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UNIVERSAL 15375 BARRANCA PKWY H-106
IRVINE, CA. 92618
ENGINEERING 949.788.0424
GLASS PANEL
REYNOLDS
(970) - 241 - 4700
GHATAODE RESIDENCE
1 SUNRISE
NEWPORT COAST, CA.
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TECHNICAL MANUAL
Y 7
. 2
Fgynolds 607 Hallingsworlh St. 970.2d 1.4700, Fax 970-241.4747
ECHNOLOGY, INC, Grand Junction, Colorado 81505 USA I www.reynoldspolymer.com
Acrylic Panel Design Criteria
May 2006
Acrylic panels used for water retaining applications are designed to membrane tensile stress level
of 800 psi (56 kg/cm 2), This design parameter gives a safety factor of 11.2 based on the ASME
PVHO-1-1997 minimum standard of 9000 psi (633 kg/cm2) tensile strength. The safety factor is
13.5 based on the 10,800 psi (759 kg/cm2) average tensile strength of RPT cast acrylic.
The 800 psi (56 kg/cm2) design stress level was determined referencing a United Sates Naval
Ocean Systems Center Technical Report 1303, June 1989, "Crazing and Degradation of Flexural
Strength in Acrylic Plates as a Function of Time". It was shown that acrylic showed no signs of
crazing after ten years when the stress level was less than 810 psi (57 kg/cm2).
Crazing is a mode of plastic deformation observed in glassy thermoplastics when stressed at
temperatures below the temperature at which the plastic changes from rubbery to glassy stage.
To the eye, crazes often appear to be similar to hairline cracks. Although crazes may
subsequently break down into crack -like defects under prolonged stress, they must not be
considered in this context because the defects contain polymer materials. The polymer material
interconnects the polymer above and below the craze which contributes significantly to further
deformation resistance. These oriented microfibrils appear continuous when observed under a
microscope. Although craze yielding of products in service should always be considered,
undesirable, its occurrence is not catastrophic since the microstructure of crazes is such that
significant forces may still be carried. This is supported by the observation that under
compression, or upon annealing, crazes tend to retract and disappear. Crazing can be removed
by sanding and once the crazes are removed by this manner, the cycle starts again, i.e., if a panel
starts to craze after 15 years, and the crazing is removed, crazing will not occur again until 15
years later.
Initial deflection for panels with unsupported edges, i.e., open top tanks, butted silicone joints,
etc., will be limited to 1/400 of the length of the unsupported edge. Deflection can be limited
further, but would be a designer/architect aesthetic request, not a structural requirement for
safety.
From a structural standpoint, RPT does not design the acrylic panels to failure, but to provide a.
reasonable maintenance free life span as can be recognized with the safety factors involved.
1A0forms\manua1\design with metric May06.wpd
3
SPECIFIED VALUES OF PHYSICAL PROPERTIES FOR EACH LOT
(To be certified by the manufacturer of material)
From ASME/ANSI PVHO-1-2003
Test
Specified Values
Procedures
Physical Property U.S.
Customary Units
Metric Unit
ASTM D 256
Izod notched impact strength
0.25 ft-lb/in
13.3 J/m
ASTM D 542
Refractive index
1.49 +0.01
ASTM D 570
Water absorption, 24 hr
0.25%
ASTM D 621
Compressive Deformation at
4000 psi, 122oF, 24 hr
0.85%
ASTM D 638
Tensile:
(a) ultimate strength
9000 psi
62 MPa
(b) elongation at break 2%
(c) modulus
400,000 psi
2760 MPa
ASTM D 695
Compressive:
(a) yield strength
15,000 psi
103 MPa
(b) modulus elasticity
400,000 psi
2760 MPa
ASTM D 732
Shear ultimate strength
8000 psi
55 MPa
ASTM D 785
Rockwell hardness
M scale 90
ASTM D 790
Flexural ultimate strength
14,000 psi
97 MPa
ASTM D 792
Specific Gravity
1.19 + 0.01
ASTM E 308
Ultraviolet (290-330 nm)
light transmittance
5%
ASTM D 702
Clarity, visually rated
Must be readable
ASTM D 696
Coefficient of linear thermal expansion
at
°F 10'S(in/in oF) 0C
10'5(mm/mm °C)
-40 2.9 -40
5.22
-20 3.0 -29
5.40
0 3.2 -18
5.76
+20 3.4
-7 6.12
+40 3.7 4
6.66
+60 4.0 16
7.20
+80 4.3 27
7.74
+100 4.7 38
8.46
+120 5.1 49
9.18
+140 5.4 60
9.72
ASTM D 648
Deflection temperature of plastics
under flexure at 264 psi (1.8 Mpa)185 OF
85oC
PVH0-1 Total
residual monomer:
Method, para.
(a) Methyl methacrylate 1.6%
2.2.5
(b) Ethyl acrylate 1.6%
NOTE: This table is provided for Illustrative purposes only. The requirements of the referenced
standards have precedence.
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Material 1 -Acrylic
Type ISOTROPIC
STIFFNESS
STRENGTH
THERMAL
OPTICAL
Property 1 - thickness
Type PLATE
Bending Matl 0
Thickness - 2.80
NS Mass/Area 0.
Color 55 Layer 1 #Prop 1
Density 0.00011128 Damping 0. Ref Temp 77.
E 400000. G 0. Nu 0.35
Tension 10800. Compress 17500, Shear 10000.
Alpha 0.000043 K 0.0000025412 SpecHeat 135.131
HtGen 0.
Front Off Reverse Off
Color 110 Layer 1 Material 1 #Elem
TrShear Matl 0 CouplingMatl 0
Top Fiber 0. Bot Fiber 0.
121/T""3 0. Tshear/T 0.
231