PPO / PPE supplier: high heat, hot-water stable
Modified polyphenylene ether delivers high heat, dimensional stability and inherently low moisture absorption, with excellent electrical properties and FR options.
One gaylord to a truckload · A polymer chemist reviews every quote · Every prime lot from our suppliers ships with a COA
Updated October 2026
Request a Quote- Impact strength
- Good
- Heat (HDT)
- ~100-150°C
- Clarity
- Opaque
At a glance
- Form
- Pellets
- Order size
- One gaylord to a truckload
- Grades
- General-purpose modified PPE · Flame-retardant grades · Glass-filled grades
- Paperwork
- Supplier COA on every prime lot
- Ships to
- U.S. and Canada
- Sourcing
- Matched to your spec
The short answer
Modified PPE is the pick for dimensionally stable parts in hot, wet service and for halogen-free flame-retardant electrical parts. It absorbs very little water, holds tolerances and resists hydrolysis better than nylon or polyesters. The failure that catches people is chemical: PPE/PS blends stress crack or soften in aromatic and chlorinated solvents, so check everything the part will touch.
Grades we source
Tap a grade to add it to your quote request.
About PPO / PPE
For molding, PPE is almost always supplied as a blend, most often with polystyrene and also with nylon or polypropylene, to make it processable. The result: a stable, low-density engineering resin with very low water uptake, strong electricals, and hydrolytic stability that nylon and polyesters cannot match, a favorite for fluid handling and electrical parts.
Common applications
- Electrical enclosures and components
- Fluid handling and pump parts
- Automotive instrument panels
- Appliance parts in hot/wet service
- Battery and charging components
Typical properties
| Impact strength | Good |
|---|---|
| Heat (HDT) | ~100-150°C |
| Clarity | Opaque |
| Chemical resistance | Excellent vs. water; poor vs. aromatics |
| Relative cost | Moderate |
Property ranges are general guidance and vary by grade and supplier; a polymer chemist confirms the exact spec against the data sheet and certificate of analysis for your application.
Which grade to ask for
Name the blend partner first; PPE/PS, PPE/PA and PPE/PP behave like different resins.
| Grade type | Use it for | Watch out for |
|---|---|---|
| PPE/PS, general purpose | Pump housings, fluid handling, appliance parts | Heat deflection rises with PPE content, so most grades span about 100–150°C; name the one you need |
| PPE/PS, halogen-free flame retardant | Electrical enclosures, battery and charging parts | Flame rating applies at a stated thickness and color; FR grades may run hotter |
| Glass-filled PPE/PS (10–30%) | Stiff fluid-handling parts and structural housings | Shrinkage drops to about 0.2–0.5% along flow at 20% glass, and differs across flow |
| PPE/PA alloys | Automotive exterior panels and parts that go through paint ovens | The nylon phase absorbs moisture, and the drying window is two-sided |
| PPE/PP blends | Battery parts and parts that need better chemical resistance | Lower heat than PPE/PS; dried at lower temperature |
| Foamable grades | Large, thick structural-foam housings | Need a foam process; surface swirl is normal and often painted over |
Typical starting points. Grades vary, so confirm on the data sheet for the exact grade.
Processing notes
- Drying. Modified PPE barely absorbs water (it saturates at about 0.07%), but dry PPE/PS grades at 100–120°C / 212–248°F for 2–4 h to below 0.02%, and never longer than 8 h. PPE/PP grades dry at 65–75°C / 149–167°F. PPE/PA alloys can splay if dried too far, so follow that grade’s sheet.
- Melt temperature. 280–300°C / 536–572°F; flame-retardant grades up to 320°C / 608°F. Keep barrel residence to about 8 minutes or less.
- Mold temperature. 65–120°C / 149–248°F. Published guidance is not consistent, so follow the grade sheet. The hotter end gives better surface and lower molded-in stress.
- Shrinkage. About 0.5–0.7% along flow for unfilled grades; about 0.2–0.5% along flow at 20% glass.
- Regrind. Producer guidance allows clean, non-degraded same-grade regrind up to about 25%, dried a little longer than virgin. For UL-listed parts, the UL 746D allowance is up to 25% in-house regrind of the same grade, so check your UL file before going higher.
- Most common defect. Splay and dark streaks. Splay usually means wet resin, or an over-dried PPE/PA alloy. Dark streaks and specks mean the melt ran too hot or sat too long; PPE darkens with heat history.
What to put on the purchase order
- Blend type. PPE/PS, PPE/PA or PPE/PP. They are not interchangeable in a tool or in service.
- Heat class. The grade’s heat deflection at 1.8 MPa (264 psi), since it tracks PPE content and cost.
- Flame rating. Halogen-free or not, and the UL 94 class at your thickness. UL recognition is grade-specific and color-specific; check the grade’s listing on UL Product iQ, including RTI.
- Melt flow and test condition. Copy both from the data sheet so the COA value can be compared.
- Glass level. Unfilled or the glass percentage.
- Water and food contact. For potable-water parts, the NSF/ANSI/CAN 61 listing for the grade; for food contact, the producer’s FDA letter for the exact grade.
- COA values to check. Melt flow, and glass content (ash) for filled grades.
When to consider something else
- If the part sees fuels, aromatic solvents or chlorinated cleaners at high heat, look at PPS.
- If a flame-retardant housing needs more impact strength and easy color matching, look at PC/ABS or see best plastic for electrical housings.
- If the part sees steam or repeated sterilization, look at PSU / PPSU.
- If heat and flame rating do not matter and cost does, look at HIPS.
- If the part needs oil and fuel resistance and can tolerate moisture uptake, look at nylon 6 or 66.
Common questions
What is the difference between PPO and PPE?
They are the same polymer: polyphenylene oxide and polyphenylene ether are two names for it. For molding it is almost always sold as a blend, mostly with polystyrene, and those blends are called modified PPE.
Does PPE need to be dried?
Usually yes, even though it absorbs very little water. Dry PPE/PS grades at 100–120°C (212–248°F) for 2–4 hours, and not more than 8 hours. PPE/PP and PPE/nylon grades have their own settings, so follow the grade sheet.
What chemicals attack PPE?
Aromatic and chlorinated solvents attack PPE/PS blends and can cause stress cracking or softening. Water, acids and bases are well tolerated. Check every oil, grease and cleaner the part will touch against the grade’s chemical data.
Is modified PPE flame retardant?
Flame-retardant grades are available, many halogen-free, rated up to UL 94 V-0, and some reach 5VA. UL recognition is grade-specific and color-specific and applies at a stated thickness, so check the grade’s listing on UL Product iQ.
Tell us the PPO / PPE grade you run now
A polymer chemist reviews every request, then matches your grade or finds a qualified equivalent 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
Send your modified PPE grade and volume
Send the PPO/PPE grade, heat and flame requirements and volume; a polymer chemist reviews it and we quote a matching grade.
Request a QuoteNot sure which grade to ask for?
Send the grade you run now, or describe the part. A polymer chemist reviews every request.