Sound absorption classes

Sound absorption classes

1. Absorption class A 
2. Absorption class B
3. Absorption class C
4. Absorption class D

 

5. Absorption class E
6. Unclassified
7. Frequency Hz
8. αp Practical absorption coefficient

The absorption diagrams here show the practical sound absorption coefficient, αp in accordance with the international standard EN ISO 11654.

The same standard defines the sound absorption single value, αw, and the sound absorption classes, which are provided for the products in this publication.

The absorption classes are designated A-E, where absorption class A has the highest sound absorption. A specified overall dept of system (o.d.s) must always be stated for a given absorption class.

The ASTM standard C 423 specifies two different single values, the NRC (Noise Reduction Coefficient) and the SAA (Sound Absorption Average).

Both values are calculated as an average over the frequency ranges (250-2000 Hz and 200-2500 Hz respectively).

 
Overall depth of system (o.d.s.)

1. Room surface
2. Overall depth of system (o.d.s.)
3. Sound absorber

All types of sound absorption values and curves must be accompanied by a figure which gives the overall depth of mounting (o.d.s.).

Sound absorption figures without corresponding o.d.s. are inconclusive and can't be used for comparison.

 

NOTE


The stated absorption coefficients as well as the fire properties will deteriorate in the case of repainting.

Contact us

Saint-Gobain Ecophon Old Brick Kiln,
Monk Sherborne,
Tadley, RG26 5PP
General enquiries Tel: 01256 850977 
 
Sales office, for orders and stock information Tel: 01256 855220 / Fax: 01256 850600
 
Technical and product advice Tel: 01256 855250 / technical@ecophon.co.uk
 
Fax: 01256 851550
Social: LinkedIn  |  Twitter  |  You Tube

Sound absorption

What to consider when choosing the right sound absorption.

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Contact us

Saint-Gobain Ecophon Old Brick Kiln,
Monk Sherborne,
Tadley, RG26 5PP
General enquiries Tel: 01256 850977 
 
Sales office, for orders and stock information Tel: 01256 855220 / Fax: 01256 850600
 
Technical and product advice Tel: 01256 855250 / technical@ecophon.co.uk
 
Fax: 01256 851550
Social: LinkedIn  |  Twitter  |  You Tube