willtec®
Specifications

New and Improved SONEX
Setting the Industry Standard with willtec® (a Dupont product)
willtec®, the raw material which Class1 SONEX foams are made from, is semi-flexible and easy to cut, mold, trim, laminate and install.  SONEX products made with willtec® have the following properties:
  • Excellent heat insulation properties with no flaming drip (see figure 1 below)
  • Resistance to constant temperatures as high as 302 °F (short-term up to 482 °F possible)
  • Compliance with ASTM E 84 Class 1 requirements (see below)
  • Fiber-Free
  • ISO 9001 certified
  • Light-weight, semi-flexible, with very low density (see figure 2 below)
  • Excellent sound control characteristics in a wide range of frequencies
  • Resistance to organic solvents and a variety of diluted acids and alkali
  • Economic use, easy installation, and effortless maintenance
  • Available in uncoated natural white or coated with special finishes
figure 1willtec_test1.gif (17032 bytes) figure 2willtec_cells.gif (23610 bytes)
willtec® can withstand extreme temperatures with no flaming drip
 Magnified view of willtec® internal structure of slim, flexible webs

 
willtec® light-weight, open-cell acoustic melamine material meets the following regulations.  (Where not indicated, the following testes were performed on 1" thick material):
FM VSS 302 Pass (automotive)
UTAC (Union Technique de l'Automobile du Motorcycle et du Cycle) Pass (Category 1, buses)
UL code 94, electronics HBF: Pass
HF1: Pass
VO: Pass
ASTM E 84 Class 1 Flame spread:  Natural - 5;   Painted - 10;  HPC - 20
Smoke Density:  Natural - 45;  Painted - 10;  HPC 30

the ASTM E 84 test procedure is comparable to:  UL723, ANSI/NFPA No. 255, and UBC No. 801.
FAR 25.853, aviation Passes
ASTM C 518
Thermal Conductivity		 0.25 Btu in/h ft2 °F at 68 °F
ASTM C 177
Thermal Conductivity		 0.25 Btu in/h ft2 °F at 68 °F
ASTM E 162-83
Surface Flammability of Materials
Using a Radiant Heat Energy Source		 Flame spread factor: 6.7
Heat evolution factor: 3.5
Flame spread index: 22.9
ASTM D 3574-86
  Density Test 0.7 lb/ft3
  Indentation Force at 25% - 82 ldf
  Deflection Test at 75% - 356 lbf
  Compression Set Test
  (73 F/50% r.H.)		 at 50% = 6.2%;   at 75% = 8.5%;  at 90% = 14.4%
  Tension Test, storage at 73° @B = 21.8 lbf/in2, eR = 19.5%
  22 hrs at 284° prior testing @B = 20.3 lbf/in2, eR = 18.5%
  Tear Resistance Test: Ts = 3.83 ldf/ft
ASTM C 384-85
Sound-Absorption, thickness 2"
Frequency 2000 Hz		 >90%
ASTM 662-83
Specific Optical Density of Smoke
Generated by Solid Material		 Pass, ATS 1000.001
ASTM 1000.001
Toxicity Requirements for Smoke Gases		 Pass
The data and information shown are average values in test environments which may vary and do not constitute a guarantee of performance.  Testing is recommended before actual use.

Silent Source is not directly affiliated with Illbruck Inc.

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