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ULTEM 2300: 30% glass PEI specs and equivalent grades

SABIC 30% glass fiber reinforced polyetherimide (PEI): Tg 217°C, HDT 210°C at 1.82 MPa, inherently flame retardant, opaque, for stiff high-heat injection molded parts. Published data, how it compares with ULTEM 2200 and 2400, grades from other producers to ask about, and how to request a quote from one gaylord.

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The short answer

ULTEM 2300 is SABIC’s standard-flow polyetherimide (PEI) reinforced with 30% glass fiber. It keeps PEI’s 217°C glass transition temperature and inherent flame retardance, and the glass makes it about three times as stiff as unfilled Ultem 1000 (tensile modulus 10,400 vs 3,350 MPa, ASTM D638). It is opaque and can be custom colored. Published specific gravity is 1.51 (ASTM D792), melt flow is 5 g/10 min at 337°C / 639°F, 6.6 kg (ASTM D1238), HDT is 210°C at 1.82 MPa (ASTM D648, 6.4 mm), and the UL 94 V-0 listing starts at 0.25 mm. These are typical values; confirm on the current producer data sheet. Grades to ask about include RTP 2105, a 30% glass PEI from a compounder, SABIC’s own 40% glass ULTEM 2400, and Victrex PEEK 450GL30 as a different, semi-crystalline polymer. They are not identical, so compare the data sheets and run a trial before switching.

Also written as: SABIC sells related 30% glass PEI grades under separate codes, for example ULTEM 2300F (food-contact approvals per SABIC’s description), 2300R (enhanced mold release), 2310 (higher flow) and 2312 (30% milled glass instead of glass fiber); these are separate grades, not color codes. SABIC also offers ISCC+ bio-based versions of 2300 under different color codes. ULTEM 2200 (20% glass) and 2400 (40% glass) are the sister grades. Quote the full code and color from your drawing or bag label; suffixes change the grade.

Buying ULTEM 2300: 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

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ULTEM 2300 specs from the data sheet

Typical values from SABIC’s global data sheet for ULTEM 2300 (SABIC PDF, revision dated May 2026, hosted by a distributor). These are typical values; confirm on the current producer data sheet. 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	SABIC	Producer named on the May 2026 data sheet; brand owners change, so confirm on current paperwork
Polymer	Polyetherimide (PEI), 30% glass fiber reinforced, standard flow, amorphous; opaque, can be custom colored
Process	Injection molding; the sheet also lists sheet extrusion, profile extrusion and compression molding
Melt flow	MFR 5 g/10 min (ASTM D1238); MVR 6 cm³/10 min (ISO 1133)	337°C / 639°F, 6.6 kg (ASTM); 360°C / 680°F, 5.0 kg (ISO)
Density	1.51 g/cm³ (ISO 1183); specific gravity 1.51 (ASTM D792)
Mold shrinkage, flow, 3.2 mm	0.2–0.4 %	SABIC method; no cross-flow value on the sheet
Water absorption, 24 h / saturated, 23°C	0.16 % / 0.9 %	ASTM D570 and ISO 62-1
Tensile modulus	10,500 MPa (ISO 527); 10,400 MPa (ASTM D638)
Tensile stress at break	175 MPa (ISO 527 and ASTM D638)	5 mm/min
Tensile strain at break	2.4 % (ISO 527); 2.5 % (ASTM D638)
Flexural modulus / stress at break	9,600 MPa / 240 MPa (ISO 178); 9,400 MPa / 230 MPa (ASTM D790, 100 mm span)
Notched Izod impact, 23°C	90 J/m (ASTM D256); 10 kJ/m² (ISO 180/1A)
Glass transition temperature	217°C / 423°F	As stated in SABIC’s description
HDT 1.82 MPa / 0.45 MPa, 6.4 mm, unannealed	210°C / 410°F; 212°C / 414°F	ASTM D648 (ISO 75/Af flatwise: 210°C)
Vicat softening temperature	213°C (B50)	ISO 306
Coefficient of thermal expansion	18 × 10^-6/°C in flow; 48 × 10^-6/°C across flow	ASTM E831, -20°C to 150°C (ISO 11359-2, -40°C to 150°C, gives the same values)
Relative temperature index	180°C electrical; 170°C mechanical with impact; 180°C mechanical without impact	UL 746B
Flammability	UL 94 V-0 at 0.25 mm and above; 5VA at 1.2 mm and above	UL 94, as listed; UL file E121562
Oxygen index	48 % (ISO 4589); 50 % (ASTM D2863)
Aerospace flame	SABIC’s description cites FAR 25.853 performance	As stated on the sheet
Dielectric strength, in oil	35 kV/mm at 0.8 mm; 15 kV/mm at 3.2 mm	IEC 60243-1
Comparative tracking index	150 V	IEC 60112
Drying	150°C / 302°F for 4–6 h; max moisture 0.02 %; max cumulative 24 h	Producer processing data
Melt / mold temperature	350–410°C (662–770°F) / 135–180°C (275–356°F)	Producer processing data
Food contact	Food-contact versions are sold as a separate grade (ULTEM 2300F). Ask for SABIC’s regulatory letter for the exact grade and color.

Source data sheets are listed at the bottom of this page. Confirm against the current sheet for your exact grade code and color.

Glass fiber makes properties depend on flow direction: thermal expansion across flow (48) is more than double the in-flow value (18). Gate location and wall design matter more than with unfilled Ultem 1000.

Mold temperatures of 135–180°C usually need oil or high-temperature mold heaters rather than water; check your press and tool before planning a trial.

ULTEM 2200 vs 2300 vs 2400: 20%, 30% and 40% glass

SABIC’s 20%, 30% and 40% glass fiber PEI grades share the same base resin and the same 217°C Tg. More glass adds stiffness and lowers shrinkage and expansion; it barely moves HDT. Values below are ASTM results from SABIC data: ULTEM 2300 and 2400 from the global data sheets (2026), ULTEM 2200 from SABIC’s Americas sheet as reproduced by UL Prospector (2024). These are typical values; confirm on the current producer data sheet.

Property	ULTEM 2200	ULTEM 2300	ULTEM 2400
Glass fiber	20 %	30 %	40 %
Specific gravity (ASTM D792)	1.42	1.51	1.61
Melt flow, 337°C / 6.6 kg (ASTM D1238)	6.0 g/10 min	5 g/10 min	4.2 g/10 min
Tensile strength at break (ASTM D638)	131 MPa	175 MPa	179 MPa
Tensile modulus (ASTM D638)	6,890 MPa	10,400 MPa	11,720 MPa
Flexural modulus (ASTM D790, 100 mm span)	6,890 MPa	9,400 MPa	11,720 MPa
Notched Izod, 23°C (ASTM D256)	64 J/m	90 J/m	112 J/m
HDT, 1.82 MPa, 6.4 mm (ASTM D648)	210°C	210°C	212°C
CTE in flow, -20°C to 150°C (ASTM E831)	21 × 10^-6/°C	18 × 10^-6/°C	14 × 10^-6/°C
Mold shrinkage, flow, 3.2 mm	0.3–0.5 %	0.2–0.4 %	0.1–0.3 %
UL 94 as listed on the sheet	V-0 above 0.41 mm; 5VA above 1.9 mm	V-0 at 0.25 mm and above; 5VA at 1.2 mm and above	V-0 at 0.25 mm and above; no 5VA listed
RTI, electrical (UL 746B)	170°C	180°C	170°C
Mold temperature (producer data)	135–165°C	135–180°C	135–165°C

Stiffness is the main reason to step up in glass: flexural modulus goes from 6,890 to 9,400 to 11,720 MPa.
HDT at 1.82 MPa is nearly flat (210, 210 and 212°C). If a part needs more heat, more glass will not get it; that points to a different polymer.
Parts get heavier as glass goes up (specific gravity 1.42, 1.51, 1.61), and flow drops (6.0, 5 and 4.2 g/10 min).
Shrinkage differs at each glass level, so a tool cut for one grade may not hold dimensions with another. Treat a change from 2300 to 2200 or 2400 as a grade change that needs approval and a trial.
UL ratings depend on thickness, color and region. The 2200 values come from the Americas sheet; check the UL Yellow Card for your exact grade and color. See UL 94 flame ratings.

Grades to ask about instead of ULTEM 2300

We did not find a published 30% glass sheet from another PEI base-resin producer. RTP 2105 is a 30% glass PEI compound from RTP Company, a compounder; its sheet does not say where the base resin comes from. ULTEM 2400 is SABIC’s own 40% glass grade. Victrex PEEK 450GL30 is a different polymer that buyers look at when glass-filled PEI is short or runs too cool. None is a drop-in replacement. If your part, drawing or customer approval names ULTEM 2300, any change needs your approval and usually a trial.

Grade	Producer	Melt flow	Density	Key property	How it compares
RTP 2105	RTP Company	Not published on the sheet	Specific gravity 1.50 (ASTM D792)	30% glass fiber; tensile strength 173 MPa (ASTM D638); flexural modulus about 10,000 MPa (ASTM D790); notched Izod 85 J/m (ASTM D256); HDT 207°C at 1.82 MPa (ASTM D648); V-0 at 1.5 mm per RTP Company testing	Close on paper. Same glass level, with strength, stiffness and HDT near ULTEM 2300. The flame rating is RTP’s own test at 1.5 mm, not a UL listing down to 0.25 mm; the sheet shows no RTI; and RTP’s drying target is 0.04 % moisture vs 0.02 % on SABIC’s sheet. The sheet does not name the base resin source. Ask for the UL file and certifications before a trial. Quote this alternative ›
ULTEM 2400	SABIC	4.2 g/10 min (337°C / 639°F, 6.6 kg, ASTM D1238)	Specific gravity 1.61 (ASTM D792)	40% glass fiber; tensile strength 179 MPa, tensile modulus 11,720 MPa (ASTM D638); flexural modulus 11,720 MPa (ASTM D790); HDT 212°C at 1.82 MPa (ASTM D648); UL 94 V-0 at 0.25 mm and above	Same producer, more glass. Stiffer and heavier, with lower shrinkage (0.1–0.3 % vs 0.2–0.4 %), lower flow and a lower electrical RTI (170°C vs 180°C). The sheet lists no 5VA rating. Because shrinkage differs, parts from a 2300 tool may not hold dimensions. Quote this alternative ›
Victrex PEEK 450GL30	Victrex	Melt viscosity 550 Pa·s at 400°C (ISO 11443); no MFR published	1.51 g/cm³ (ISO 1183)	30% glass fiber; tensile stress at break 179 MPa, tensile modulus 11,500 MPa (ISO 527); HDT 328°C at 1.8 MPa (ISO 75-2/Af); Tg 143°C (onset), melting point 343°C; RTI 240°C electrical (UL 746B)	Different polymer. Semi-crystalline PEEK with a much higher HDT and RTI and stronger chemical resistance. The sheet shows no UL 94 rating, shrinkage is 0.30 % in flow but 0.90 % across flow, and it needs mold temperatures of 180–200°C, so the mold and part design usually change. See PEEK vs. PEI. Quote this alternative ›

From each producer’s published data. These are typical values; confirm on the current producer data sheet. Brand owners and grade names change.

Typical uses for ULTEM 2300

SABIC’s data sheet lists these industries for ULTEM 2300:

Automotive under-the-hood and heavy truck parts
Aerospace components (SABIC’s description cites FAR 25.853 performance)
Electrical and electronic parts, including energy management, lighting and wireless communication
Industrial electrical components and material handling
Healthcare and surgical devices, pharmaceutical packaging and drug delivery (grade dependent)
Home and commercial appliances
Rail and mass transportation parts
Building components and water management

SABIC lists creep resistance, dimensional stability, high stiffness and strength, low warpage and electroplatability among the grade’s features. That is the usual reason to choose 2300 over unfilled Ultem 1000: more stiffness and less movement at temperature, at the cost of elongation (2.5 % vs 60 % at break, ASTM D638) and transparency.

What to check before you switch

Owner check: the current ULTEM 2300 data sheet (May 2026) is issued by SABIC. Brand owners change, so confirm that your COA, UL file and regulatory letters name the current producer. See the brand ownership tracker.
Pick the right 2300-series grade. Food-contact, enhanced-release, higher-flow and milled-glass versions (2300F, 2300R, 2310, 2312) are separate grades. If your drawing says ULTEM 2300, do not accept a suffix grade without approval, and the reverse.
Glass level is part of the grade. ULTEM 2200, 2300 and 2400 have different stiffness, weight and shrinkage; one is not a substitute for another without approval.
PEI from other sellers (RTP 2105) may not carry the same UL listing, RTI, FAR 25.853 statement or food-contact letters. Ask for each document by grade and color before a trial.
PEEK is not a PEI substitute without redesign. It is semi-crystalline, shrinks differently across flow, needs hotter tools, and its sheet shows no UL 94 rating. See PEEK alternatives.
PEI must be dry. The sheet asks for 150°C for 4–6 hours, 0.02 % maximum moisture and no more than 24 hours cumulative drying. See our resin drying guide.
Compare melt flow, density and impact only at the same test condition and method (ASTM vs. ISO results differ).
Run a trial lot and check shrinkage in both directions, warp, cycle time and appearance before you switch production.

Buying ULTEM 2300: 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 ULTEM 2300 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 ULTEM 2300 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 November 2026.

Sources

Common questions

What is ULTEM 2300?

ULTEM 2300 is SABIC’s standard-flow polyetherimide (PEI) reinforced with 30% glass fiber. It has a glass transition temperature of 217°C, is inherently flame retardant, is opaque and can be custom colored. It is a SABIC grade.

What is the density of ULTEM 2300?

1.51 g/cm³ (ISO 1183), specific gravity 1.51 (ASTM D792). Melt flow is 5 g/10 min at 337°C / 639°F, 6.6 kg (ASTM D1238). These are typical values; confirm on the current producer data sheet.

What is the heat deflection temperature of ULTEM 2300?

210°C at 1.82 MPa and 212°C at 0.45 MPa (ASTM D648, 6.4 mm, unannealed); ISO 75/Af gives 210°C. The glass transition temperature is 217°C.

What is the difference between ULTEM 2200, 2300 and 2400?

Glass content: 20%, 30% and 40% glass fiber. On SABIC’s sheets, flexural modulus rises from 6,890 to 9,400 to 11,720 MPa (ASTM D790) and specific gravity from 1.42 to 1.51 to 1.61, while HDT at 1.82 MPa stays near 210°C. Shrinkage differs, so they are not interchangeable without approval.

What is equivalent to ULTEM 2300?

Grades to ask about include RTP 2105 (30% glass PEI from RTP Company), SABIC’s 40% glass ULTEM 2400, and Victrex PEEK 450GL30, a different polymer that sometimes replaces glass-filled PEI after redesign. None is identical; compare data sheets and run a trial, and get approval if your part names ULTEM 2300.

How do you dry ULTEM 2300 before molding?

SABIC’s sheet calls for 150°C / 302°F for 4–6 hours to a maximum of 0.02 % moisture, with no more than 24 hours cumulative drying. Melt temperature is 350–410°C and mold temperature 135–180°C.

Can ResinBridge supply ULTEM 2300?

We quote ULTEM 2300 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.

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