EFTA02305985.pdf

PLEXIGLAS MIRROR INSTALLATION Foam Tape Source AND ATTACHMENT RECOMMENDATIONS 3 M Company (For ceiling installation and attachment 3 M Comp Industrial Tape Div. recommendations see page 9.) 3 M Center.. Paul, Minnesota ADHESIVE ATTACHMENT Silicone Sealants Double-laced Foam Tape. Plexiglas mirror may be installed on many types of Double-faced loam tape may be used for most surfaces or attached to itself using silicone seal- Plexiglas mirror mounting requirements. The tape ants as adhesives. Silicone sealants should be is simple to use and provides the cleanest method used in place of mastics or panel adhesives. Panel of attachment. The tape may be used for small adhesives tend to destroy the reflective coat. Sili- fabricated items to adhere Plexiglas mirror to itself cone sealants will remain flexible for long periods or Plexiglas mirror to another material. Double- of time and are readily available from building sup- faced foam tapes provide the flattest mounting and ply centers and Authorized Plexiglas Distributors thus, the best image reproduction in Plexiglas mir- in either small tubes or caulking gun sizes. When ror installations. To obtain optimum flatness of the I using silicone sealants as adhesives, they should mirror, the foam tape should be cut into panel be applied to the Plexiglas mirror in evenly dis- length pieces. The pieces should be distributed persed, open end beads; this will allow the adhe- evenly over the back of the mirror. The surface to sive to cure properly. The Plexiglas mirror may which the mirror is to be placed should be flat, have to be supported or secured with tape for 24 smooth, clean and should not have significant sur- hours until the sealant cures. Use only pigmented face irregularities such as that found on a stuccoed silicone sealants on Plexiglas mirror; clear silicone surface. The tape should be no less than 14 / " from sealants will cause failure of the mirror appearance. edges of Plexiglas mirror. Recommended Silicone Sealants Dow Corning DC 780 Silicone Building Sealant Dow Corning Company Midland, Michigan Contact Cements Contact cements can be used for installing Plexiglas mirror on many types of surfaces. They are useful when fast drying or setting of the bond is necessary. Contact cements do require the ap- plication of the adhesive to both the Plexiglas mirror and the surface to which it is being attached. Apply the cement with a fine brush, enamel paint roller, or spray it on in order to apply it evenly. Wait The following table lists recommended foam tape until the cement dries sufficiently so that a piece of sizes to be used with specific sizes of Plexiglas paper will not stick to it before placing the Plexiglas mirror and recommended placement of the tape mirror into position. This allows the solvents in the for optimum flatness. cement to evaporate. Applying the Plexiglas mir- ror before the cement is dry will result in failure Foam Tape Recommendations in the mirror appearance. Since the mirror cannot be moved after placement, a slip sheet of kraft Plexiglas Foam Total Length paper should be used between the two cemented Mirror Tape of surfaces to position the mirror properly. Because Thickness Thickness Term of thermal and humidity expansion of Plexiglas mirror, the size of a Plexiglas mirror panel is lim- Up to 12" x12" ye" 3% minimum t Me" t ited to the following recommendations. The chart 14" Ye" 1W minimum provides the maximum allowable long dimension Up to 36" x 48" with temperature change of area of use of Plexiglas Up to 48" x 96" Ye 14" 32' minimum mirror when installed with contact cements. Twice the Over 48" x 96" 14" / " 4 3 long dimension Tape width is 1" 10 9 EFTA R1 01181050 EFTA02305985  MECHANICAL ATTACHMENT Panel size limits for Contact amnia SCREWS AND BOLTS Maximum long Temperature Plexiglas mirror may be easily drilled and attached dimension Variation to other surfaces using recommended screws and bolts. For decorative purposes Plexiglas mirror Up to 12" ±70° panels of 18" square and under may be attached with one fastener centrally located. Panels requir- Up to 24" *40° ing two or more fasteners should be provided with oversized holes in the Plexiglas mirror to allow Up to 38" *30° for thermal movement when they are to be at- *20° tached to non-plastic surfaces such as wood, Up to 48" masonry or metal. A minimum oversize for each Up to 72" *15° drilled hole is recommended in the table below in accordance with the size of the Plexiglas mirror Up to 96" *10° panel and the temperature range to which the panel will be exposed. Note: Do not mount Plexiglas mirror with tapes o adhesives where the mi ror is to be dismounted Oversize Hole Recommendations for Through-Bolting from the surface to which it is attached. Remove Plexiglas Mirror of the mirror from the mounting surface is mos likely to cause the separation of the reflective film Size of from the Plexiglas at the adhesion areas. Unde Plexiglas ± of Temp. Change such circumstances, mechanical mounting meth 40° 50° 60° A 10° 15° 20° 30° ods should be used. Use contact cement with minimum solvent attack. 12" Ms Vie Sis the Ks / 12 / 12 Those with strong solvent content will attack the Plexiglas mirror backcoat and reflective coating. 24" Me Ms Ms Mt Vs / 12 / 12 36° %a Sit Yu 34 V* 316 / 14 Contact C•111•M Sources 48" 6. 144 K / 4 3 34 Y4 14 Formica #140 Vs 14 14 Si 44 ii is sis Formica Corp. 60" Spring Grove Ave. 314 44 72" 14, ye / 4 3 / 4 3 14 Cincinnati, Ohio 45232 Armstrong 0220 84" Vi Vs Ms Ms 3Ss 31, Si Armstrong Cork Co. Lancaster, Pa. 96" Vii Vs 346 Xt ;16 Mii 102 Instant-Lok #41-4060 National Adhesives Division Through bolts or sc ews should be p aced 14 o National Starch and Chemical Company the way in from any edge to maintain maximum 7503rd Avenue, New York, N.Y. 10017 strength and minimum distortion. 12 11 EFTA_R1_01181051 EFTA02305986  The following are recommended screws and bolts FRAMING for mechanical attachment. The bolts and screws Plexiglas mirror may be framed using wood, metal should not be tightened but should be turned up or plastic frames. Wood or metal frames or the to the Plexiglas mirror surface then backed off Y4 placement of edge clips should be made oversize of a turn to allow for thermal movement. Counter- to allow for thermal movement of the Plexiglas sunk screws should not be used as they cause the mirror. The following chart provides a guide to Plexiglas mirror to crack. expansion allowance. Thermal and Humidity Expansion Allowances for Framed Plexiglas Mirror Long Dimension Possible Temp Change s Degree Slotted Phillips Panel 15° 20° 25° 30° 40° 50° 60° 12" Ms Ks Ms Ms Ms Ms Ms 24" YI6 316 Ms M6 M6 %to 14 / 36" Ms Ms Ms MG WS 12 / 12 / 48" %6 416 M6 MI 14 / 12 / 12 / 60" Ms 31s 34s Vs Vs $16 ,is 72" %is 34. % Ve Ws Ms Ks 84° Ms hi lb M % Ms M Socket Head Twelve Point Cap Screw Head Bolt 96. %, Ye 14 / Y. 3i, 14 114 Where op imum image reproduction is desired, the mechanical attachment methods described above should be used in conjunction with tapes and adhesives applied as directed for maximum flatness. OVERHEAD INSTALLATIONS Plexiglas mirror may be used in ceiling installa- tions where glass or other materials present an obvious hazard. Plexiglas mirror may be installed overhead by a number of recommended methods and with specific Plexiglas mirror panel size Hex Head Bolt Knurled Screw limitations. HORIZONTAL OVERHEAD INSTALLATIONS Plexiglas mirror should be mounted in ceiling in- stallations with edge-engaging frames such as tin T-bar system. Foam tapes and contact cements applied to the back surface of the mirror support the weight of the material in ceiling installations which could result in separation of the reflective film from the Plexiglas sheet. Ceiling installations of Plexiglas mirror should be of limited area because of the combustibility of the material. Consult local building codes for limitations. 13 14 EFTA_R1_01181052 EFTA02305987  FRAMING Hanging partitions and panels may be framed or The following table shows the average deflection unframed. cut to specific size and with drilled holes along the top edges approximately 1" from the of horizontal unsupported frames. edges for chain, wire or monofilament support. Two panels may be adhered back to back to obtain Ave age Deflection of Plexiglas Mirror a reflective appearance on both sides. / " Plexiglas Ye" Plexiglas 14 Edge mirror mirror Engagement IMAGE DISTORTION Plexiglas mirror is somewhat flexible and is subject Under to thermal expansion. Adequate panel thickness 18" x 18" Sie" Less than va. W" and proper Installation techniques can minimize 24" x 24" 3%." %en / " 12 visual distortion but cannot eliminate it entirely. For many applications, visual distortion may not 30" x 30" vie Vs" / " 12 be objectionable. 24" x 48° %e ye Iv, CLEANING PLEXIGLAS MIRROR 36" x 36" me V. 2%6- Plexiglas mirror should be cleaned by applying a Ime, spray wax such as Johnson's Pledge to the front 48" x 48" Vs" IKs" surface of the mirror and wiping with a soft cloth. 46" x 72" I y16" % re 1%6" BUILDING COOK CONSIDERATIONS We aer %Ss Itb ff qill. Plexiglas mirror is classified as a slow burning Three year data Panels moan ed horizontally a d unsuPPOzled plastic material with combustibility comparable With wood. The use of Plexiglas mirror is subject to the limitations applicable to combustible interior finish. VERTICAL OVERHEAD INSTALLATIONS Hanging panels or partitions of Plexiglas mirror Plexiglas minor can be cui, routed, drilled and easily paint can be functional and decorative for uses such decorated by silk screening 10 arnve al a dramatic graphic as backdrops or to partition space. The lightweight panel of Plexiglas mirror is primary advantage in these applications. 16 15 EFTA_R1_01181053 EFTA02305988