How Does Tyvek Work?
If you know the unique properties of Tyvek, you can solve this doubt.
DoPont Tyvek gives anything you print a more distinctive look than paper ever could. It feels more natural than synthetic films, and has far better flat, precision folding qualities. It can even easily function as a fabric. Also DuPont Tyvek is strong and tear resistant, yet weighs only half as much as paper. Some of the unique properties of Tyvek are detailed here, and additional technical information is avaliable on www.dupont.com.
Tyvek has outstanding flexibility and exceeds 20,000 folding cycles when tasted on an MIT flex tester (TAPPI method T-423) without pre-scoring.
Tyvek can be recycled, helping you to reduce print waste. It can be processed at centers that recycle flexible HDPE products.
Under normal conditions, Tyvek remains neutral; elevated temperatures in excess of 220°F (104°C) can cause width loss and deformation.
Compared with most textile fabrics, the air permeability of Tyvek is low. Moisture vapor transmission is much higher than that of plasitc films and similar to that of coated papers.
The physical properties of Tyvek withstand the effects of water and meet British Standard 5609. Tyvek is equally strong wet or dry.
Tyvek has one of the highest opacity ratings in the printing industry, raging from 90-9840. FDA requirements Tyvek 1059B meets the requirements of Title 21 of the United States Code of Federal Regulations (21 CFR 177.1520) for direct food ontact applications where the temperatures do not exceed 212°F(100°C).
DuPont Tyvek is composed of continuous fibers, hence it does not generate a significant amount of lint particles.
Tyvek "B" grade has a netural pH of 7, which makes it excellent for archival uses because it does not have antistat or corona treatments. Tyvek is also lignin free.
Tyvek products are inert to most acids, based and salts. Prolonged exposure to oxidizing substances, such as concentrated nitric acid or sodium persulfate, can cause some loss of strength.
Tyvek and Tyvek Brillion are among the whitest materails available for printing with a TAPPI Standard Test Method rating of 94.1. The following values are typical for Tyvek:
L = 97.8 brightness (100 for perfect white)
a = 0.3 green component
b = 0.1 yellow component
w = 96.5 overall color acceptance
Tyvek is highly resistant to most solvents, however certain solvents used in some inks, paints, adhesives and coatings can cause swelling. In some cases, solvent distortion can be minimized by rapid evaporation or drying in an oven.
Mold and mildew resistance
Tyvek is mold and mildew resistant. It shows no degradation after being buried in soil for an extended period like paper products or coated synthetics.
Tyvek is UV resistant, depending on style, from six months to more than one year. Some physical properties will be reduced if exposed to UV for over one year. UV resistance can be improved with opaque coating or with UV inhibitors.
DuPont Tyvek resists soiling and absorption of oils and greases. Tyvek can be washed with a mild detergent. Heated drying is not recommended.
In some processing steps, Tyvek may generate static electricity unless treated with antistatic agents. However these agents typically have no effect on sheet strength.
Sheet dimensions change less than 0.01% between 0% and 100% relative humidity at constant temperature.
Toughness and flexibility are retained down to -100°F(-73°C). When exposed to heat, Tyvek begins to shrink at approximately 220°F(104°C) and melts at 275°F(135°C). Under web offset processing conditions, the web temperature should not exceed 175°F(79°C).
The flammability characteristics of Tyvek are similar to those of most synthetic fibers. Hard structure products are rated class"A" when tested in accordance with ASTM E84-89a, a test for flame and smoke development. Soft structure products are rated "Class 1 - Normal Flammability" by the Federal Flammable Fabrics Act for Clothing Textiles(16 CFR-1610). Please refer to the MSDS (Material safety data sheet) for additional information.
Solvent and adhesive compatibility testing
The compatibility of solvents in inks, coatings and adhesives can be tested by placing two to three drops on a sheet of the style being used. Additional information on solvent and adhesive compatibility is available on our website.
Tyvek in its orginal form has been tested for skin contact toxicity. No reports of toxic reactions have been received.
Spunbonded olefin is considered an "article" under provisions of the Toxic Substance Control Act (TSCA) and is considered nonhazardous under provisions of the Hazard Communication Standard. A complete MSDS is available on our website.
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