【正文】 alternatively, pigment can be added to the resin. With low conduction of heat, and the stability in fiberglass, it can also be painted in a variety of dark colors Cost. One downside of fiberglass windows has been the cost, with prices running 20 percent to 30 percent more than the average vinyl window A key factor here is the plicated pultrusion process, which is not as fast as the extrusion process used to fabricate vinyl or aluminum frames However, with fiberglass manufacturers incorporating advancements in pultrusion, die design, fabrication, and assembly, larger quantities of fiberglass are being produced faster, with a corresponding drop in prices. In addition, while upfront costs of a fiberglass window may be higher than other window types, because of their durability, fiberglass windows may be a better value over time. Reed College in Portland, Oregon, features TudorGothic architecture and a forested canyon wilderness preserve at its center. When the school39。 high condensation resistance helps keep humidity within a suitable range and limits the growth of mold and mildew. Low thermal transmittance. Fiberglass39。t crack from dryness, swell, peel or warp fiberglass is easy to install. Fiberglass windows remain square and level and resist warping and twisting during installation, a mon problem during installation with other types of windows. It is extremely hard and thus highly scratch, dent and impactresistant, and its strength is unaffected by time or temperature. Compatible thermal expansion. Because fiberglass frames are essentially glass fibers and resin, the frames expand and contract very little and at approximately the same rate as glass itself. If there is any expansion and contraction, the ponents expand and contract as a unit, unlike most window and door frames which have an interface of different materials: glass on wood, glass on aluminum or glass on vinyl. Aluminum is said to expand and contract three times as much as fiberglass and vinyl over seven times more. The minimal expansion and contraction of fiberglass puts less stress on the seals and frametoseal connection is maintained during temperature changes throughout the day and the seasons, thereby reducing the potential for air infiltration, a major cause of a building39。 Slim frames plement modern architectural styles Resists deterioration Longlasting, reliable operation s heat seeps out through the sash and frame. Better quality aluminum windows are now available, equipped with thermal breaks that separate the interior and exterior surfaces of the window to improve energy efficiency Aluminum39。 Costeffective .Easytoinstall Maintenancefree Durable s characteristics include t easily be painted, but are often available in white and various neutral colors that plement many design schemes. Because the color permeates the material, scratches and dings are nearly impossible to see. New technologies have enabled some vinyl window manufacturers to paint vinyl, however, they must choose from a limited color palette and have the correct paint formulation in order to prevent deformation of the vinyl due to heat buildup. Quality varies by manufacturer and position of the vinyl pound, which will dictate its performance over time. Each additive to a vinyl recipe helps determine the longterm characteristics of the final product, such as its weather and impact resistance。 Traditional look fits many home styles Available in custom colors and designs s total performance. Wood Wood is a readily available frame material, and the most mor choice for homes. Strong and easy to work with, wood is a natural insulator and plements many forms of traditional home architecture. It can either be painted a solid color or stained and sealed to show off the wood grain. Some significant downsides to wood windows have driven a switch to other frame materials.