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GRAV is proud to be part of the scientific glass community and a tradition of glassblowing that is centuries old and still evolving. We encourage everyone to be curious and eager to learn. Our glossary helps to clarify some of the terms we use most often to talk about our products. If you'd like to better understand an aspect of glass blowing that isn't featured here, support@grav.com is ready to help.
  • WigWag

    WigWag glass is a style of glasswork that blends layers of colored glass, creating a striped, marble-like effect. WigWag pipes are so colorful they almost appear painted, and each pipe ends up looking slightly different from every other, even within pipes using the same colors. Many WigWag pipes use colors that are in dramatic contrast, such as orange, black, and bright purple. Because WigWag tubing requires multiple layers of glass, WigWag pipes are usually thicker and more durable than the average pipe.



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  • Scientific Glass

    Scientific glass is a genre of glass pipes. Most pipes can be labeled either scientific or heady, with a spectrum running between them (the more scientific, the less heady). Heady glass focuses on embellishments, using diverse and vibrant glass colors, eye-catching marbles, and glass structures on the outside of a pipe that don't contribute to the pipe's function. Heady pipes often take on recognizable forms, like an animal, a face, a robot, etc. Scientific glass focuses much more on function, largely through the use of percs. Scientific glass encompasses a large variety of percs applicable to a wide array of pipe formats. Scientific glass is usually clear, in part to reveal the inner mechanics of the pipe. This genre of pipes gets its name from the tradition of glasswork used in chemistry sets and medical devices. Most GRAV® products can be characterized as scientific.



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  • Sandblasted

    Sandblasting is a style of glasswork characterized by a matte, opaque finish, and a rougher texture than most glass. The finish is made by literally blasting the glass with sand using a blowing tool after the glass is shaped and cooled. The texture gives sandblasted pipes a pleasant handfeel, while the interior of the pipe is still smooth to avoid clogging with tar.



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  • Frit

    Frit glass is a style of glasswork that sandwiches coarse pieces of broken, colored glass ("frit") between layers of clear glass, creating an almost marble-like effect. Frit glass gives the appearance of having texture, while really being smooth to the touch. Because frit tubing requires multiple layers of glass, pipes made from frit are usually thicker and more durable than the average pipe.



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  • Bubble Trap

    Bubble Trap glass is a style of glasswork that traps air bubbles between layers of clear and colored glass, creating geometric patterns and giving the impression of depth and three-dimensionality. The bubbles are an intentional design feature and in no way diminish the integrity of the glass.



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  • Borosilicate

    Borosilicate is a type of glass that can tolerate shifts in temperature, making it perfect for building pipes. Because borosilicate doesn't expand as much as other glass types when heated, there's a very low risk of joints or accessories cracking when a flame is applied. All GRAV® glass is borosilicate with the exception of quartz nails and bangers.



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