When global buyers look at “TR frames” on a sourcing sheet, they see a single two-letter abbreviation. They expect the classic promise: light, flexible, nearly unbreakable. But in the manufacturing lines of Wenzhou, that two-letter word covers a massive spectrum of quality, chemical engineering, and—most importantly—hidden cost models.
If you’ve ever wondered why one factory quotes $1.50 for a TR frame while another quotes $4.50, the answer isn’t just factory margin. It lies in the material hopper.
Specifying “TR-90” without defining the brand, grade, or virgin purity is like ordering “stainless steel” without a grade number. You might get export-quality eyewear. Or you might get brittle, cloudy retail returns. This guide pulls back the curtain on TR pricing and explains how we manage these materials at Wenzhouframe.
The TR Cost Spectrum: From Recycled Scrap to Premium Chains
To understand where your money goes, you have to look at the raw cost of the plastics entering the injection molding machines.
+-------------------------------------------------------------------------+
| MATERIAL GRADE | PRICE RANGE | TYPICAL APPLICATION |
+------------------------+--------------+---------------------------------+
| Recycled / Regrind | Under ¥15/kg | Ultra-cheap promotional giveaways|
| Domestic Chinese TR | ¥20 – ¥35/kg | Volume e-commerce, dark opaque |
| EASTMAN Tenite™ (USA) | ¥45 – ¥60/kg | Wenzhouframe Standard (Premium) |
| EMS / Evonik (Euro) | ¥80 – ¥120+/kg| Custom specialty/high-end spec |
+-------------------------------------------------------------------------+
1. The Bottom Tier: Recycled & Regrind Materials (The Hidden Risk)
The cheapest TR frames on the market—the ones driving sub-$1.50 wholesale price points—frequently rely on recycled scrap or “regrind” (回收料/水口料).
-
The Reality: When a factory injects plastic, the leftover runners and failed frames are ground back into pellets. Rogue or ultra-low-cost factories mix high percentages of this regrind back into the machine to slash costs below ¥15/kg.
-
The Consequence: Every time TR is reheated and re-injected, its polymer chains break down. The material loses its molecular memory. At retail, these frames are a ticking time bomb—they are brittle, crack easily under cold weather, warp over time, and suffer from massive batch-to-batch color inconsistency.
2. The Volume Standard: Domestic Chinese TR Resin (¥20 – ¥35 / kg)
The vast majority of fast-fashion and basic online retail TR frames are made from domestic Chinese TR resin.
-
Where it works: For dark, opaque solid colors (solid black, dark tortoise, navy), domestic virgin TR is a perfectly defensive, cost-effective choice. The dark pigment masks the slightly lower optical purity of the base resin, and the mechanical performance is sufficient for standard, thick-walled frame shapes.
-
Where it fails: If you try to use domestic TR for clear, crystal, champagne, or soft jelly colorways, the frame will look noticeably murky, yellowish, or hazy. It lacks the high-end optical luminosity required for premium private labels.
The Wenzhouframe Baseline: United States EASTMAN Tenite™
At Wenzhouframe, we refuse to compete in the race to the bottom with unstable recycled scraps or low-grade resins. To protect our buyers’ brand reputation, our primary production standard relies on imported American EASTMAN Plastics (Tenite™ Propionate / CAP).
By positioning EASTMAN as our baseline material, we solve the two biggest headaches in TR sourcing:
Why EASTMAN Bridges the Gap Perfectly:
-
The “Acetate Look” at an Injection Price Point: Traditional acetate requires expensive CNC milling and material waste. EASTMAN’s propionate resin is an injection-molded cellulosic plastic. It delivers the exact visual depth, high gloss, and warm, premium tactile feel of thick-cut acetate, but with the production efficiency and lightweight comfort of an injection mold.
-
True Optical Clarity: Unlike domestic TR which turns murky in light shades, EASTMAN clear transparent grades (
Clear Trsp) allow us to produce stunning, crystal-clear jelly, blush, and amber frames that look premium under retail lighting. -
Mid-Tier Cost Efficiency (¥45 – ¥60 / kg): It represents the ultimate sweet spot. It is vastly superior to domestic TR, yet more cost-effective than European specialty nylons, allowing our clients to capture high retail margins without paying extreme raw material premiums.
For Specialty Demands: Custom Brand Specifications
While EASTMAN is our default workhorse, we recognize that high-performance, sports, or high-luxury collections require specialized engineering. If your brand brief or purchase order specifies it, we can explicitly source premium European and Japanese resins:
-
EMS-Grivory (Switzerland) Grilamid Series: * TR-90 FL: For the ultimate, crystal-clear transparency that rivals glass.
-
TR-90 UV: Essential for tropical markets or long sea transit to prevent yellowing.
-
TR-90 NZZ: Super-tough, cold-impact grade engineered for ski goggles, sports wrap-arounds, and children’s unbreakable eyewear.
-
-
Evonik (Germany) Trogamid CX7323: The gold standard for chemical resistance. It eliminates stress-cracking caused by everyday exposure to cosmetics, hairsprays, and alcohol-based facial wipes.
-
Arkema (France) Rilsan Clear: Bio-based, eco-friendly castor-oil-derived nylons for brands requiring verifiable ESG and sustainability marketing certifications.
Summary: How to Control Your Quality at Wenzhouframe
When you source from Wenzhouframe, you are paying for transparency, material traceability, and predictable retail performance. Here is how we recommend structuring your project requirements:
-
Running basic black or solid dark frames? Let us utilize high-grade, virgin domestic TR or our EASTMAN baseline to optimize your unit costs.
-
Developing crystal, jelly, or premium color collections? Benefit from our standard EASTMAN Tenite™ setup for an immediate lift in visual value.
-
Targeting extreme environments or green marketing? Instruct us to lock in EMS NZZ or Arkema Bio-based resins in the pre-production quote.
Don’t let a cheap quote fool you into buying recycled scrap that snaps in your customer’s hands. Contact the Wenzhouframe team with your design brief today, and let’s match the exact resin grade to your retail price target.
