STYRON 685D: specs and equivalent grades
AmSty high heat crystal (general purpose) polystyrene for foam, OPS sheet and medical parts, sold in North America. Published data, grades from other producers to ask about, and how to request a quote from one gaylord.
Request a QuoteThe short answer
STYRON 685D is a high heat, high tensile strength crystal polystyrene (GPPS) with a blue tint, sold in North America by Americas Styrenics (AmSty) for foam, oriented polystyrene (OPS) sheet and medical uses. Published melt flow is 1.5 g/10 min, measured at 200°C / 392°F, 5 kg, ASTM D1238; specific gravity is 1.04 (ASTM D792) and Vicat softening temperature is 108°C / 227°F (ASTM D1525). STYRON is a Trinseo trademark; AmSty is a 50/50 venture of Trinseo and Chevron Phillips Chemical, and Trinseo has been in Chapter 11 since May 26, 2026 (it expects to exit in the first half of 2027) while AmSty keeps selling the grade. Grades from other producers to ask about include TotalEnergies Polystyrene 595T and 535B. They are not identical, so compare the data sheets and run a trial before switching.
Also written as: STYRON™ 685D. AmSty also sells STYRON 685C, 685DL, 685DR and 685P; those are separate grades with their own sheets, not color codes of 685D. Quote the full code from your drawing or bag label.
Buying STYRON 685D: one gaylord to a railcar · supplier COA on every prime lot · ships from 22+ partner warehouse locations · a polymer chemist checks the grade code before we quote · we aim to quote within one to three business days
Have a part number or drawing callout?
Paste it as written. A polymer chemist will tell you which grade it calls for, suggest equivalents and quote it by email.
STYRON 685D specs from the data sheet
Typical values from AmSty's STYRON 685D product information sheet (North America, March 2026). Typical values are not specifications; the lot COA shows what you actually receive. Values only compare at the same test method and condition.
| Property | Value | Test method or note |
|---|---|---|
| Producer (seller) | Americas Styrenics (AmSty); STYRON is a Trinseo trademark | AmSty data sheet, March 2026 |
| Polymer | High heat crystal polystyrene (GPPS), blue tint | |
| Availability | North America | Data sheet |
| Melt flow | 1.5 g/10 min | 200°C / 392°F, 5 kg, ASTM D1238 |
| Specific gravity | 1.04 | ASTM D792 |
| Tensile strength | 52 MPa (7,600 psi) | ASTM D638, injection molded |
| Tensile rupture | 52 MPa (7,500 psi) | ASTM D638 |
| Elongation | 3 % | ASTM D638 |
| Tensile modulus | 3172 MPa (460,000 psi) | ASTM D638 |
| Flexural strength | 90 MPa (13,000 psi) | ASTM D790 |
| Flexural modulus | 3240 MPa (470,000 psi) | ASTM D790 |
| Izod impact at 23°C | 21 J/m (0.4 ft-lb/in) | ASTM D256 |
| HDT at 1.8 MPa (264 psi) | 89°C / 192°F | ASTM D648 |
| HDT at 0.45 MPa (66 psi) | 98°C / 209°F | ASTM D648 |
| Vicat softening temperature | 108°C / 227°F | ASTM D1525 |
| Rockwell hardness | L 107 | ASTM D785 |
| Coefficient of linear thermal expansion | 9 × 10−5 cm/cm/°C | ASTM D696 |
| Mold shrinkage | 0.004–0.008 in/in | ASTM D955 |
| Flammability | UL 94 HB | UL file E326906 |
| Food contact and medical | Complies with FDA 21 CFR 177.1640 when used unmodified; USP Class VI. AmSty restricts long-term implant, cardiac and life-sustaining medical uses. | Data sheet footnotes |
| Injection molding temperatures | Nozzle and zone 1: 230–245°C / 445–470°F; zone 2: 215–230°C; zone 3: 200–215°C; back pressure 2–15 bar | Typical processing conditions on the data sheet |
| Mold temperature | 60–150°F (about 16–66°C) mold surface | Data sheet recommendation for polystyrene |
| Sheet extrusion | Melt 193–232°C / 380–450°F; die 199–232°C; polish rolls 66–104°C / 150–220°F | Typical extruder settings on the data sheet |
| Drying | Not published on the data sheet | AmSty data sheet, March 2026 |
Source data sheets are listed at the bottom of this page. Confirm against the current sheet for your exact grade code and color.
The producer's sheet gives no drying step. Crystal polystyrene takes up little moisture, but if parts show silver streaks or splay, dry the resin or check for condensation on material brought in from a cold warehouse.
Grades to ask about instead of STYRON 685D
These grades from other producers have similar published specs. None is a drop-in replacement: additive packages, flow at molding shear rates, color and approvals differ. If your part, drawing or customer approval names STYRON 685D, any change needs your approval and usually a trial.
| Grade | Producer | Melt flow | Density | Key property | How it compares |
|---|---|---|---|---|---|
| TotalEnergies Polystyrene 595T | TotalEnergies | 1.6 g/10 min (200°C / 392°F, 5 kg, ASTM D1238) | 1.04 g/cm³ | Vicat 225°F / 107°C (ASTM D1525); flexural modulus 490,000 psi (ASTM D790); tensile 7,700 psi (ASTM D638); HDT annealed 211°F / 99°C (ASTM D648) | Close match on flow and heat. High molecular weight, high heat crystal PS made in the U.S., designed for direct injection foam with higher melt strength; listed for foam disposables, foam board and OPS disposables. TotalEnergies states FDA 21 CFR 177.1640. Sheet revised February 2026. Quote this alternative › |
| TotalEnergies Polystyrene 535B | TotalEnergies | 4.0 g/10 min (200°C / 392°F, 5 kg, ASTM D1238) | 1.04 g/cm³ | Vicat 222°F / 106°C (ASTM D1525); flexural modulus 450,000 psi (ASTM D790); tensile 7,400 psi (ASTM D638); blue tint | Partial match. High heat, blue tint crystal PS made in the U.S. for injection molding, extrusion and blow molding (electronics packaging, cutlery, office accessories, medical, appliance components). TotalEnergies lists FDA 21 CFR 177.1640, USP Class VI and UL 94 HB (file E55470); the product page adds DMF listed. Higher flow than 685D, so it suits molding better than foam or OPS extrusion. Sheet revised February 2026. Quote this alternative › |
From each producer’s published data. Brand owners and grade names change; confirm on the current data sheet.
Typical uses for STYRON 685D
From AmSty's STYRON 685D data sheet:
- Foam
- Oriented polystyrene (OPS) sheet
- Medical parts (with AmSty's medical use restrictions)
What to check before you switch
- 685D has a blue tint. If you need water-white parts, check the color of any alternative (535B is also blue tint; 595T's sheet does not state tint).
- For foam lines, melt strength matters as much as melt flow; TotalEnergies says 595T has higher melt strength than other high heat crystal grades at this flow, so recheck cell structure and density.
- For OPS, AmSty notes that sheet orientation above 30% hurts brittleness and tear for non-OPS polystyrene; keep your orientation settings when you trial an alternative.
- Medical uses need the producer's current USP Class VI and medical policy letters; AmSty restricts several medical applications.
- Ask for the producer's food-contact letter for the exact grade if the part needs one.
- Run a trial lot and check clarity, shrinkage and cycle time before you switch production.
Buying STYRON 685D: price, lead time and lot size
- Lot size. From one gaylord to a railcar. See gaylord, LTL and truckload for typical weights per box.
- Where it ships from. 22+ partner warehouse locations. Material already in a partner warehouse usually moves sooner than a grade that has to come from the producer; your quote says which applies.
- Price. We do not publish prices because they move with feedstock, freight and order size. What moves your price most: lot size, color, ship-to region, and whether you need STYRON 685D itself or can accept a matched alternative. See how resin is priced and the monthly market update.
- Paperwork. Supplier COA on every prime lot (what a COA shows). Ask for the producer’s regulatory letter or UL file if your part needs them.
- Trying an alternative? Start with one gaylord as a trial lot, molded and checked before you commit a full release.
- If STYRON 685D itself is not available. Some branded grades are sold only through the producer’s own channels or go on allocation. If we cannot source it, we tell you, then quote a matched alternative with a side-by-side comparison.
Send the grade code, your annual volume and ship-to location. A polymer chemist checks it before we quote; we have been in the resin business for 30+ years. For several grades at once, use the resin RFQ template.
Trade names belong to their owners. ResinBridge is not affiliated with these producers; grade names are used only to identify the material. Data reflects published sheets as of October 2026.
Sources
- AmSty STYRON 685D product information sheet, March 2026 (PDF)
- AmSty general purpose polystyrene grade list
- TotalEnergies Polystyrene 595T technical data sheet (PDF)
- TotalEnergies Polystyrene 535B technical data sheet (PDF)
- TotalEnergies 535B product page
- Trinseo 10-Q, Q2 2026 (Chapter 11 status)
- Trinseo directors’ report, October 2026 (expected Chapter 11 exit)
Common questions
What is STYRON 685D?
STYRON 685D is a high heat, high tensile strength crystal polystyrene (GPPS) with a blue tint, sold in North America by AmSty for foam, OPS sheet and medical parts.
What is the melt flow of STYRON 685D?
1.5 g/10 min, measured at 200°C / 392°F, 5 kg, ASTM D1238. Vicat softening temperature is 108°C / 227°F (ASTM D1525).
What is equivalent to STYRON 685D?
Grades from other producers to ask about include TotalEnergies Polystyrene 595T and 535B. None is identical; compare data sheets and run a trial, and get approval if your part names STYRON 685D.
Is STYRON 685D food-contact compliant?
AmSty states it complies with FDA 21 CFR 177.1640 when used unmodified for food contact articles. Ask for the current letter for your exact use.
Can ResinBridge supply STYRON 685D?
We quote STYRON 685D when our supply partners can source it. If they cannot, we say so up front and quote a matched alternative, named on the quote with its data sheet, so you can decide whether to trial it.
If your grade is not listed, tell us what you run. We source commodity, engineering and specialty resins.
Need STYRON 685D or an equivalent?
A polymer chemist reviews every request, then matches your grade or finds a matched alternative and prices it.
What to send for an accurate quote
- The grade name, from any supplier, or a data sheet
- Color (natural, black or a custom match)
- Fill type and percentage, if any
- Melt flow, if you know it
- Quantity for this order and what you use in a year
- Ship-to city and state or province
Quote STYRON 685D or a matched alternative
A polymer chemist checks the data sheet and tells you exactly what you would get before you order.
Request a QuoteNot sure which grade fits your part?
Send the grade you run now, or describe the part.