LEXAN™ THERMOCLEAR™ MULTIWALL POLYCARBONATE SHEET TECHNICAL MANUAL
INDEX PRODUCT AVAILABILITY LEXAN™ Polycarbonate Resin LEXAN MULTIWALL SHEET LEXAN THERMOCLEAR-PLUS™ Sheet LEXAN THERMOCLEAR SUNXP™ Sheet LEXAN THERMOCLEAR Easyclean Sheet LEXAN THERMOCLEAR Dripgard Sheet LEXAN THERMOCLEAR Solar Control IR Sheet LEXAN THERMOCLEAR Solar Control Sheet LEXAN THERMOCLEAR Venetian Sheet LEXAN THERMOCLICK Sheet LEXAN MULTIWALL SHEET STRUCTURES 5 5 5 5 5 5 5 6 6 6 7 LEXAN MULTIWALL SHEET DESCRIPTIONS 11 PROPERTY PROFILE 12 LEXAN THERMOCLEAR LT2UV Sheet LEXAN THERMOCLEAR V
INDEX THERMAL PROPERTIES Thermal Insulation Overglazing Double LEXAN Multiwall Sheet Units Energy Loss Calculations Cold Radiation 22 22 23 23 23 24 CLEANING RECCOMENDATIONS 25 CONDENSATION/CHEMICAL RESISTANCE 26 Condensation Chemical Resistance 26 26 GENERAL GUIDELINES 27 Storage Handling Sawing Drilling INSTALLATION Installation Thermal Expansion Allowance LEXAN Multiwall Sheet Edge Clamping Conditions Dry Glazing Systems Wet Glazing Systems SEALING GUIDELINES Edge Sealing Sealing Tape Standar
INTRODUCTION Specialty Film & Sheet SABIC’s Specialty Film and Sheet business - part of the Innovative Plastics strategic business unit - is a leading supplier of high performance engineering sheet products, serving customers around the world in a broad spectrum of applications. Our virtually unbreakable, lightweight, fire resistant LEXAN™ sheet portfolio made with Polycarbonate (PC) technology includes many structures, ranging from solid, multiwall and corrugated sheet.
PRODUCT AVAILABILITY LEXAN™ Resin LEXAN™ resin is a polycarbonate which is a unique engineering thermoplastic that combines a high level of mechanical, optical and thermal properties. The versatility of this material makes it a suitable candidate for many engineering applications. When extruded in sheet form, due to its excellent optical and impact properties, this material can be an excellent candidate for a wide range of glazing applications.
PRODUCT AVAILABILITY LEXAN THERMOCLEAR Solar Control IR sheet (2UVIR) LEXAN THERMOCLEAR Solar Control IR sheet makes use of an innovative nano technology platform of solar energy absorption. The LEXAN THERMOCLEAR Solar Control IR sheets are transparent with a green (GN), blue (BL) or grey (GY) tint, which blocks near-Infrared light but lets in high levels of visible light. LEXAN Solar Control IR multiwall sheet offers: high light transmission combined with low solar transmission.
PRODUCT AVAILABILITY 4.
PRODUCT AVAILABILITY 16 mm 165X26 structure 20 mm 20 mm 205X32 structure 20 mm 25 mm 255X34 structure 20 mm 32 mm 325X38 structure 20 mm 8 TECHNICAL MANUAL LEXAN™ THERMOCLEAR™ MULTIWALL POLYCARBONATE SHEET, 02-2016
16 mm PRODUCT AVAILABILITY 20 mm 18 16mm mm 169X25 structure 20 mm 20 mm 20 18 mmmm 209X28 structure 20 mm 20 mm 25 mm 20 mm 259X30 structure 20 mm 25 mm 20 mm 20 mm LEXAN™ THERMOCLEAR™ MULTIWALL POLYCARBONATE SHEET, 02-2016 TECHNICAL MANUAL 9
PRODUCT AVAILABILITY 40 mm 409X43 structure 20 mm 45 mm 459X45 structure 20 mm 50 mm 509X48 structure 20 mm 55 mm 559X50 (LT2UV55S) 20 mm 10 TECHNICAL MANUAL LEXAN™ THERMOCLEAR™ MULTIWALL POLYCARBONATE SHEET, 02-2016
PRODUCT AVAILABILITY LEXAN THERMOCLICK sheet LTC404X4000 (4.0kg/m2) LEXAN THERMOCLICK sheet 40mm is an impact resistant, energy-saving multiwall sheet with profiled tongue and groove connection, including a groove for double sided tie on the inside. This inter-connecting system eliminates the need for vertical profiles, thereby saving costs and enhancing aesthetics. LTC509X (5.
PROPERTY PROFILE LEXAN multiwall sheet Products Typical property values for: LEXAN THERMOCLEAR-PLUS sheet LEXAN THERMOCLEAR Dripgard sheet LEXAN THERMOCLEAR Easyclean sheet LEXAN THERMOCLEAR SUNXP sheet LEXAN THERMOCLICK sheet LEXAN THERMOPANEL sheet (LT2UV) (LTD) (LTE) (LT2XP) (LTC) (LTP) 10 yr limited written warranty 10 yr limited written warranty 10 yr limited written warranty 15 yr limited written warranty 10 yr limited written warranty 10 yr limited written warranty Table 01: LEXAN multiwall sheet
PROPERTY PROFILE 0,80 0,79 0,78 0,78 0,68 0,79 45 46 0,56 0,57 42 0,54 46 42 42 40 0,55 0,55 0,54 0,54 Available lengths (mm) 63 62 62 58 60 Standard width (mm) 70 69 68 68 59 69 52 49 50 51 47 54 48 48 47 47 43 SCWH7A092X (%) 54 49 48 48 67 66 64 64 60 63 51 47 47 50 44 49 48 43 42 40 31 DSTWH7A092X (%) 49 TST WH7A092X (%) 51 50 0,95 0,94 0,94 0,92 0,75 0,90 0,67 0,62 0,61 0,76 0,60 0,75 0,60 0,60 0,60 0,60 LT WH7A092X (%) 76 77 76 61 70 SC 112 (%)### TST 112 (%)## 83 82 82 80 65 78
PROPERTY PROFILE Table 02: LEXAN multiwall sheet Systems Product Selector LTC5X38VENS Available lengths (mm) LTC5X34VENS TST 112 (%) ## LTC9X28VENS LT 112 (%) ## LTC3TS27VENS Available colors LTC2RS17VENS U-value # (W/m2 K) LTC2RS13VENS Weight (kg/m2) LTC5X38SC 3-Wall Tunnel 5-Wall X structure 2-Wall Rectangular 2-Wall Rectangular 3-Wall Tunnel 9-Wall X Structure 5-Wall X structure 5-Wall X structure Gauge (mm) LTC3TS27SC Structure LEXAN THERMOCLEAR sheet Venetian Printed 10yr limited writ
PROPERTY PROFILE Table 04: Typical properties for LEXAN Polycarbonate Resin Property Physical Density Water absorption, 50% RH / 23°C Water absorption, saturation / 23°C Mechanical Tensile stress at yield 50mm/min Tensile stress at break 50mm/min Tensile strain at yield 50mm/min Tensile strain at break 50mm/min Tensile modulus 2mm/min Flexural stress at yield 2mm/min Flexural stress at break 2mm/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 provides outstanding impact performance even in severe weather such as windstorm, hail-stones, snowstorms 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 Graph 01, 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 Temperature Increase Inside the Building Sunlight entering the building heats the air both directly and through absorption by the framework, furniture, etc., and is released as infra-red energy. In combination with the insulating properties of LEXAN THERMOCLEAR sheet, this prevents heat escaping faster than it is created causing a temperature increase – the so-called ’greenhouse effect’.
SOLAR CONTROL PROPERTIES 2-Wall Rectangular 2-Wall Rectangular 2-Wall Rectangular 5-Wall Rectangular 3-Wall Tunnel 5-Wall X-structure 9-Wall X-structure 9-Wall X-structure 5-Wall X-structure 9-Wall X-structure 5-Wall X-structure 5-Wall X-structure 9-Wall X-structure 9-Wall X-structure 9-Wall X-structure 6 8 10 10 16 16 16 20 20 25 25 32 40 45 50 1,30 1,50 1,70 1,75 2,70 2,60 2,50 2,80 3,20 3,00 3,40 3,80 4,30 4,50 4,80 3,56 3,26 3,02 2,48 2,27 1,88 1,77 1,59 1,69 1,40 1,51 1,32 1,10 1,04 0,99 2UVIR55S
OUTDOOR WEATHERING PERFORMANCES 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 build-up 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.
VARIOUS PROPERTIES / THERMAL PROPERTIES Sound Insulation The sound insulation characteristics of a material are largely pre-determined by its stiffness, mass and physical construction. In accordance with DIN 52210-75, the maximum obtainable sound transmission class for a particular thickness of LEXAN THERMOCLEAR sheet is listed in table 09. Thermal Insulation The multiwall 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 multiwall sheet. Double LEXAN multiwall sheet Units Extremely low U-values can be obtained by double-glazed multiwall 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. 03 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. 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 section 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 excellent 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. 13). Care should be taken to provide a clearance between both the sheet edges and the sash platform to allow for condensation drainage (See fig. 14 and 15). 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. where q = KV2 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 fig. 20). Figure 20 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 Example I Window size: width 800 mm length: 1200 mm (Ratio a:b = 1 : 1.5) Loading: 1600 N/m2 Required sheet type: LT2UV10/2RS17 Figure 21 b Example II Window size: width 1100 mm length 3000 mm (Ratio a:b = 1 : >1.
FLAT GLAZING SHEET THICKNESS Two sides clamped, glazing bars parallel with rib structure a = centre to centre distance of glazing profiles b = sheet length Figure 22 oversized hole 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 Table 20: Centre to centre distance of purlins in mm; glazing profiles 90° to rib structure Loading in N/m2 LT2UV452RS10 LT2UV62RS13 LT2UV82RS15 LT2UV102RS17 LT2UV105RS175 LT2UV163TS27 LT2UV165X26 LT2UV169X # 600 500 690 830 1010 1010 1450 1350 1450 800 1000 630 760 930 930 1325 1225 1325 590 720 875 875 1240 1140 1240 centre to centre distance (mm) 1200 1400 1600 570 680 830 830 1180 1080 1180 540 650 790 790 1130 1050 1130 520 630 760 760 1085 985 1085 1800 2000 50
CURVED GLAZING SHEET THICKNESS LEXAN THERMOCLEAR sheet can be successfully cold-curved 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 22: Examples of centre to centre distance (mm) curved glazing profiles LT2UV62RS13 Loading in N/m2 Radius “R” (mm) 900 1050 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 LT2UV82RS15 Loading in N/m2 Radius “R” (mm) 1200 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 LT2UV102RS17 Loading in N/m2 Radius “R” (mm) 1500 1750 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 3200 3400 600 800 2100 2100 1
CURVED GLAZING SHEET THICKNESS Table 22: Centre to centre distance (mm) curved glazing profiles (continued) LT2UV105RS175 Loading in N/m2 Radius “R” (mm) 1750 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 3200 5250 LT2UV163TS27 Loading in N/m2 Radius “R” (mm) 2800 3000 3200 3400 3600 3800 4000 4200 4400 4600 4800 5000 5200 5400 5600 LT2UV165X26 Loading in N/m2 Radius “R” (mm) 2400 2800 3200 3400 3600 3800 4000 4200 4400 4600 4800 5000 5200 5400 5600 5800 6000 * 40 TECHNICAL MANUAL 600 800
CURVED GLAZING SHEET THICKNESS Table 22: Centre to centre distance (mm) curved glazing profiles (continued) LT2UV169X(25) Loading in N/m2 Radius “R” (mm) 2800 3000 3200 3400 3600 3800 4000 4200 4400 4600 4800 5000 5200 5400 5600 LT2UV205X32 Loading in N/m2 Radius “R” (mm) 3700 3900 4100 4300 4500 4700 4900 5100 6300 5500 5700 5900 6100 6300 600 800 2095 2095 2050 1920 1780 1670 1560 1460 1360 1300 1200 1100 1920 1780 1620 1480 1400 1300 1200 1120 1040 980 600 800 1200 1200 1200 1200 1200 1200 1200 12
SHEET GLAZING GUIDELINES Wet Glazing Dry Glazing Figure 26 Figure 27 Metal frame sheet edge engagement ± 20 mm Glazing filler tape Silicone sealant 42 TECHNICAL MANUAL 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.
This LEXAN multiwall Technical Manual only refers to our standard portfolio. For unlisted requests or questions please contact your local agent at SABIC.
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