{"id":2811,"date":"2026-07-31T17:18:14","date_gmt":"2026-07-31T09:18:14","guid":{"rendered":"https:\/\/www.jcinjectionmolding.com\/?p=2811"},"modified":"2026-07-31T17:24:59","modified_gmt":"2026-07-31T09:24:59","slug":"pmma-acrylic","status":"publish","type":"material","link":"https:\/\/www.jcinjectionmolding.com\/fr\/materials\/pmma-acrylic\/","title":{"rendered":"PMMA(Acrylic)"},"content":{"rendered":"
\n

<\/p>\n

\n

Common PMMA \/ Acrylic Grades We Mold<\/h2>\n

We process high-purity Acrylic polymers from globally recognized synthesizers, optimized for optical clarity, high surface hardness, and outdoor UV resistance:<\/p>\n\n\n\n\n\n\n\n
PMMA Grade Class<\/th>\nTypical Brand & Grade<\/th>\nKey Characteristics & Advantages<\/th>\n<\/tr>\n<\/thead>\n
Optical & High Flow PMMA<\/td>\n\u2022 R\u00f6hm PLEXIGLAS 8N \/ 8H
\n\u2022 Sumitomo SUMIPEX MH \/ MG<\/td>\n		Exceptional light transmittance (92%), ultra-low haze, and easy melt flow. Ideal for thick-walled automotive light pipes, optical lenses, and LED diffusers.<\/td>\n<\/tr>\n
High Heat PMMA<\/td>\n\u2022 R\u00f6hm PLEXIGLAS 7N
\n\u2022 Arkema Altuglas HT121<\/td>\n		Elevated Vicat softening point (up to 110\u00b0C) and superior scratch resistance (M-Scale 100). Specified for automotive tail lamp covers and high-temperature lighting bezels.<\/td>\n<\/tr>\n
Impact-Modified PMMA<\/td>\n\u2022 Evonik PLEXIGLAS Resist zk6
\n\u2022 Chi Mei ACRYREX VH4<\/td>\n		Toughened with acrylic elastomer domains to offer 3x to 5x higher impact resistance than standard PMMA, while maintaining high transparency for display covers.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n

<\/p>\n

\n

Applicable Molding Processes for PMMA (Acrylic)<\/h2>\n

PMMA’s high melt viscosity and amorphous optical sensitivity require strict injection parameter controls:<\/p>\n\n\n\n\n\n\n\n
Molding Process<\/th>\nProcess Suitability & Application Details<\/th>\n<\/tr>\n<\/thead>\n
Optical & Lens Molding<\/td>\nExcellent. Highly optimized for spherical lenses, light guides, LED reflectors, and optical prisms requiring zero light scattering and low birefringence.<\/td>\n<\/tr>\n
Thin-Wall Cosmetic Packaging<\/td>\nExcellent. Produces luxury thick-walled cosmetic jars, perfume caps, and display boxes with crystal-like brilliance and scratch resistance.<\/td>\n<\/tr>\n
2K \/ Overmolding<\/td>\nGood. Extensively used in 2K multi-shot molding to co-inject clear PMMA over red or amber ABS\/PC substrates for multi-colored automotive tail lamps.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n

<\/p>\n

\n

PMMA (Acrylic) Tooling & Optical Strain Control Guide<\/h2>\n

Molding an optical-grade amorphous thermoplastic like Acrylic demands precise temperature control and mirror-polished tool cavities:<\/p>\n

    \n
  • SPI A-1 Mirror Mold Polishing:<\/strong> Any microscopic surface scratch or pit on tool cavity walls will scatter light and degrade transparency. Jucheng\u2019s tooling division uses premium S136 stainless steel hardened to 50 HRC, diamond-polished to an SPI A-1 mirror finish.<\/li>\n
  • Eliminating Optical Strain & Birefringence:<\/strong> High shear stress during injection creates internal molecular orientation, resulting in rainbow refraction lines (birefringence). We employ slow-to-moderate injection speeds, large gate channels, and progressive packing pressures to ensure low residual stress.<\/li>\n
  • Desiccant Pre-Drying Protocol:<\/strong> PMMA is moderately hygroscopic. Moisture causes severe silver streaks, bubbles, and loss of clarity. Raw material is strictly dried in desiccant dryers at 80\u00b0C\u201390\u00b0C (176\u00b0F\u2013194\u00b0F) for 3\u20134 hours, maintaining moisture levels under 0.02%.<\/li>\n
  • Low Amorphous Shrinkage:<\/strong> PMMA features low and uniform shrinkage (0.4% to 0.7%). Our 5-axis CNC machining center cuts precise tool cavities with conformal cooling loops to speed up cycle times without thermal distortion.<\/li>\n<\/ul>\n<\/section>\n

    <\/p>\n

    \n

    Key Application Industries for PMMA Molded Parts<\/h2>\n
      \n
    • Automotive Lighting & Optics (IATF 16949 Compliant):<\/strong> Tail lamp covers, ambient light pipes, instrument cluster covers, indicator lenses, and HUD display plates.<\/li>\n
    • Luxury Cosmetic & Retail Packaging:<\/strong> Thick-walled cosmetic jars, luxury perfume bottle caps, crystal-clear display boxes, and high-gloss compact cases.<\/li>\n
    • Medical & Diagnostic Devices (ISO 13485 Compliant):<\/strong> Optical diagnostic cuvettes, blood inspection chambers, light-guiding sensor housings, and laboratory fluidic wells.<\/li>\n<\/ul>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"

      Common PMMA \/ Acrylic Grades We Mold We process high-purity Acrylic polymers from globally recognized synthesizers, optimized for optical clarity, high surface hardness, and outdoor UV resistance: PMMA Grade Class Typical Brand & Grade Key Characteristics & Advantages Optical & High Flow PMMA \u2022 R\u00f6hm PLEXIGLAS 8N \/ 8H \u2022 Sumitomo SUMIPEX MH \/ MG […]<\/p>\n","protected":false},"featured_media":2812,"template":"","meta":[],"material_type":[21],"application_feature":[],"machining_process":[],"class_list":["post-2811","material","type-material","status-publish","has-post-thumbnail","hentry","material_type-engineering-plastics"],"_links":{"self":[{"href":"https:\/\/www.jcinjectionmolding.com\/fr\/wp-json\/wp\/v2\/material\/2811","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jcinjectionmolding.com\/fr\/wp-json\/wp\/v2\/material"}],"about":[{"href":"https:\/\/www.jcinjectionmolding.com\/fr\/wp-json\/wp\/v2\/types\/material"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/fr\/wp-json\/wp\/v2\/media\/2812"}],"wp:attachment":[{"href":"https:\/\/www.jcinjectionmolding.com\/fr\/wp-json\/wp\/v2\/media?parent=2811"}],"wp:term":[{"taxonomy":"material_type","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/fr\/wp-json\/wp\/v2\/material_type?post=2811"},{"taxonomy":"application_feature","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/fr\/wp-json\/wp\/v2\/application_feature?post=2811"},{"taxonomy":"machining_process","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/fr\/wp-json\/wp\/v2\/machining_process?post=2811"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}