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TECHNICAL
TECHNICAL

TERMS
TERMS

αw: Sound Absorption Class USED IN THE CATALOG Impact Sound: Fire Resistance Class: USED IN THE CATALOG Sag Resistance:
Impact sound is generated by physical contact, such as Fire resistance is classified according to the TS EN 13501-1 Indicates a material’s ability to resist deformation
Sound Absorption / Sound Absorption Coefficient (α): footsteps or objects striking structural elements like floors standard, based on the material’s reaction to fire: or sagging under applied loads while suspended.
This term describes a material’s capability to absorb sound or walls. A1: Non-combustible
waves rather than reflecting them, a property referred to
as “sound absorption.” This process converts most of the Measurement Process: A2, B1: Difficult to ignite
C, D: Normally flammable
acoustic energy into heat energy. It’s important to note 1. Vibrations are measured on a bare floor due to L Value (Whiteness Index):
that sound absorption is distinct from sound insulation. standardized impacts, recording sound transmitted to E, F: Easily flammable Indicates the level of whiteness in a material:
the room below (frequency range: 100–5000 Hz). These
The sound absorption coefficient measures the ratio of values are summarized into a single metric: L’n,w,R. A1 is the highest rating, indicating non-combustibility, while A value close to 100 signifies high whiteness.
absorbed to reflected sound energy. A value of 0 indicates lower classes represent progressively easier ignitability.
complete sound reflection, while a value of 1 signifies total 2. Measurements are repeated after insulation is applied. s1, s2, s3: These terms classify smoke emission levels: A value approaching 0 indicates increasing blackness.
sound absorption. For instance, an αw of 0.60 implies The greater the reduction in sound level, the more s1: Minimal or negligible smoke emission.
60% sound absorption and 40% sound reflection. effective the insulation. s2: Moderate smoke emission. Measurements are performed according to the
ISO 7724 standard.
Measurement: Key Terms: s3: High smoke emission.
The sound absorption coefficient is determined according Ln: Impact sound level measured without accounting for d0, d1, d2: These terms describe the behavior
to the EN ISO 11654 standard, which also defines the indirect transmission. of burning droplets:
sound absorption value (αw) and categorizes materials d0: No burning droplets or particles for at least Impact Resistance:
into sound absorption classes. L’n: Impact sound level including indirect transmission. 60 seconds. Measures the amount of energy a material can absorb
before breaking under dynamic forces. Tested according
Ln,w: Frequency-independent impact sound level. d1: Limited burning droplets or particles. to EN 13964, Appendix D.
d2: Continuous or high levels of burning droplets.
Sound Levels and Frequencies L’n,w: Frequency-independent impact sound level,
including indirect transmission.
Sound Level (dB): Expressed in decibels, this measures Thermal Conductivity (λ: mW/mK): Surface Durability:
the intensity of sound. Ln,w,R: Improvement in impact sound level after insulation. This value measures a material’s efficiency in conducting Evaluated for resistance to wet scrubbing, rated on a
scale from 1 (highest durability) to 5 (lowest durability),
heat and is outlined in the TS 825 Thermal Insulation based on EN ISO 11998:2007.
Sound Frequency (Hz): Measured in hertz (Hz), this Rules for Buildings standard. Lower thermal conductivity
represents the rate of air pressure changes that produce values indicate better insulation properties, as the material
sound vibrations. Humans can hear frequencies ranging Inter-room Sound Insulation: conducts less heat. For optimal thermal insulation, the
from 20 Hz to 20,000 Hz, with speech typically falling This is assessed following ISO 10848-2 and conductivity value should be as close to zero as possible.
between 500 and 2,000 Hz. EN ISO 717-1 standards to evaluate sound transmission Moisture Resistance:
between rooms. Assesses a material’s ability to withstand exposure to high
humidity or persistent condensation without degrading.
Thermal Resistance (R):
NRC (Noise Reduction Coefficient): Defined by the formula R = d/λ, where:
The NRC is a simple measure of a surface’s ability to Weighted Standardized Facade Level
absorb sound energy. Difference (D₂m,nT,w): Air Leakage:
This metric calculates the difference between the sound R: Thermal resistance. Determines the rate of air seepage in pressurized areas
Scale: An NRC of 0 represents total reflection, while a pressure level measured 2 meters in front of a facade requiring a differential pressure.
value of 1 denotes complete absorption. (e.g., from traffic noise or specific sources) and the level d: Thickness of the material.
within the receiving room.
Calculation: It is the average of the sound absorption λ: Thermal conductivity.
coefficients at frequencies of 250 Hz, 500 Hz, 1000 Hz, Light Reflection (Albedo):
and 2000 Hz—key ranges for human speech, making the Thermal resistance increases as thermal conductivity Represents the percentage of light reflected by a surface:
NRC particularly useful for evaluating speech-related decreases or material thickness increases, leading to
acoustics. better insulation performance. 100% Albedo: The surface reflects all incoming light.
0% Albedo: The surface absorbs all light and reflects
none.
Airborne Sound (Rw): Wet Scrub Resistance:
Airborne sound refers to noise transmitted through the air, This measures a surface’s durability against repeated wet
which may penetrate walls, ceilings, or floors into adjacent scrubbing. Testing and classification follow the
spaces. TS EN ISO 11998 standard.
Improving Sound Insulation: Enhanced sound insulation
is achieved by adding insulation materials to structural
elements such as walls, floors, or ceilings. Corrosion Resistance:
Refers to a material’s ability to withstand chemical and
Rw Measurement: The improvement is calculated as: environmental degradation without losing its structural
Rw(after) - Rw(before) integrity or bonding properties.
This metric helps assess the effectiveness of interventions
in reducing noise transfer.
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