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cab insulation

noise curtains

vibration control

Whispermat

Whispermat is a noise control material specifically designed to achieve maximum attenuation over a broad frequency range. Whispermat combines dense, limp, flexible, non-lead loaded barriers with Hushcloth^© foams providing a total noise control system. Unlike other composites available, these multilayer systems are manufactured without costly adhesives, thus eliminating the potential for failure between layers.

High Transmission Loss - The barrier's ability to impede airborne noise.
High Noise Reduction Coefficients - The foam's ability to absorb airborne sound energy with minimum reflection.
Damping - The composite's ability to attenuate structure-borne vibration on metals and plastics thereby reducing reradiate noise and material fatigue.

The diversity of constructions makes possible engineered solutions for most OEM and in-plant applications. Whispermat is available with single and double layer septums, various barrier weights, foam thicknesses and a variety of surface treatments. Whispermat is available in rolls, sheets, die cut or fabricated to customer specifications or can be easily cut with a knife or scissors. These composites can be adhered to the substrate with factory supplied, economical, SBR pressure sensitive adhesive or an acrylic based pressure sensitive adhesive for temperatures up to 250^o F. It is recommended that a contact adhesive or mechanical fasteners be used for these heavily loaded composites in overhead applications.

Many OEM customers have dB Engineering cut their acoustical material into parts so that assembly can be made easily at their facility. These parts can be shipped by the part number as seen in this photo, or sent as a predetermined "kit." These "kits" consist of several different parts that are grouped together to go to one particular product on the assembly line. (Click to enlarge)

Physical Properties:
Typical of Most Composites

Color Barrier - Black; Foam - Charcoal Gray
Density Barrier - 1.5 to 2 lb./ft².; Foam - 2lb./ft.³
Tear Strength 20 lbs in min. ASTM D624, DIE C
Tensile Strength 240 lbs sq. in. min. ASTM D 412, DIE 1
Peel Strength 2.2 lbs in. min., ASTM D903
Elongation 120%
Flammability MVSS 302, SAE J369, Special Formulation to UL-94V and FAR 25.853
Temperature Range -30 degrees Fahrenheit to +200 degrees Fahrenheit
MIL-STD-810 at 250 degrees Fahrenheit, 7 24 hr. periods PASS
Cold Crack MIL-STD-810 at -25 degrees Fahrenheit, 1&quote mandral PASS
Thermal Conductivity .30-.38 BTU in per hr. sq. ft. degrees Fahrenheit ASTM C518

Acoustical Properties:
Sound Transmission Loss, dB (ASTM-E90-75)

Barrier Weight				Frequency (Hz)
lb/ft²	125	250	500	1K	2K	4K	STC
.5	10	12	16	21	26	32	20
.75	12	16	20	25	28	34	23
1	15	17	21	27	32	36	26
1.5	14	19	25	36	33	37	30

Whispermat non-reinforced barrier septum is a flexible vinyl used by itself or in combination with absorptive material as an additive mass treatment for existing equipment enclosures or housings, and as a pipe or duct wrap. Whispermat reinforced vinyl is used in conjunction with grommets and Velcro to provide a suspended enclosure for in-plant applications. It is available with quilted or encapsulated fiberglass for added absorption and to meet Class A flammability requirements.

Acoustical foam is the most versatile of all noise control materials. dB Engineering has the right foam for your application.

NOISE BARRIER

Barrier materials block noise. Flexible noise barrier is a limp, tough, high-temperature-fused vinyl loaded with nonlead fillers and/or reinforced with high-strength fabric. They resist passage of sound waves and reduce noise transmission.

PHYSICAL DATA

Weight/Sq.Ft.	1 LB
Tensile (PSI)	762
Gauge (Inches)	.108"
Elongation (%)	200%
Die "C" Tear (#/In.)	114
200 Deg. F/7 Days	No Deformation: <1% Shrink
Mil Std. 6411 Burn Test	9 (Pass)
MVS 302 Burn Test	Pass: Self Extinguished
STC	26

Noise Transmission Loss:

Barriers	Noise Transmission Loss (dB) per Octave Band (HZ)
Barriers	125	250	500	1000	2000	4000	STC
2 lb. PSF	16	22	26	32	35	40	31
1 lb. PSF	13	17	22	26	32	37	26
3/4 lb. PSF	11	16	20	25	30	34	23
1/2 lb. PSF	8	13	17	22	27	31	20
Per ASTM: E-90 (90A)

FOAM BARRIER COMPOSITE WITH FACING

A sandwich composite incorporating 2 layers of Hushcloth acoustical foam and a single barrier septum. When applied to sheet metal, plastic, or wood, the isolation foam layer, typically 1/4" thick, decouples the barrier while the thicker absorption layer reduces airborne sound. This economical acoustical system can be formulated to provide maximum noise reduction in the harshest environment by adding various facings or embossed surfaces.

This composite is used in many engine compartments that are driving generators, pumps, hydraulics, etc. The reflective mylar face helps to reject radiant heat while the foam barrier combination gives excellent noise reduction. Several companies request dB Engineering to cut noise and thermal "kits" so that they can be quickly installed with the minimum amount of waste. Note that this manufacturer uses "mechanical fasteners" to anchor the composite to the enclosure walls and roof panels. (Click for larger photo.)

Optional Surface Treatments	Standard Sizes
Embossed Convoluted, Aluminized Polyester,	Rolls 54" x 50'; Sheets 54" x 72"
Reinforced Polyester, Urethane-Matte or Impervious,	Fabricated or Die Cut Parts
Perforated Vinyl (Sandpiper, Black), Tedlar (Dupont)	Foam Thickness 1/4" - 2"
Custom Facings Available

Absorber	Frequency (Hz)
	125	250	500	1K	2K	4K	NRC
WM2 - 1" Absorber	.04	.36	.95	1.05	1.02	.98	.85
WM2 - 1" Absorber Aluminized Face	.13	.32	.39	.38	.87	.43	.50
ASTM C423-90a Absorption Coefficient

Acoustical Floormats

dB Engineering has been supplying the transportation industry with high quality acoustical floormats since 1979. Most of the floormats have the same basic composites that give high noise transmission loss as well as a handsome finished appearance for the interior of vehicle cabs. Instead of a cheap open cell underlay, dB Engineering uses a high quality closed cell that performs better at low frequency and does not allow water to soak into the material. The other two composites include a one pound per square foot barrier and a non-slip surface. (Click photo to enlarge.)

BARRIER

Physical Property	Description - Value	Tolerance
Material	Flexible PVC vinyl (polyvinylchloride)
Color	Charcoal Gray
Weight	1.0 lb/sf	0.1 lb/sf
Flammability	MVSS-302
Service Temperature	-40^o F to 220^o F
Chemical Resistance	Excellent for most acids, mild alkalis, oils & grease

FOAM

Physical Property	Description - Value	Tolerance	Test Standard
Material	Nitrite/PVC
Thickness
Color	Black
Density	5.25 lb/cf	+/- 1.75 lb/cf
Flammability	MVSS302,UL94,V-04,HF-1
Tensile Strength	45 psi	+/- 20 psi	ASTM D412
Elongation	150%	+50%	ASTM D412
Temperature	-20^o F to 180^o F		ASTM D1056
Compression	5.25 psi	+/- 1.75 psi	ASTM D1056
Water Absorption	5% Max		ASTM D1056
Ozone Resistance Rating	0 72hrs@ 100pphm - 104^o F		ASTM D1171
Classifications	MIL-C-3133c,MIL-STD-670B,SCE-3,SBE-3
Compression Set	40% Max		ASTM D1056

FACING

Physical Property	Description - Value	Test Standard
Material	Deep Twist Grain Vinyl
Thickness	0.029 to 0.035 inch thick
Tensile	Min 120 x 103	CFFA-17
Trapezoid Tear	Min 25 x 25	CFFA-16C
Tack Tear	Min 67 x 59	CFFA-14
Cold Crack	Pass	0 °F Masland
Flammability	S/E	FMVSS-302
Grain Retention	No Change	5 min.@ 300^o F
Weight oz/yd²	25.1 oz/yd² +/- 10%	CFFA-20
Width	56" min 58" max
Adhesion	5.0 # min	CFFA-3
Seam Strength	72.9 x 63.4	CFFA-14

ACOUSTICAL PROPERTIES

ASTM E90 and E413 on 1 lb/sf barrier only
Frequency	125	250	500	1000	2000	4000	STC
TL (dB)	17	19	24	29	34	40	28

AVAILABLE SIZES

Roll	54" x 25'
Sheet	54" x As Specified

Ultima WM2X

When intense noise reduction is required in the least amount of space, the Ultima composite will probably be the best choice. This composite combines all three basic noise reduction properties in one product-damping, absorption, and barrier. Several industries use this complete composite inside vehicle cabs, medical enclosures, and electronic housings to solve excessive and irritating noise levels. (Click photo to enlarge)

HUSHCLOTH HT-NM COMPOSITE

Click photo to enlarge

This composite has the advantages of being extremely durable, able to withstand high constant service temperatures, very low thermal conductivity, and excellent noise absorption at both high and low frequencies. It can be combined with several facing films, barriers, and pressure sensitive adhesives to give a composite that will fit most applications.

REINFORCED POLYESTER FACING

Description and Advantages:
Alpha Style VRP-3 is a triple ply laminate of a white vinyl face with a metalized polyester film backing, and a fiberglass scrim tear stopper. The components are adhered together using a high-temperature flame retardant adhesive. It offers many advantages among which is its excellent vapor barrier qualities. The material can be used through a broad range of temperatures and is non-denting. The material can also be readily cleaned. It has superior strength and excellent light reflectivity.

Construction:	White PVC Film
	4 x 3 Fiberglass Scrim 75G
	.0005" Metalized Polyester Film

PROPERTIES	VALUES	TEST METHOD
Weight, oz./sq.yd.	4.2 (140 g/m²	ASTM-D-1910
Moisture Vapor Transmission	0.02 max.	ASTM-E-96
U.S. Perms		Method A
Tensile Strength, lbs/in.
MD -	30 (138N)	FED STD 191/5102
CMD -	25 (111N)
Tear Strength, g.
MD -	1600g	ASTM-D-1424
CMD -	1600g
Beech Puncture, scale units	100	ASTM-D-781
Mullen Burst, psi		ASTM-D-774
Vinyl up -	80 (551 kPa)
Vinyl down -	75 (517 kPa)
Corrosion Resistance and	None	41^o C, 100% RH
Loss of MVT		30 days
Light Reflectivity 90%		ASTM-C-523
Water Resistance	No delineation	1 hour water soak 23^o C
Dimensional Stability	5% max. loss	ASTM-D-1204
Light Stability, 125 hrs.	No change	ASTM-G-23 Type A
Cold Crack, -12^o C (+10^o F)	No Crack	ASTM-D-1790
U.L. Fire Hazard Classification:		ASTM-E-84
Flame Spread	15
Smoke Development	50
This product is UL listed

NEEDLEMAT

Hushcloth HT-NM (High Temp - Needle Mat)
HT-NM is a mechanically bonded glass fiber insulating blanket of uniform density that offers reliable superior performance at temperatures up to 1200 degrees Fahrenheit. HT-NM meets U.L. Requirements (Ref. #R11184). All requirements of military specifications MIL-I-24244 and MIL-I-16411 and all pertinent automotive specifications.

HT-NM is manufactured from a well controlled assortment of long glass textile fibers to assure uniform mechanically bonding with no additional binders. Product quality is maintained through a carefully controlled needling process which creates uniform insulating efficiency during extended exposure to elevated temperatures.

HT-NM is available in standard 1/4", 1/2", 3/4", and 1" grades.

Thermal Conductivity
According to independent testing, HT-NM meets or exceeds the following "K" factor requirements for MIL-I-16411, Type II.
Temperature	BTU in./hr./sq.ft./deg.f
300F.	.40
500F.	.50
700F.	.65

Product Characteristics:

Low thermal conductivity
Non-toxic
Good dependability (Conforms to irregular surfaces
Non-combustible
Excellent vibration resistance (Will not powder).
Odorless (Will not absorb odors.)
Will not contribute to metal corrosion.
Excellent sound absorption properties.
Will not decay or sustain mold or vermin.
Conforms to MIL-I-16411 and MIL-I-24244
UL Listed (Ref# R11184)
Flame Spread - 0 Smoke Dev. - 0

Acoustical Ratings
Sound Absorption Coefficients
Frequency	1/4"	1/2"	1"
250	.10	.13	.46
500	.18	.24	.68
1000	.29	.67	.85
2000	.81	.92	.95
4000	.99	.99	.99

Physical Properties
Grade (thk.)	Mass (ozs./sq.ft.)	Width (inches)	Roll Length (feet)	Area (sq.ft./rl.)	Weight (lbs./rl.)
1/4	4	60	150	750	185
1/2	6	60	75	375	140
3/4	12.25	60	45	225	172
1	15	60	45	225	215

BARRIER

Physical Data: Barrier Septum

Weight/Sq.Ft.	1 LB
Tensile (Psi)	762
Gauge (Inches)	.108"
Elongation (%)	200 %
Die "C" Tear (#In.)	114
200 Deg. F/7 Days	No Deformation:<1 % Shrink
Mil. Std. 6411 Burn Test	9 (Pass)
MVS 302 Burn Test	Pass: Self Extinguished
STC	26

Table showing how the human ear perceives noise reduction.
Decibel Reduction	Reduction Experienced by Ear
2	15%
4	23%
6	38%
8	48%
10	56%
12	63%
14	68%
16	75%
18	77%
20	81%

All our foam products do not drip upon ignition, cease to burn after removal of the source of ignition and produce a minimal amount of smoke.

IMPORTANT: When the foam is subjected to dirt, grease, moisture and chemical attack, it may require a foam with a protective surface treatment such as our Metalized Mylar or Matte Film Finish foams above.

Most of our products meet all the requirements of UL-94, MVSS-302 and FAR 25.83b. Call or e-mail to request expanded specifications and technical data sheets.

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your specific needs and quantity.

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