Specialty Film & Sheet Lexan* Thermoclear* Multi-wall Polycarbonate Sheet Technical Manual USA sharing our futures
Index Product Availability 5 Lexan* Polycarbonate Resin 5 Lexan* Multi-wall sheet 5 Lexan* Thermoclear* Plus sheet Lexan Thermoclear SunXP sheet Lexan Thermoclear Easyclean sheet Lexan Thermoclear Dripgard* sheet Lexan Thermoclear Solar Control IR sheet 5 5 5 5 5 Extension of Lexan Multi-wall sheet Products 6 Lexan Thermoclear Solar Control sheet Lexan Thermoclear Venetian sheet Lexan Thermoclick sheet 6 6 6 Lexan Multi-wall sheet Structures 7 Lexan Sheet Availability 8 Lexan Multi-wall she
13 pt praxis light Index Various Properties Temperature Resistance Dimensional Stability Continuous use temperature/UL Ratings Fire Performance Weight Factors Sound Insulation 21 21 21 21 21 21 21/22 Thermal Properties 22 Thermal Insulation Overglazing Double Lexan Multi-wall sheet Units Energy Loss Calculations Cold Radiation 22 23 23 23 24 Cleaning 25 Cleaning 25 Condensation/Chemical Resistance 26 Condensation Chemical Resistance 26 26 General Guidelines 27 Storage Handling Sawing Drilli
Index Sheet Thickness Criteria 33 Support Conditions Safety Factor Sloped Roofing Site Safety 33 33 33 33 Flat Glazing sheet Thickness 34 Four sides clamped Two sides clamped, glazing bars parallel with rib structure Two sides clamped, glazing bars 90° to rib structure 34 Curved Glazing sheet Thickness Sheet thickness recommendations 35/36 37 38 38-42 Sheet Glazing Guidelines 43 Do’s and Don’ts 43 4 SABIC Innovative Plastics
Product Availability Lexan* Polycarbonate Resin Lexan* polycarbonate is a unique engineering thermoplastic which combines a high level of mechanical, optical and thermal properties. The versatility of this material makes it suitable for many engineering applications. When extruded in sheet form, its optical and impact properties in particular render this material an ideal candidate for a wide range of glazing applications.
Product Availability Lexan Thermoclear Solar Control sheet (LTC-SC) Lexan Thermoclear Solar Control sheet features in addition to the extraordinary properties of standard Lexan Thermoclear sheet, a unique and specially developed Solar Control Coating at the non UV protected side of the sheet which reduces the heath build-up beneath the sheet. Despite the reduction of the heat build-up a high light transmission will remain. The excellent properties result in an agreeable comfort level inside the building.
Product Availability Lexan Multiwall sheet structures: 20 mm 20 20 mm mm 42RS Structure 206RS Structure 4 4mm mm 6 mm 6 mm 6 mm 8 mm 256RS Structure 25 2525 mm mm mm 10 mm 6 mm 810mm mm 10mm mm 10 20 mm 10 mm 359X Structure 163TS Structure 20 mm 20 20 mm mm 10 mm 16 mm 8 mm 1610 mm mm 103X Structure 6 mm 10 mm 20 mm 10 mm 10mm mm 10 105RS Structure 20 mm 20 20 mm mm 6 mm 6 mm 10 10 mm mm 103TS Structure 6 mm 325X Structure 10 10 mm mm 103RS Structure 18 mm 18 18 mm mm 35 mm 10
Product Availability Lexan Thermoclick sheet Lexan Thermoclick sheet system is an impact resistant, energy-saving multi-wall sheet with profiled tongue and groove connection, joint cover on the outside and groove for double sided tie on the inside. LTC404X4000 523.
Product Availability Description Lexan Thermoclear/Dripgard/Plus sheet L T ( C ) ( D ) ( 2 U V )1 0 ( 2 ) ( 3 ) ( 5 ) ( 6 ) ( 9 )( R S ) ( T S ) ( X )1 7 LT(C)(D)(2UV) 10 (2)(3)(5)(6)(9) LTC = Lexan Thermoclear sheet LTD = Lexan Thermoclear Dripgard sheet LT2UV = Lexan Thermoclear sheet 2-sides U.V. protected sheet thickness in mm 2 = double wall 3 = triple wall 5 = five wall 6 = six wall 9 = nine wall (RS)(TS)(X) 17 RS = Rectangular structure TS = Tunnel structure X = X structure 17 = 1.
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Product Availability Table1: Standard Lexan Thermoclear sheet Products Product code Lexan Thermoclear Plus sheet LT2UV452RS10 LT2UV62RS13 LT2UV82RS15 LT2UV83TS17 LT2UV102RS17 LT2UV103RS19 LT2UV103TS17 LT2UV103TS20 LT2UV105R175 LT2UV163TS27 LT2UV163X29 LT2UV163TS28 LT2UV163X28 LT2UV206RS30 LT2UV205RS33 LT2UV205X32 LT2UV256RS35 LT2UV325X38 LT2UV359X40 LT2UV409X43 LT2UV459X45 LT2UV509X48 19,69 37,20 38,58 Standard sheet width in inches.
Product Availability Continued Table1: S tandard Lexan Thermoclear sheet Products Product code Lexan Thermoclear Easyclean sheet LTE452RS1000 LTE62RS13 LTE82RS15 LTE83TS17 LTE102RS17 LTE103RS19 LTE103TS17 LTE103TS20 LTE103X20 LTE105R175 LTE163TS27 LTE163TS28 LTE163X29 LTE166RS27 LTE205RS33 LTE205X32 LTE206RS35 LTE256RS35 LTE325X38 LTE359X40 LTE409X43 LTE459X45 LTE509X48 19,69 37,20 38,58 Standard sheet width in inches.
Product Availability Continued Table1: Standard Lexan Thermoclear sheet Products Product code 19,69 37,20 Lexan Thermoclear Solar Control IR sheet 2UVIR62RS13 2UVIR82RS15 2UVIR102RS17 2UVIR105R175 2UVIR163TS27 2UVIR163X29 2UVIR166RS27 2UVIR205RS33 2UVIR205X32 2UVIR325X38 2UVIR359x40 2UVIR409x43 2UVIR459x45 2UVIR509X48 38,58 Standard sheet width in inches.
Property Profile Lexan Multi-wall sheet Products Typical property values for: Lexan Thermoclear Plus (LT2UV) Lexan Thermoclear sheet (LTC) Lexan Thermoclear Dripgard (LTD) Lexan Thermoclear Easyclean (LTE) Lexan Thermoclear Sun XP (LT2XP) *** TST opal white WH7A092X (%) 0,24 0,24 0,24 0,39 0,39 0,39 0,39 0,79 *** TST clear 112 (%) 0,164 0,205 0,266 0,307 0,348 0,348 0,348 0,389 ** LT opal white WH7A092X (%) 3-Wall 0,16 0,18 0,24 0,31 0,39 0,31 0,39 0,39 ** LT clear 112 (%) LTC42RS800 LT2UV452RS10 L
Property Profile Table 3: Typical properties for Lexan Thermoclear Venetian (LTC VEN) sheet Sheet thickness inch Structure Approx.
Property Profile Table 4: Typical properties for Lexan Polycarbonate Sheet Property Physical Density Water absorption, 50% RH / 23°C Water absorption, saturation / 23°C Mechanical Tensile stress at yield 1,97"/min Tensile stress at break 1,97"/min Tensile strain at yield 1,97"/min Tensile strain at break 1,97"/min Tensile modulus 0,079"/min Flexural stress at yield 0,079"/min Flexural stress at break 0,079/min Hardness H358/30 95 Thermal Vicat Softening Temperature, rate B/120 HTD/Ae, 1.8 MPa edgew.
Mechanical Properties Impact Strength Lexan Thermoclear sheet has outstanding impact performance over a wide temperature range, -40°C to +120°C, and also after prolonged outdoor exposure. Hail Resistance As a roof glazing material Lexan Thermoclear sheet is subject to extremes of weather; storms, hail-stones, wind, snowfalls and ice formation.
Physical Properties UV-B Middle ultraviolet region UV-A Near ultraviolet region Visible light region Near infra-red region Middle infra-red region 280 – 315 nm 315 – 380 nm 380 – 780 nm 780 – 1400 nm 1400 – 3000 nm As shown in fig. 5, Lexan Thermoclear sheet has the highest transmission in the visible light. Despite transmitting visible light very well, Lexan Thermoclear sheet is almost opaque to radiation in the UV and far infra-red region.
Solar Control Properties Solar Heat Gain The solar radiation reaching the sheet is reflected, absorbed and transmitted, as shown in fig. 6. The greatest proportion is transmitted and the total solar transmission (TST) is the sum of the direct transmission (DT) and the inwardly released part of the absorbed energy (A). Table 6 lists the solar control properties of the Lexan Thermoclear sheet range and Lexan Thermoclear Venetian products.
Outdoor Weathering Performance UV Protection Solar radiation has a particularly harmful effect upon polymeric materials initiating degradation by causing superficial surface crazing. These crazes become sites for further erosion from water, dust, chemicals, etc. The degree to which these conditions affect the polymer depend largely upon environmental parameters such as geographical location, altitude, seasonal variations, etc.
Various Properties Temperature Resistance The heat build-up of glazing materials can be seen as a function of the solar energy absorption of the glazing material and the solar intensity. In areas with intense sun radiation, and when high energy absorbing tinted glazing is installed, heat buildup of the glazing can be considerable. Calculations and actual measurements on installed Lexan Thermoclear sheet in several projects throughout Europe have shown that sheet surface temperatures of 100°C can exist.
Thermal Properties Table 9: Sound Reduction Values Lexan Thermoclear sheet Thickness inch 0,16 0,18 0,24 0,31 0,39 0,63 0,79 0,98 1,26 1,38 1,57 1,77 1,97 Lexan Thermoclick sheet 1,57 Lexan Thermopanel sheet 1,18 Sound Reduction dB 15 16 18 18 19 21 22 23 23 24 25 26 26 Thermal Insulation The multi-wall structure of Lexan Thermoclear sheet offers significant advantages where thermal insulation is a major consideration.
Thermal Properties Overglazing Installing Lexan Thermoclear sheet in front or behind the existing glazed window provides additional energy savings. For effective insulation, the best results are obtained when leaving a 20-50 mm air gap between the existing glazing and the Lexan multi-wall sheet. Double Lexan Multi-wall sheet Units Extremely low U-values can be obtained by doubleglazed multi-wall Lexan sheet units.
Thermal Properties Cold Radiation The excellent insulation properties of Lexan Thermoclear sheet will also contribute to a reduction in the radiation of cold into the building. The lower the U-value, the higher the inner sheet surface temperature will be maintained during the winter season. Fig. 9 presents an example of the temperature profile through 6 mm Lexan Thermoclear sheet when the outside temperature is -10°C and the inside building temperature is +20°C.
Lexan* sheet Cleaning Recommendations These cleaning recommendations apply to all Lexan polycarbonate sheet products, including, but not limited to, Lexan solid sheet and signs, Lexan coated Margard* sheet and Lexan multiwall sheet. Periodic cleaning using correct procedures can help to prolong service life. For cleaning, it is recommended that the following instructions be adhered to: Cleaning Procedure for Small Areas – Manual 1.
Condensation/Chemical Resistance Condensation Condensation is formed when moisture in the atmosphere changes back to water as it comes into contact with a surface at a temperature below the ‘dewpoint’ of the surrounding air. Water droplets on the surface of the glazing reduce light transmission, and, if they fall, can spoil plants or damage sensitive goods and equipment underneath. Lexan Thermoclear Dripgard sheet has a special one-sided coating that inhibits the formation of condensation droplets.
General Guidelines Storage Lexan Thermoclear sheet should be stored and protected against atmospheric influences like sun, rain, etc. Lexan Thermoclear sheets of the same length should be stacked together horizontally or, if different lengths, graded with the longest sheet at the bottom of the stack in order to avoid unsupported overhangs. The stacks should be supported on timber bearers and should not be placed where they can be walked on or driven into.
Installation Installation Glazing with Lexan Thermoclear sheet should be considered a finishing operation and seen as the final step in the completion of an application. Total thermal expansion in mm Thermal Expansion Allowance Since Lexan Thermoclear sheet has a greater coefficient of linear thermal expansion than that of traditional glazing materials, care should be taken to allow for free expansion of the sheet to prevent bowing and internal thermal stress.
Installation Dry Glazing Systems This selection illustrates some glazing proposals using commercially available profiles which have proven to be successful in combination with Lexan Thermoclear sheet. Situations may occur where sheet expansion exceeds sealant limitations and, often for aesthetic reasons, this type of ‘dry’ glazing system provides an ideal solution.
Sealing Guidelines Edge sealing In all cases Lexan Thermoclear sheet should be mounted with the ribs running downwards to assist condensation water drainage. Algae growth, in the form of a green deposit inside the sheet channels, may occasionally be a problem. It is the result of permanent condensation inside the channels due to particular temperature conditions.
Sealing Guidelines In semicircular barrel vaults both channel ends should be sealed with perforated filter tape e.g. Multifoil AD 3400. See fig. 22 Care should be taken to provide a clearance between both the sheet edges and the sash platform to allow for condensation drainage. See fig. 23 and 24. In general the total rebate depth for each profile should include a minimum of 20 mm sheet edge engagement and an allowance for thermal expansion.
Wind and Snow Loading Dynamic Wind Pressure The wind speed is used to determine the actual loading upon the glazing panels. In mathematical terms, the pressure loading is calculated by multiplying the square of the design wind speed by 0.613. q = KV2 where q = dynamic wind pressure in N/m2 K = 0.
Sheet Thickness Criteria Support Conditions Sloped roofing Note Regardless of the support configuration selected, the sheet should always be installed so that the rib structure channels are sloping downwards. Sheet “width” is the dimension perpendicular to the rib structure, “length” the dimension parallel. For sloped glazing applications a minimum slope of 5° (9 cm/m sheet length) is advised to allow for rainwater drainage.
Flat Glazing sheet Thickness The deflection characteristics in this particular configuration are dependent upon the ratio of the support bar spacing a:b, see Figure 30. In practice “a” represents the centre to centre distance of glazing profiles on the short glazing side i.e. the width of sheet. b “b” represents the centre to centre distance of glazing profiles on the long glazing side i.e. length of sheet.
Flat Glazing sheet Thickness Two sides clamped, glazing bars parallel with rib structure a = centre to centre distance of glazing profiles b = sheet length b The major factor determining the sheet deflection behaviour is the distance “a” between the centre points of two adjacent supports. Since any length of sheet can be selected, the measurement “b” does not influence the overall deflection performance.
Flat Glazing sheet Thickness In this situation, the major factor influencing deflection behaviour is the purlin spacing. The sheet width has no influence on the deflection behaviour of the sheet when exposed to loading. This means that any sheet width up to the maximum standard width can be selected. In the case of vertical glazing, should a greater span width be required, a standard polycarbonate “H” profile is sufficient to join two sheets together to form a sound, water-tight joint.
Flat Glazing sheet Thickness Table 19: Centre to centre distance of purlins in inch; glazing profiles 90° to rib structure centre to centre distance (mm) 12,5 Loading in Nm2 LT2UV452RS10 500 LT2UV62RS13 27,2 LT2UV82RS15 32,7 LT2UV103RS19 35,4 LT2UV103X19 35,4 LT2UV102RS17 39,8 LT2UV103T20 39,8 16,7 20,9 25,1 29,2 33,4 37,6 41,8 24,8 29,9 35,8 35,8 36,6 36,6 23,2 28,3 33,7 33,7 34,4 34,4 22,4 26,8 31,5 31,5 32,7 32,7 21,3 25,6 30,3 30,3 31,1 31,1 20,5 24,8 29,1 29,1 29,9 29,9 19,7 23,6 28,0 28,0
Curved Glazing sheet Thickness Lexan Thermoclear sheet can be successfully coldcurved over curved support glazing profiles, to suit many glazing applications, e.g. domes, roof-lights, etc. Providing the radius is not below the minimum recommended value, then the introduced stress by cold-curving will not have any adverse effect upon the mechanical performance of the sheet. Sheets must always be bent longitudinally, never across the width of the sheet.
Curved Glazing sheet Thickness Table 21: Centre to centre distance (inch) curved glazing profiles LT2UV62RS13 Loading in lb/ft2 12,5 16,7 20,9 25,1 29,2 Radius "R" (in) centre to centre distance (in) curved glazing profiles 41,3 82,7 70,9 59,1 49,2 42,1 47,2 74,8 59,1 49,2 39,4 35,4 51,2 66,9 55,1 43,3 35,4 31,1 55,1 63,0 47,2 37,8 32,7 28,3 59,1 57,1 43,3 35,4 29,5 26,0 63,0 53,1 39,4 32,3 26,8 23,6 66,9 49,2 36,6 29,9 25,6 20,9 70,9 45,3 33,9 27,6 24,4 17,7 74,8 41,3 31,5 25,2 22,8 17,7 78,7 36,2 29,5 23,
Curved Glazing sheet Thickness Continued Table 21: Centre to centre distance (mm) curved glazing profiles LT2UV103X20 Loading in lb/ft2 Radius "R" (in) 68,9 74,8 78,7 82,7 86,6 90,6 94,5 98,4 102,4 106,3 110,2 114,2 118,1 126,0 133,9 12,5 16,7 20,9 25,1 29,2 centre to centre distance (in) curved glazing profiles 82,7 76,0 60,2 52,0 44,9 82,7 66,1 54,3 45,7 40,2 78,7 63,0 50,4 42,5 36,6 74,8 57,9 47,2 39,8 34,3 71,7 54,7 44,1 37,4 32,3 66,9 51,2 41,7 35,0 30,7 63,0 48,4 39,4 33,1 29,1 60,2 45,3 37,4 31,5 27
Curved Glazing sheet Thickness Continued Table 21: Centre to centre distance (inch) curved glazing profiles LT2UV163X29 Loading in lb/ft2 Radius "R" (in) 126,0 133,9 141,7 149,6 157,5 165,4 173,2 181,1 189,0 196,9 204,7 212,6 220,5 228,3 236,2 12,5 16,7 20,9 25,1 29,2 centre to centre distance (in) curved glazing profiles 82,7 82,7 82,7 72,8 61,0 80,3 78,7 74,8 65,0 57,1 78,0 74,8 72,8 61,0 53,1 75,6 70,9 66,9 57,1 49,2 72,8 66,9 63,0 53,1 47,2 70,5 63,0 59,1 50,2 45,3 68,5 59,1 55,1 47,2 43,3 66,9 55,1 51
Curved Glazing sheet Thickness Continued Table 21: Centre to centre distance (mm) curved glazing profiles LT2UV205X33 Loading in lb/ft2 Radius "R" (in) 145,7 153,5 161,4 169,3 177,2 185,0 192,9 200,8 248,0 216,5 224,4 232,3 240,2 248,0 12,5 16,7 20,9 25,1 29,2 centre to centre distance (in) curved glazing profiles 49,2 49,2 49,2 49,2 49,2 49,2 49,2 49,2 49,2 49,2 49,2 49,2 49,2 49,2 49,2 49,2 49,2 49,2 49,2 49,2 49,2 49,2 49,2 49,2 47,2 49,2 49,2 49,2 47,2 45,3 49,2 49,2 47,2 45,3 43,3 49,2 47,2 45,3 43,3
sheet Glazing Guidelines Wet Glazing Dry Glazing sheet edge engagement ± 20 mm Metal frame Glazing filler tape Silicone sealant 36 37 Do’s Don’ts • Clean the window frame. Remove old putty or broken glass, if necessary. • Measure the sheet edge engagement area (± 20 mm) and internal window frame dimensions, i.e. the space into which the Lexan Thermoclear sheet will be fitted. • Calculate the sheet size, allowing clearance for thermal expansion (3 mm per linear metre).
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