Amorim Industrial Solutions: Products - Acoustic Core Materials



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Acoustic Core Materials

The materials

Amorim-ISO-Core materials were developed through the combination of elastomers with graded cork micro-granules, that can be processed in sheets or rolls, according specific sizes and thicknsses.

Application in sandwich panels

Sandwich panels are common products used as acoustic barriers in ceilings, floors, walls, and engine hoods of railway carriages, buses, trucks, luxury yachts, etc. Depending on the application, sandwich panels can be made of a wide range of construction materials. In addition to the mechanical and structural properties, the acoustic properties of the core material used is very important. The use of Amorim-ISO-Core materials is based on CLD (Constrained Layer Damping) and SLD (Single Layer Damping) concepts.

Air borne noise transmission loss and thermal insulation

The following chart and table illustrate the variation in the air borne noise transmission loss and in the thermal insulation properties of sandwich panels made with different types of core materials using the same types of plywood at the same overall thicknesss (15 mm). The analysis of these certified test¹ results show that the use of AMORIM-ISO-Core materials offer two important advantages when compared to a plywood panel without core material:

A significant increase in the air borne isolation of the panel.
A remarkable improvement in the thermal insulation of the panel.

Type Of Core Material	Layer Thickness (mm)	Surface Weigth (kg/m²)	Rw (dB)
Plywood	15	13,3	18
CDM/ACM-29	6 + 3 + 6	7,4	29
CDM/ACM-15	6 + 3 + 6	10,7	30
CDM/ACM-17	6 + 3 + 6	12,7	31

Technical Support, QC and R&D

Amorim provides technical support to panel manufactures regarding the use of Amorim-ISO-Core materials in sandwich panels. Amorim uses its own in-house test facilities to evaluate the mechanical, physical and long term behaviour of its products. Certified tests are carried out in co-operation with universities and official testing organizations.
Our R&D department uses a method called Finit Element Analysis (FEA) to achieve noise and vibration reduction in the design of sandwich panels.

CORE PROPERTIES	CDM/ACM-29	CDM/ACM-15	CDM/ACM-17	CDM/ACM-63
Density (Kg/m³)	212	635	966	890
Compressibility 400 psi (%)	34 (@100psi)	37	22	26
Recovery 400 psi (%)	78 (@100psi)	82	86	87
Tensile Strength (MPa)	0,6	1,3	2,3	2,3
Compression Set-50%def,RT,70h(%)	56	15	10	11
Thermal Conductivity W/mK (ISO8301)	0,044	0,140	0,177	0,158
Stress at 10% compression (MPa) (3mm specimen)	0,28	0,83	1,85	1,76
Glass Transition Temperature (Tg) (ASTM E1640)	-66ºC	-65ºC	-71ºC	-51ºC
Loss Factor at 20ºC (ASTM E1640)	0,14	0,20	0,17	0,25
Max Loss Factor at 1Hz (ASTM E1640)	0,25@100ºC	0,26@-54ºC	0,42@-52ºC	0,35@4ºC

¹ The tests were performed in certified laboratories and in accordance with ISO717, NBN-S01-400, and DIN52210.