Solvent Dyes in Action: PET Fiber, Cosmetics & Auto Lighting
The value of solvent dyes goes far beyond "nice colors." As colorants that truly dissolve into the resin system, they enable transparent engineering plastics to be colored with both high transparency and high saturation — which is why they hold their ground across industries that are demanding about both appearance and performance. Aolong's solvent dye series has been shipped in volume to export manufacturing customers across these scenarios. Let's walk through the main application landscape of solvent dyes.
I. PET Spinning & Blow Molding: A Heat-Resistant "Color Engine"
PET spinning runs at high processing temperatures with short residence times, placing strict demands on a dye's heat resistance and solubility. Thanks to their outstanding heat resistance, solvent dyes are the workhorse for coloring polyester (PET) fiber spinning and blow molding — and one of the largest application directions in Aolong's solvent dye sales volume.
Colorful PET yarn winding colored with solvent dyes in a spinning workshop
Colorful yarn winding in a PET spinning workshop — vivid, even and consistent.
Recommended grades (high melting point, excellent heat resistance):
- Solvent Red 135 (SR 135): 318°C melting point, first choice for PET spinning and blow molding, high color fastness
- Solvent Yellow 114 (SY 114): 300°C heat resistance, greenish yellow, general purpose for spinning
- Solvent Blue 45 (SB 45): reddish blue, highly recommended for spinning and blow molding
- Solvent Orange 63 (SO 63): fluorescent reddish orange, 320°C melting point, PET/Nylon 6 spinning
Typical dosage in spinning is 0.1%–1.0%, adjusted by target shade depth and filament diameter. Spinning dyes require special attention to melting point and stability under screw shear; Aolong can provide corresponding process parameter advice.
II. Cosmetics Packaging: The "Face" of High-Transparency Plastics
Cosmetics packaging frequently uses transparent plastics such as PMMA, PET and PS. The high transparency + high gloss of solvent dyes give bottles a crystal-clear texture, making them a favored coloring solution for premium beauty packaging. For brands, consistent batch color means lower scrap rates and better shelf consistency.
Transparent cosmetics packaging bottles colored with solvent dyes
Transparent cosmetics packaging bottles and jars colored with solvent dyes — clear and premium.
Recommended grades:
- Solvent Red 135 (SR 135): classic red, a packaging staple
- Solvent Yellow 114 (SY 114): bright yellow, for accents and contrasts
- Solvent Blue 67 (SB 67): greenish blue, fresh and transparent
- Solvent Violet 13 (SV 13): bluish violet, an elegant tone
For cosmetics packaging, always monitor migration and relevant regulations (food-contact and cosmetics-contact material standards). Aolong can provide compliance evaluation and formulation support.
III. Automotive Lighting & Optical Parts: Stable Color in Demanding Conditions
Automotive tail lights, turn-signal lenses and signal lamp housings are exposed to high heat, UV and temperature swings over long periods. Solvent dyes must deliver heat resistance, weather resistance and high light transmission at the same time to keep the hue stable and optical performance intact — hard metrics that are repeatedly verified in optical applications.
Transparently colored automotive lighting lenses and lamp components
Transparently colored automotive lighting lenses and lamp components — stable color in harsh environments.
Recommended grades (high heat resistance + high light fastness):
- Solvent Red 135 (SR 135): tail-light red, 318°C heat resistance
- Solvent Orange 63 (SO 63): turn-signal orange, striking fluorescent effect
- Solvent Violet 59 (SV 59): meets long-term outdoor application requirements
Automotive lighting demands high light fastness (typically Grade 7-8). Aolong can advise on grade selection based on the specific component and OEM requirements.
IV. Backlit Panels & Signage: Making Colors "Glow"
Light boxes, light guides, backlit signage and consumer-electronics light guides all need colors to stay saturated even when backlit. Because solvent dyes dissolve at the molecular level, they avoid the haze caused by light scattering, delivering purer and brighter backlight effects.
Transparent colored panels glowing under backlight
Transparent colored panels under backlight — full and bright color.
Recommended grades:
- Solvent Yellow 114 (SY 114), Solvent Yellow 98 (SY 98): fluorescent yellow, high brightness
- Solvent Blue 67 (SB 67): transparent blue
- Solvent Green 3 (SG 3), Solvent Green 5 (SG 5): greens; SG 5 offers a fluorescent effect
V. Why More Factories Choose Aolong Solvent Dyes
✅ Six color series, 30+ specifications: Red, Yellow, Blue, Green, Orange, Violet — high color matching freedom
✅ Melting points from 189°C to 320°C: match different resins and processing temperatures
✅ Light fastness up to Grade 7-8 (1/3 standard depth): meets long-term outdoor and premium applications
✅ Even dissolution, low batch variation: stable mass production, fewer rejects
✅ B2B export friendly: bilingual technical support in Chinese and English, flexible CIF / FOB delivery
✅ Free samples + custom formulations: effective at 0.05%–2.0% dosage
Not sure where to start? Read our solvent dyes selection guide or the full series product launch announcement.
📞 Contact Us
Need free samples, technical documentation, quotations or custom color matching? Contact our sales team or reach us through the following channels:
- Company Name: Aolong Chemical Co., Ltd.
- Email: sales@aolongchemical.com
- Phone: +86 571 86690377
- Website: www.aolongchemical.com
- Address: No. 1788 Jinggang Road, Shushan District, Hefei, Anhui Province, China
Aolong Chemical, focusing on thermochromic technology, illuminating the future of functional materials with "color"!