1.What's the difference between cast and extruded acrylic?
Acrylic is produced in two basic ways, cast and extruded. Cast acrylic is produced by mixing the acrylic liquid ingredients in mould. A chemical process in the mould creates a homogeneous material with equivalent properties in all directions. In contrast, extruded acrylic is produced by continuously pushing acrylic mass through a form, while the chemical process takes place.
Extruded acrylic is therefore heterogeneous, with properties which vary depending on the direction. We call it the extrusion direction for acrylic sheets.
When laser cutting extruded acrylic , there will become blurry on one side. On the cast acrylic there is not the case. The edges on extruded acrylic may look a bit different depending on the direction of the acrylic extrusion.
The Laser engraving will on extruded acrylic look matte Grey. On the cast acrylic will look matte white.
Heat bending and Thermoforming
A sheet of extruded acrylic could, because of the acrylic extrusion direction, behave differently depending on the bending direction relatively to the extrusion. With cast acrylic, it makes no difference.
When cast colour acrylic is heated for Thermoforming or heat bending the colour can change. Matte side can become clear and clear side can become matte. In addition, the shade of color can change. Cast acrylic is harder to bend / shape.
Cast acrylic is more scratch resistant than extruded acrylic.
Cast acrylic is harder to flame polish.
Cast acrylic is produced in many different colors and thicknesses. The colour selection is limited for extruded acrylic.
There is more tension in extruded acrylic.
2.Does acrylic discolour if left in the sun?
Most of the acrylic sheets sold by Alands are UV Stabilized otherwise stated as indoor use only (eg: acrylic mirror sheets). This means that with proper maintenance of the acrylic sheet, it should last 10 years or more before it ever yellows.
3.Is acrylic food safe?
Please be advised that clear cast acrylic sheets are in compliance with the FDA Food Additive Regulation 21CFR177.1010 ( Acrylic and Modified Acrylic Plastics, Semi-Rigid and Rigid ) for use in contact with all types of food except for high alcohol content foods (greater than 8% alcohol) at or below room temperature.
4.What is the best way to clean acrylic?
Acrylic sheeting can be damaged by harsh solvents and cleaners. Use a commercial plastic cleaner or mild soap and water to remove dirt and debris. When applying cleaner, use a non-abrasive lint-free or microfiber cloth that won’t scratch the surface. For tough grease, oil, or tar residue, use commercial grade hexane or kerosene. All solvents need to be wiped clean with fresh water and blotted dry to reduce and prevent water spotting.
When cleaning acrylic sheeting, never use ammonia, acetone, carbon tetra-chloride, or gasoline as a cleaning solution. These kinds of solvents can cause cracks in acrylic sheeting and give the surface a frosted appearance.
5. What about your quality guarantee for acrylic sheet?
1) The weight and thickness of each sheet is enough;
2) The surface is smooth, no scratch, no bubbles or spot on the whole sheet;
3) Clear sheet transparency reach to 93%, won't change yellow in 6-8 years;
4) Every acrylic sheets must be tested strictly to ensure no flaws before shipping;
5) If any quality problem, we promise refund the all your payment.