The density (specific gravity) of PMMA resin is an industry-recognized standard physical parameter. Commonly known as acrylic, it is a highly transparent amorphous engineering plastic with stable base density values tested in accordance with international standards such as ASTM D792 and ISO 1183.

Density varies slightly across different grades and modified types of PMMA, with all values being industry-recognized measured data:

General-purpose injection/extrusion grade PMMA: 1.18～1.20 g/cm³, typical value 1.19 g/cm³

High-impact PMMA: 1.17～1.19 g/cm³, with slightly lower density due to elastomer addition

Flame-retardant PMMA: 1.20～1.25 g/cm³, with halogen-free flame-retardant systems showing smaller density increases than halogenated systems

Inorganic-filled PMMA: 1.25～1.35 g/cm³, with higher filler ratios leading to greater density

Glass fiber-reinforced PMMA (10%～30% glass fiber): 1.30～1.45 g/cm³, with higher glass fiber content leading to greater density

This density parameter is a key reference for the design of optical lenses, daylighting panels, and decorative panels. Its stable density, combined with high transparency, makes it widely used in precision injection-molded optical parts, and density calculation is also fundamental for balancing optical performance and structural strength.