Acrylic (PMMA) Injection Molding

Acrylic plastic molding delivers crystal-clear, durable parts with excellent optical properties. Whether for lighting, displays, or automotive components, our precision molding ensures high-quality results for your applications.

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Erye Offer Acrylic Injection Molding Service Specific to Your Needs!

Acrylic (PMMA) injection molding is ideal for producing transparent, impact-resistant parts with excellent weatherability. From optical lenses to display panels, our advanced Acrylic molding capabilities ensure clarity and precision. With a deep understanding of acrylic’s unique properties, we optimize every stage of production to achieve flawless results.

Ultra-high transparency for optical-grade, distortion-free parts
Tight tolerances to maintain clarity and consistent visual accuracy
High-volume molding with stable, repeatable quality
Custom surface finishes including glossy, matte, and fine textures
Optional UV and impact-resistant enhancements for improved durability
Post-processing support such as bonding, coating, and light assembly

Acrylic Injection Molding Services

Service	Details
Maximum Part Size	2500mm x 2000mm (98 in. x 78 in.)
Recommended Wall Thickness	0.89 mm and 3.81 mm(0.035 to 0.150 inches)
Color Options	Any color according to RAL or Pantone Code
Standard Finishes	SPI and VDI
Mold Ownership	Customer owned with mold maintenance
Mold Life	Unlimited (If the acrylic injection mold worn out, Erye will cover the cost of new mold)

Injection Molded Acrylic Design Guide

Injection molding PMMA (Acrylic) Part design must account for PMMA's properties, particularly its transparency and flow limitations.

Item	Description
Rib Design	Ribs should be about 60% of wall thickness to enhance part strength, with a slight draft angle to allow easy removal from the mold.
Boss Design	Design bosses with a diameter 2-3 times the screw diameter and a wall thickness 60% of the main wall to prevent sink marks, considering PMMA's shrinkage rate of 0.2-1%.
Snap-Fit Design	Use short, wide snap-fit cantilevers with generous radii, as PMMA's elongation at break is generally between 2-5%.
Hole Design	Maintain a minimum distance of 1.5 times the hole diameter from the edge to prevent cracking.
Wall Thickness Transitions	Use a 3:1 transition ratio to minimize stress concentrations, as abrupt changes affect PMMA's uniform cooling and shrinkage.
Tolerance	Commercial tolerances are 0.1 to 0.325 mm for parts under 160 mm, while fine tolerances (0.045 to 0.145 mm) suit smaller parts (≤100 mm).
Assembly Considerations	Design features for assembly, accounting for PMMA's thermal expansion and potential for stress cracking during joining.

Start PMMA Injection Molding Project

Get high-quality Acrylic injection molded parts! Contact with Erye to request a quote!

Advantages of Acrylic Molding

Exceptional Optical Clarity

PMMA boasts a light transmission of around 92%, rivaling glass, making it ideal for lenses and optical components.

High Gloss Finish

Achieves a high-gloss surface finish with a haze value typically below 1%, replicating mold details with excellent fidelity.

Excellent Colorability

Can be easily colored or tinted, maintaining high transparency with light transmission often exceeding 85% in colored grades.

Good UV Resistance

Some grades exhibit high UV resistance with less than 10% light transmission loss after 500 hours of UV exposure.

High Rigidity

Offers a flexural modulus of around 3.3 GPa, providing good rigidity and dimensional stability.

Disadvantages of Acrylic Molding

Lower Impact Strength

Standard PMMA has relatively low impact resistance, typically around 15–20 kJ/m², making it more brittle compared to materials like polycarbonate.

Poor Chemical Resistance

PMMA is sensitive to many solvents and chemicals such as alcohols, ketones, and hydrocarbons, which can cause crazing, cracking, or surface whitening.

Higher Risk of Stress Cracking

Its rigid molecular structure makes PMMA more prone to stress cracking under load, especially when exposed to environmental stressors or improper molding conditions.

Lower Scratch Resistance Without Coating

Although stiffer than many plastics, uncoated PMMA can scratch relatively easily, often showing surface marks from abrasion or handling.

Injection Molding Acrylic Applications

Automotive Industry

Tail light lenses
Headlight lenses
Instrument panel covers
Interior light diffusers
Navigation screen covers

Consumer Electronics

Display screens
LED light diffusers
Light guides
Touch panel overlays
Optical lenses

Medical & Healthcare

Diagnostic device housings
Medical instrument lenses
Fluid connectors
Surgical light diffusers
Incubator covers

Lighting Industry

LED light covers
Diffuser panels
Streetlight lenses

Additonal Options for Acrylic Parts

Case Study

Case Study of Automotive Glove Box Development

Learn how to help a customer move from an early glove box concept to a fully tooled, production-ready part. This case shows how we designed the mold, optimized the tooling, and reached reliable mass production.