Manufacturer

BK Raumakustik

BK Raumakustik (Böcking Kemmerling Raumakustik GmbH) plans and delivers bespoke room-acoustic solutions made from the aPerf® material: from consulting through development to turnkey installation. Head office in Neuss, Rhine/Main branch in Frankfurt. aPerf® is a sound-absorbing nonwoven made of 100 % polyester (partly recycled PET bottles), thermally and mechanically bonded without chemical binders. The material is self-supporting and can be used without a frame, is dyed throughout, ball-impact-safe per DIN 18032, OEKO-TEX Standard 100 certified and fully recyclable. Manufactured in Germany and Switzerland. From the aPerf® materials BK Raumakustik builds wall panels, ceiling rafts, desk dividers, broadband and bass absorbers, acoustic prints and industrial hall acoustics. Member of the DGNB.

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Documents

15 mm · 300 g/m² 20 mm · 400 g/m² 30 mm · 600 g/m² 40 mm · 800 g/m²

aPerf® wool

Name: aPerf® wool
Brand: BK Raumakustik

aPerf wool

WallCeiling

Description

The soft acoustic roll of the aPerf® family (formerly 'aPerf roll'): a thermally bonded polyester nonwoven from the roll (1,200 mm wide), used as an acoustic backing, overlay or cavity absorber in wall and ceiling systems and behind perforated ceilings and slats. An emission-free, skin-friendly alternative to glass and mineral wool, additionally thermally insulating and moisture-regulating. Absorption rises with material thickness and wall distance up to the highest class A.

Technical data

Material: 100 % polyester nonwoven, thermally bonded, no chemical binders

Surface: open-pored, soft fleece

Up to fire class: Low flammability (B-s2,d0) per DIN EN 13501-1 — DIN EN 13501-1

Application: acoustic backing, cavity absorber, backing behind perforated ceilings, slats and louvres

Certifications: OEKO-TEX Standard 100; inert to fungi/bacteria DIN EN ISO 846; emission-tested AgBB 2021 / French VOC A+ / Belgian VOC

Colours: white, black

Measurement data

Sound absorption

Reverberation chamber (ASTM C423 / ISO 354)· 14 variants

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NRC

0.45

Frequency values

α_p per octave band

f (Hz)	125	250	500	1k	2k	4k
α_p	0.05	0.15	0.35	0.60	0.75	0.85

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NRC: 0.45 (derived from ISO 354 lab data)

Weight / density: 300 g/m²

Measured values as a table (14 measurements)

aPerf® wool: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	NRC	100 Hz	125 Hz	160 Hz	200 Hz	250 Hz	315 Hz	400 Hz	500 Hz	630 Hz	800 Hz	1000 Hz	1250 Hz	1600 Hz	2000 Hz	2500 Hz	3150 Hz	4000 Hz	5000 Hz
15 mm · 300 g/m² · Direct (no gap)	0.45	0.02	0.08	0.11	0.11	0.17	0.19	0.29	0.37	0.45	0.51	0.60	0.65	0.70	0.75	0.81	0.84	0.85	0.87
20 mm · 400 g/m² · Direct (no gap)	0.55	0.04	0.06	0.13	0.15	0.24	0.27	0.38	0.48	0.57	0.64	0.71	0.76	0.81	0.85	0.90	0.94	0.95	0.98
20 mm · 400 g/m² · Overall build-up 50 mm	0.65	0.04	0.07	0.13	0.19	0.23	0.34	0.44	0.57	0.67	0.77	0.82	0.86	0.89	0.90	0.89	0.88	0.87	0.83
20 mm · 400 g/m² · Overall build-up 200 mm	0.75	0.01	0.21	0.34	0.50	0.62	0.73	0.79	0.83	0.81	0.72	0.66	0.79	0.87	0.82	0.88	0.89	0.87	0.88
30 mm · 600 g/m² · Direct (no gap)	0.70	0.05	0.11	0.18	0.24	0.35	0.43	0.57	0.67	0.71	0.81	0.86	0.90	0.93	0.98	1.01	1.02	1.06	1.04
30 mm · 600 g/m² · Overall build-up 50 mm	0.70	0.06	0.08	0.16	0.25	0.32	0.45	0.59	0.72	0.80	0.88	0.90	0.92	0.94	0.95	0.95	0.96	0.96	0.95
30 mm · 600 g/m² · Overall build-up 200 mm	0.85	0.16	0.27	0.45	0.65	0.78	0.87	0.95	0.95	0.92	0.86	0.77	0.89	0.96	0.91	0.96	0.97	0.96	0.98
40 mm · 800 g/m² · Direct (no gap)	0.85	0.07	0.11	0.23	0.31	0.45	0.60	0.71	0.83	0.81	0.87	0.99	0.99	1.01	1.03	1.07	1.06	1.05	1.12
40 mm · 800 g/m² · Overall build-up 50 mm	0.80	0.08	0.10	0.18	0.30	0.38	0.55	0.70	0.82	0.89	0.93	0.95	0.95	0.98	0.97	0.98	1.00	1.00	1.01
40 mm · 800 g/m² · Overall build-up 200 mm	0.95	0.18	0.30	0.53	0.76	0.90	0.95	1.04	1.01	0.99	0.95	0.86	0.95	1.02	0.97	1.01	1.00	1.00	1.01
20 + 30 mm (2-layer) · Direct (no gap)	0.90	0.08	0.15	0.32	0.47	0.64	0.79	0.87	0.92	0.91	0.97	1.04	1.05	1.06	1.04	1.07	1.07	1.08	1.10
30 + 30 mm (2-layer) · Direct (no gap)	1.00	0.11	0.22	0.42	0.60	0.81	0.93	0.96	0.99	0.98	1.02	1.08	1.08	1.08	1.05	1.09	1.10	1.11	1.10
30 + 40 mm (2-layer) · Direct (no gap)	1.05	0.17	0.32	0.56	0.72	0.91	1.03	1.01	1.04	1.02	1.04	1.09	1.09	1.11	1.06	1.11	1.12	1.11	1.13
40 + 40 mm (2-layer) · Direct (no gap)	1.05	0.22	0.35	0.66	0.82	0.98	1.07	1.03	1.05	1.03	1.04	1.08	1.08	1.11	1.05	1.11	1.11	1.12	1.12

Measured values as a table (14 measurements)

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Last updated: 09/16/2026