Technical Data



Thickness Core Diameter Flange Lenght Single Height Double Height End Panel Depth Core Diameter
6.5”(165) 4”(102) 1.25”(32) 120”(3050) 15" (380) 30"(760) NA 4,25”(107)
8.5"(215) 5"(127) 1.75"(45) 5.25"(135)
10"(250) 6"(152) 2"(50) 7.5"(190) NA
12"(305) 6"(152) 3"(76) NA
14"(355) 6"(152) 4"(100) NA

Volumes & Weights


Thickness Lenght Standard Panel -cubic feet (dm³) End Panel Weight 
Std. Panel-lbs 
(kg) ±10%
Outside Cavity Net Net
6.5”(165) 120”(3050) 6.77 (192) 1.68 (48) 5.09 (144) - 117 (53)
8.5”(215) 8.85 (250) 2.63 (74.4) 6.22 (176) - 143 (65)
10"(250) 10.42 (294) 3.67 (104) 6.75 (190) 4.22 (119) 158 (72)
12"(305) 12.5 (354) 8,83 (250) 5.26 (149) 197 (90)
14"(355) 14.58 (412) 10.91 (308) 6.31 (178) 243 (110)
6.68 (185)* 7.90 (55) 5.55 (157) 175 (79)


Note: 6.5” & 8.5" panels are used for interior non load bearing applications only.

*: 14" thick panels can be ordered with 8" cavities for higher strength requirements.



Thickness Width Lenght Weight
2" (50) 30" (760) 60" (1520) 50 lbs (22.5 kg)
4” (100) 100 lbs (45 kg)

*: may be shipped 3 5/8” thick; **: can be shipped 120” long

General Data

RASTRA Panel Concrete Consumption
6½" wide 0.13 cuft per sqft (41 dm3/m2)of wall surface
8½" wide 0.21 cuft per sqft (65 dm³/m²)of wall surface
10", 12" & 14" wide 0.30 cuft per sqft (65 dm³/m²) of wall surface
Approximate Weight of Grouted Unfinished Wall
6½" 31 lbs per square foot (148 kg/m2)
8½" 42 lbs per square foot (201 kg/m²)
10" 57 lbs per square foot (274 kg/m²)
12" 60 lbs per square foot (288 kg/m²)
14" 64 lbs per square foot (307 kg/m²)
Reinforcement Consumption
15" centers 1.17 lineal feet (36m) per square foot of wall surface
30" centers 0.85 lineal feet (0.25m) per square foot of wall surface


Physical Properties


Parameter (report numbers) Rating/Value Remarks
Recycled Content ± 85% by volume Mainly post-industrial expanded polystyrene (EPS).
Bulk Density 22 lbs/ft3 ± 10% Panels for specific applications may be produced with higher density.
Compressive Strength of
56 psi Depending on density required.
Tensile Strength of THASTYRON 43 psi Depending on density required.
Water Vapor Transmission
PI-4582/ws, 5/80
7.3 This is a (dimensionless) factor to measure possibility of condensation in the wall, particularly in cooler periods or with high air conditioning; the low value of Thastyron is a guarantee that no condensation will occur.
Fire Endurance
UL – 91NK6768, 9/91, 2/99
BI – 07-106-2147, 10/96
4 hour rating (ASTM E119) A 10" un-plastered RASTRA wall has been tested for 5 hours under a load of 10,000 lbs/lin.ft.; two tests have been performed with an additional positive and negative load perpendicular to the wall, simulating a 35 mph wind pressure; with a temperature in excess of 2000°F on the exposed side the surface temperature on the unexposed side of the wall did not increase for more than 7°F; a high pressure water stream directed towards the wall immediately after burning did not penetrate the wall.
Thermal Barrier (Room Fire Test)
OPL – 15715-1808, 9/97
no flame spread
no smoke development
wall meets UBC 26-3
A wood crib is burned in a corner built with un-plastered RASTRA walls exposing it to 1700°F +/-; flame spread, smoke and any damage of the wall is monitored.
Surface Burning Characteristic
SGS – 113924. 9/98
Flame Spread Index 0
Smoke Development Index 5
NFPA Class A
UBC Class 1
ASTM E 84 (NFPA 255, UBC 8-1)
4" thick Thastyron panels were exposed to flame and spreading of the flame front and smoke density, compared to red oak was measured. The flame front was produced at less than 6", which is within the flame spread of the burner. For smoke development light absorption is measured. The test showed some very low absorption, for the test result values are always rounded to the next figure divisible by 5.
Frost Resistance
TIB – KR/SI, 10/84
Highly Frost Resistant Thastyron soaked in boiling water and frozen at -4°F; after 50 cycles no reduction of compressive strength could be found.
BI – 08-95-0338, 5/95
Low Toxic Testing conducted using Leaching Procedure by EPA SW-846 method 1311, metals by method 6010 & 7470, volatiles by method 8240; metals are less than 1/20 of regulatory limit, only traces of 4 volatiles out of 40 tested found.
Formation of Mildew
API – 17137, 4/83
No mildew & fungus growth including black mold Test cubes were kept under moist conditions for 40 days after inoculation of test germs (aspergillus niger, rhizopus nigricans). No growth of cultures could be observed; formation of mycel or konidien culture did not take place.
Water Transmission
ATI – 03-30070.01, 12/98
ATI – 03-30305.01, 12/98
Meets requirements ASTM E331, ASTM E514, meets UBC 14-1 10" thick RASTRA wall with skim coat has been exposed to a water spray with a flow rate of 5.0 USgal/ft²/hr at a differential pressure to simulate a 125mph wind. (extended testing done by US Navy and met standards).
Average Wall Humidity
MA-39 – f711/83, 10/83
Average 2.5% by volume Samples taken from a home more than 5 years in use from areas where most humidity is expected.
TUG – 52.620/83, 7/83
(as standard concrete)
Even as RASTRA panels without concrete grout show shrinking and swelling in changing humidity, shrinkage is neglectible once the concrete is poured.
Thermal Performance
MPA – 970344-Hu, 1/98
Effective R-values
20 to 49 h.°Fs.f./Btu
European testing on a 1.5m x 1.5m, and US testing of 8’x8’ walls revealed heat conductivities of 0.084 to 0.053 Btu/h°F/ft of dry, grouted 10",12" and 14" walls. DBMS values between 1.79 and 2.17 have been established for 6 U.S. climate zones. Energy usage shows even better efficiency.
Sound Insulation
BVFS – U3/19A/87, 2/87
MA-39 – F956/85, 6/85
>50dB(a) Tests have been taken in laboratories and in real buildings; as dB is logarithmic. The difference between 27dB (good for a 2x4 framed wall) and a 50dB RASTRA wall result in 199% lower sound intensity. The value indicated results is an average measured on a band width of 100 to 3150 Hz.

Structural Parameters

Pillar strength
TUG – 53.725/84, 3/84
> 70 kips/lin.ft (failure load) Tested was a pillar consisting of 1 Rastra std. Element capped with 2 end elements; concrete strength 3000psi, no reinforcement
Cyclic shear UCI – RAL 20177-IP, 9/96 10ft x 10ft: ±68 kips
5ft x 10ft high: ±20 kips
Walls have been constructed with reinforcement on 15" centers not centered in the cavity. In order to simulate high wind or earthquake loads cyclic loading in plane and a constant axial load of 10000 plf has been applied. The wall showed extreme good ductility and a deflection of 1.14" re. 1.24". Failure occurred near the base connection to the foundation. 
Narrow wall cyclic shear UCI – RAL-25683-NSW, 11/98  30" x 10ft high
load at 60": 11kips
load at 75": 10kips
load at 90": 9kips
To investigate shear resistance on very short elements of a wall specimens consisting of only 1 std. and 2 end elements have been tested. Boundary reinforcement has been increased to avoid premature failure due to flexural forces. A constant axial load of 10000plf has been used. Shear load has been applied in 3 heights to gain information about pillars with different aspect ratios.  
Slender wall UCI – RAL-23940-SW, 10/97 Axial load 1000plf, 7.5" out of center, width 45" (4 col.)
Flexural load at failure:
Wall 16ft high: 2800lbs
Wall 20ft high: 2200lbs
The specimens were loaded with a constant out of center load to simulate roof loads introduced by ledgers. The out- of-plane load was applied on 1/3 points on the side to increase the eccentricity of all loads. The walls were able to sustain the applied axial and out-of-plane loads through the deflection limits given in the codes and beyond. 
Out of plane load UCI – RAL-20177-OP, 9/96 9ft span: 9kips Load was applied in 1/3 points on a 10" Rastra element laying flat. No brittle failure occurred even as the test was continued beyond 80% peak load. Deflections at peak load were 2.44".
Lintels & beams UCI – RAL-20177-L, 9/96 Height:1 element (2 pillars) 10ft span: 21kips
5ft span: 26kips
One Rastra element was used capped on the lower side with an end element to simulate a lintel design as it may be used in the field. Support was free at 10ft distance, loaded at 1/3 points.


The outline of test results above is for rough reference only. For any application of these tests in structural calculation request the full text of these reports or ask for engineering information based on such testing.

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