This is a 650mm-thick acrylic sheet. Even through such substantial acrylic, visibility remains exceptionally clear. Our acrylic boasts a light transmission rate of up to 93% and effectively maintains its shape and color for 30 years without yellowing. It offers strong compressive strength, durability, and resilience. We welcome you to visit our factory for inspection. Qiankai Marine Engineering specializes in the production and customization of large-scale acrylic sheets.
In the field of thick acrylic sheet engineering, there is a persistent challenge: the thicker the sheet, the more prone it is to issues such as cloudiness, yellowing, impurity buildup, and light scattering distortion. Once standard thick acrylic sheets on the market exceed 300 millimeters in thickness, most suffer from a sharp drop in transparency, color cast, and visual blurring, making it difficult to meet the high standards required for ultra-large deep-sea viewing windows, giant aquarium viewing panels, and ultra-deep-water special engineering projects. However, the 650-millimeter ultra-thick acrylic sheets independently researched and manufactured by Shanghai Qiankai Marine Engineering Co., Ltd. have completely shattered the industry’s “curse” that “thick sheets must be opaque.” With their exceptionally pure optical quality, they achieve the dual goals of ultra-great thickness and ultra-high transparency, representing the pinnacle of domestic ultra-thick acrylic manufacturing.
I. 650-mm Ultra-Thick Sheets: A Revolutionary Level of Purity and Transparency That Defies Industry Conventions
Conventional wisdom holds that thick, heavy materials inevitably sacrifice light transmission, but Qiankai’s 650-mm acrylic sheets demonstrate a completely different optical performance. The sheets are cast as a single piece using high-purity imported MMA raw materials and undergo multiple stages of purification, degassing, curing, and precision polishing. Their internal molecular structure is highly uniform and dense, free of bubbles, impurities, delamination, and crystalline spots, eliminating at the source the haze and light distortion commonly found in thick sheets. Even at the extreme thickness of 65 centimeters, the overall light transmittance remains consistently above 92%, rivaling optical-grade transparency standards.
When viewing scenery through the entire ultra-thick sheet, the most striking visual features are zero color shift, zero distortion, and zero haze. When viewing deep water through standard thick acrylic, the image often appears bluish, objects may appear stretched, and edges may be blurred. In contrast, the Qiankai 650mm ultra-thick sheet offers exceptionally stable optical performance; as light passes through the thick panel, there is no chaotic scattering or refractive shift. Whether viewing deep-water environments, marine life, or external landscapes, colors are reproduced with true-to-life saturation and the image remains clear and three-dimensional. The entire sheet resembles a giant crystal or glass pane—heavy yet not dull, substantial yet transparent—completely redefining the upper limits of visual quality for ultra-thick engineering sheets.
Unlike the spliced and layered thick panels commonly found on the market, Qiankai’s 650mm acrylic panel features a one-piece molded structure. The surface is flawlessly flat, with no seams or sanding marks, and maintains uniform transparency throughout. Upon close inspection, there are no noticeable variations in brightness or color, nor any hazy shadows; from a distance, the view remains clean and pure. It is perfectly suited for top-tier aquatic landscapes and deep-sea projects requiring an expansive field of view and high aesthetic standards, delivering a premium, translucent quality that standard-thickness panels simply cannot match.
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