Is there a such as a 4ft by 8ft 3/4 in sheet if plastic?

yeah, azek and or a product called clear you can order it from a mill shop or lumber yard. Its white





Edit I have used it for years.Is there a such as a 4ft by 8ft 3/4 in sheet if plastic?
Certainly, and through companies that specialize in Banks and other businesses that use security Acrylic.





Answer # 2 offers 2 links, and with all due respect, a general search in the WWW might offer dozens.





Without knowing at all your need, I think you should assume it will be pricey.Is there a such as a 4ft by 8ft 3/4 in sheet if plastic?
Probably plexiglass. Contact your area's glass company.
In all my years I've never seen it.
Tell us what you need it for then we can suggest something for the job.
What type of plastic? I know you can purchase 4x8ft 3/4in sheets of King Starboard a marine grade polymer. This and similar products like ';Sea Board'; are typically use in boat building. They are not transparent but do come in a variety of colors.





You can purchase clear Plexiglass in 4x8 sheets (check last link).