03-02-ACOUSTICAL-MATERIALS (1) acoustics

material

1. ACOUSTICAL MATERIALS
Building Utilities 3

2. ABSORPTION
The rate which sound is absorbed in a room is a prime
factor in reducing noise and controlling reverberation.
All materials used in the construction of buildings
absorbed some sounds, but proper acoustical control
often requires the use of materials that have been
especially designed to function primarily as sound
absorbs. Such materials are popularly known as
"acoustical" materials. These are also used for
reduction of noise in office buildings, hospitals and
restaurants.
Combustible or Fire –Resistant?
How much light it will reflect?
What about its structural strength,
absorption of water, and attraction for
vermin?
How foolproof is it?
Can its application be entrusted to the
average journeyman?
What is its appearance, and what are its
decorative possibilities?
How much does the material cost?
Will it be expensive to install and maintain?

3. How Sound is Absorbed?

4. How Sound is Absorbed?

5. ABSORPTIVE
MATERIALS
There are three families of devices for sound absorption:
a.Fibrous materials.
b.Panel resonators.
c.Volume resonators.

6. ABSORBPTIVE MATERIALS
b. Panel Resonators
a.Fibrous materials.
b. Volume Resonators

7. TYPES OF ACOUSTICAL
MATERIALS
THREE (3) CATEGORIES:
1.PRE FABRICATED UNITS : These include acoustical tile, which is the principal type of material available
for acoustical treatment; mechanically perforated units backed with absorbent material; and certain
wall boards, tile boards and absorbent sheets.
2.ACOUSTICAL PLASTER AND SPRAYED : On materials. these materials comprise plastic and porous
materials applied with a trowel; and fibrous materials. combined with binder agents, which are applied
with (sprayed on) an air gun of blower.
3.ACOUSTICAL BLANKETS : Blankets are made up chiefly of mineral or wood wool, glass fibers, kapok
batts, and hair felt. The physical characteristics of the materials in each of these categories will now be
considered.

8. 1. PRE FABRICATED UNITS
TYPE I –Cast Units having a pined or granular -appearing surface.
Class A -mineral units composed of
small granular of finely divided
particles with Portland cement binder.
Class B. –mineral units composed of
small granules or finely divided
particles with lime or gypsum binder.
Class C –Unit composed of small
granules or finely divided particles of
mineral or vegetable origin with
incombustible mineral binder.

9. 1. PRE FABRICATED UNITS
TYPE II –Units having perforated surface; the perforations to be
arranged in a regular pattern.
Class A -Units having a perforated
surface which acts as a covering and
support for the sound absorbent
material to be strong and durable and
substantially rigid.
Class B. –Units having circular
perforations extending into the
sound absorbent material."
Class C –Units having slots or
grooves extending into the sound
absorbent material.

10. 1. PRE FABRICATED UNITS
TYPE III -Units having a fissured surface
VERMICULITE : GOOD INSULATORS

11. 1. PRE FABRICATED UNITS
TYPE IV -Units having a felted fiber surface
Class A –
Units composed of long
wood fibers
Class C -
Units comprised of mineral
fibers.
Class B –
Units composed of fine felted
vegetable fiber or wood pulp

12. 2. ACOUSTICAL PLASTER AND
SPRAYED MATERIALS
TYPE I –ACOUSTIC PLASTER
This shall be composed of a cementitious material such as gypsum, portlandcement, or lime with
or without an aggregate.

13. 2. ACOUSTICAL PLASTER AND
SPRAYED MATERIALS
TYPE II
Acoustic materials other than acoustic plaster which are applied with a trowel."

14. 2. ACOUSTICAL PLASTER AND
SPRAYED MATERIALS
TYPE III
Fibrous materials combined with a binder agent and which are applied by being sprayed
on with an air gun or blower.

15. 3. ACOUSTIC BLANKET
The material used most commonly in the fabrication of acoustical blankets are mineral wood, hair felt, wood fiber. and
glass fiber. Although, the thickness of these blankets is generally between 1 1/2 and 4 inches, blankets of greater
thickness are sometimes used in special applications.

16. COMMERCIAL TYPE ACOUSTICAL MATERIALS FOR VARIOUS BUILDING
APPLICATIONS
POLYURETHANE FOAM
SOUND ABSORBER
Scientifically engineered pattern design to absorb the widest range of
frequencies
PATTERN
FEATURES
Effectively reduces reflected noise and reverberation time to produce safe
and enjoyable surroundings.
APPLICATIONS
Industrial, Commercial, Audio Room, Residential, sound recording studios,
radio stations, band rooms, swimming pools, churches, schools, gun ranges,
equipment enclosures.

17. COMMERCIAL TYPE ACOUSTICAL MATERIALS FOR VARIOUS BUILDING
APPLICATIONS
MELAMINE FOAM
LINEAR WEDGES
The linear wedge pattern offers, excellent absorption and allows you to create
many different designs. Install vertically, horizontally, diagonally, checkerboard as
well as create your design.
PATTERN
FEATURES
Effectively reduces reflected noise and reverberation time to produce safe
and enjoyable surroundings.
APPLICATIONS
Industrial, Commercial, Audio Room, Residential, sound recording studios,
radio stations, band rooms, swimming pools, churches, schools, gun ranges,
equipment enclosures.

18. COMMERCIAL TYPE ACOUSTICAL MATERIALS FOR VARIOUS BUILDING
APPLICATIONS
MELAMINE FOAM
SOUND ABSORBER
Convoluted Double Hump Anechoic Wedges.
PATTERN
FEATURES
Designed for sound absorption in a wide range of frequencies. Increased
surface absorption area.
APPLICATIONS
Industrial, Commercial, Audio Room, Residential, Walls, Ceilings and
partitions, sound recording studios, radio stations, band rooms, swimming
pools, churches, schools, gun ranges, equipment enclosures.

19. COMMERCIAL TYPE ACOUSTICAL MATERIALS FOR VARIOUS BUILDING
APPLICATIONS
ACOUSTICAL BAFFLES
Soft Textured Beaded Surface
PATTERN
FEATURES
Economical, multi-purpose, moisture resistant, durable lightweight and
cleanable.
APPLICATIONS
Gymnasiums, Auditoria, Classrooms, Music rooms, Arenas and Stadia,
Churches, Offices, Computer rooms, Restaurants / Cafeteria, Concert Halls
and Theaters, Gun Ranges, Manufacturing Plants, Machine Enclosures,
Water Treatment plants, Animal Hospitals.

20. COMMERCIAL TYPE ACOUSTICAL MATERIALS FOR VARIOUS BUILDING
APPLICATIONS
ABSORPTIVE/ NOISE BARRIER
QUILTED CURTAINS
Quilted pattern made of Acoustical foam or Fiberglass core, faced with quilted
aluminized fabric
PATTERN
FEATURES
Effective Durable Absorber with mass loaded vinyl barrier option.
APPLICATIONS
Effective solution to a wide range of noise control problems. Machinery and
work area enclosures, moisture or humid conditions and outdoor noise
control. Silicone fabric available for outdoors.

21. COMMERCIAL TYPE ACOUSTICAL MATERIALS FOR VARIOUS BUILDING
APPLICATIONS
MELAMINE FOAM COMPOSITE
SOUND CONTAINMENT SYSTEM
Convoluted or Flat Surface Pattern
PATTERN
FEATURES
Acoustical foam, mass loaded noise barrier with foam vibration decoupler.
APPLICATIONS
Effective solution to a wide range of noise control problems. Machinery and
work area enclosures, moisture or humid conditions and outdoor noise
control. Silicone fabric available for outdoors.

22. COMMERCIAL TYPE ACOUSTICAL MATERIALS FOR VARIOUS BUILDING
APPLICATIONS
LOW FREQUENCY SOUND ABSORBER
/ INSULATOR
Soft gray, ideal behind acoustic fabric, perforated or slotted panel surfaces.
PATTERN
FEATURES
Exceptionally good low frequency absorption. User friendly alternative to
glass fiber insulation.
APPLICATIONS
Industrial, architectural or audio applications, machinery and mechanical
rooms. For harsh noisy environment that require high performance, low
frequency reduction. Above acoustical ceiling grid systems.

23. COMMERCIAL TYPE ACOUSTICAL MATERIALS FOR VARIOUS BUILDING
APPLICATIONS
POROUS EXPANDED POLYPROPYLENE
(PPE) ACOUSTICAL WALL PANELS
Non Abrasive, slightly textured, porous
PATTERN
FEATURES
Lightweight, impact resistant, moisture, bacteria and fungi resistant.
Tackablesurface, UV Stable.
APPLICATIONS
Gymnasiums, Auditoria, Swimming pools, Arenas, Food Processing Plants,
Cafeterias, Restaurants.

24. COMMERCIAL TYPE ACOUSTICAL MATERIALS FOR VARIOUS BUILDING
APPLICATIONS
SAILCLOTH AND VINYL
ENCAPSULATED ACOUSTIC BAFFLES
Plain, mounted with fiberglass core ecanspulatedin polyvinyl fil or sail cloth.
PATTERN
FEATURES
Cost effective, lightweight, high acoustical performance, moisture and
chemical resistant.
APPLICATIONS
Any large area where noise and reverberation needs to be reduced.
Gymnasiums, community centers, sports arena, large open areas.

25. COMMERCIAL TYPE ACOUSTICAL MATERIALS FOR VARIOUS BUILDING
APPLICATIONS
POLYURETHANE FOAM COMPOSITE
SOUND CONTAINMENT SYSTEM
Flat surface, vinyl noise barrier with polyurethane foam vibration decoupler.
PATTERN
FEATURES
Highly effective on absorbing sound, noise reduction and vibration controls.
APPLICATIONS
Ideally suited to line equipment enclosures. Used to line walls and ceilings
of utility and mechanical rooms to absorb and contain the noise source.