Volume 42, Issue 2 - February 2007
When replacing failed insulating glass units (IGUs), a concern to glaziers and their customers is how many more units may soon fail. On-site testing can be done inside or outdoors at any place on the glass to find the near-failure IGUs.
Jim Spetz Consulting of Wickliffe, Ohio, has developed handheld IGU testers that weigh less than a pound and single suction cup testers that weigh three pounds. According to information provided by the company, these testers are one-third the weight and a quarter of the cost of D-100 ASTM E-576 testers. The new testers come with instructions on their use and how to perform the tests, which are in the process of becoming an ASTM procedure. Jim Spetz explains that sealed IGUs have desiccated air space and the relative humidity in the air space is less than 0.01 percent. If the seal is breached the desiccant becomes fully loaded with moisture vapor and the relative humidity in the air space is 100 percent. The test is designed to get the 1-inch diameter area of the glass very cold. If the air space is dry, no moisture condenses inside the unit at the very cold spot. If there is a seal problem, a combination of ice crystals and water condenses inside the unit at the cold spot.
Commercial IGUs made with ¼-inch thick glass require a 5-minute test time. When using three suction cup-attached testers and a handheld tester on the fourth unit, users can average eight to ten sets of four units in an hour, according to Spetz. Test times should be doubled if the glass is laminated, Spetz adds.
Los Angeles-based C.R. Laurence Co. Inc. (CRL) announced that its 95C silicone building sealant has been approved for the Florida Hurricane Impact Glazing Code, and recommended as an installation sealant.
CRL 95C is a one part, neutral-cure silicone that cures to a durable and flexible silicone rubber building joint seal. It can accommodate +/- 50 percent joint movement in properly designed joints.
The sealant was tested successfully by window manufacturers using their systems, according to the company. In addition, CRL says it is an AAMA-verified component under AAMA 802.3-92 (type I and II), 805.2-94 (Group C) and 808.3-92. www.crlaurence.com
Vistawall Architectural Products of Terrell, Texas, developed the new TCR-250 thermal composite ribbon window system for projects with ribbon window openings demanding high energy-efficiency.
The zone-glazed system features glass-reinforced, polyamide insulating strip thermal breaks on all members. Along with continuous head and sill members, the system provides incidental water management at the head. It offers 2 ½- by 4 ½-inch framing for 1-inch glazing, with front-set, inside-glazed configurations.
The TCR-250 design is based on the Vistawall Reliance-TC™ curtainwall System chassis, which allows a seamless transition from curtainwall to ribbon window frames. www.vistawall.com
3M of St. Paul, Minn., offers a rear-projection window film for digital signage applications. The Vikuiti™ window rear projection film turns any clear surface into a rear-projection screen. The adhesive-backed film provides a vibrant, wide-viewing, ambient light-rejecting surface. The new product offers easy installation—no brackets, hanging wires or framing are required—and it may be cut to any shape or size. yyä www.3M.com/Vikuiti
Cardinal CG Co. of Minneapolis introduced a high-performance coated glass called Neat™ naturally clean glass, which it says can almost clean itself. The company says Neat uses the sun’s UV rays to loosen dirt so water can rinse it away, leaving windows easy to clean.
Neat glass is made through the use of the company’s patented double-sputtering process, through which an invisible, durable and permanent coating of silicon dioxide and titanium dioxide are applied to the glass. According to the company’s announcement, silicon dioxide makes Neat glass smoother than ordinary glass, so water disperses evenly, “sheets off” and evaporates quickly, reducing water spotting.
In addition, the titanium dioxide reacts chemically with the sun’s UV rays, causing organic materials on the glass to decompose. According to Cardinal, it works even on cloudy days, as 80 percent of UV radiation gets through cloud cover. Then when it rains, the decomposed dirt is rinsed away, leaving the glass almost spotless. www.cardinalcorp.com
The Glass Association of North America (GANA) released new Glass Information Bulletins aimed at providing technical information and education to the architectural fenestration industry. The bulletin, Marking and Labeling of Architectural Laminated Glass, was created to serve as an overview of the marking and labeling practices in use today for architectural laminated glass. It provides guidance and clarity to the various permanent marks or manufacturers designations currently being applied and/or required for the glazing infill of a fenestration assembly.
In addition, GANA also released the bulletin, Differences Between Safety Glazing Standards, which focuses on the differences in methodology between two safety glazing standards: CPSC 16 CFR Part 1201 and ANSI Z97.1. Specific topics addressed by the bulletin include application, test specimens, types of glass, asymmetrical glazing material, impact categories or levels, pass-fail impact criteria, labeling, certification, impact-testing apparatus, weathering tests, modulus and hardness tests and indoor aging tests. www.glasswebsite.com
equipment and machinery
Bystronic of Hauppauge, N.Y., now offers fully automatic vertical insulating glass manufacturing lines capable of processing all spacer systems currently available on the market. Offerings include first’insulate for conventional “box” spacers, first’TPS for thermoplastic (TPS™) spacers and first’flexspacer for flexible (SuperSpacer™) spacers. The company says these lines are designed in a strictly modular configuration, permitting different stages of automation.
For residential applications, Bystronic’s I.G. lines are configured to handle a maximum glass size of 63 by 98 inches. However, they may be supplied in other standard sizes including 90 and 106 inches high and more than 157 inches long. The company says increased productivity over conventional insulating glass manufacturing translates into production outputs of up to 1,200 units per shift.In addition, Bystronic offers the Easy-Lift series of single-column lifts, designed specifically for fast, safe handling of light loads. The basic Easy-Lift provides lifting, tilting and rotating functions with a safe working load of 330/551/771 pounds. For screenprinting or when handling other coated lites, the Easy-Lift Turnover Manipulator provides lifting and turnover of 96 degrees or 180 degrees, with a safe working load of 330/551 pounds. For lifting, tilting and manual turning in low-quantity operations, the Easy-Lift Mandy can safely accommodate small glass plates up to 220 pounds. www.bystronic.com
Azo-Brader™ Provides Mechanical Surface Conditioning of Extrusion Cavity
Azon’s 10-year warranty plan against polymer failure has been strengthened for all doors and windows produced with the patented Azo-Brader™ and its structural polymer system. The Azo-Brader is designed to provide mechanical surface conditioning of the extrusion cavity prior to the polymer pour and debridge process. The company says this ensures proper adhesion to difficult finishes. Regular testing procedures to validate polymer adhesion are implemented, monitored and reported using the company’s E-Quality Audit™.
The Azo-Brader is engineered for abrading all surfaces, including mill finish aluminum, gloss-enhanced and all-color, anodized finishes. www.azonintl.com
Terrell, Texas-based Naturalite Skylight Systems added the Versalean-to-Glass (VL2G) skylight to its line of pre-assembled, pre-glazed products.
The VL2G is a lean-to product that can be installed from a vertical wall to a curb. It uses a split rafter to conceal the unit’s expansion joints and allows the skylight to be completely shop-glazed for quality control. www.vistawall.com