of performance for project managers and acousticians alike. When working with varied equipment, outdoor plant or partial enclosures, IL often provides the most straightforward proof of benefit.

The importance of using industrial acoustic metrics together

IL, TL and NR each give part of the industrial noise control picture. When used together, they help determine what type of barrier, wall or enclosure will deliver the required result. They also help guide installation decisions, material selection, and long-term maintenance planning.

Across Australia, Flexshield applies these measurements to ensure we build every project with the right balance of durability, compliance and practicality. It is a steady approach backed by our two decades of experience and a strong focus on performance from day one.

We’ll make sure it’s built right from the start. To speak with our noise control experts, contact Flexshield on 1300 799 969 or get in touch online.

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