Round Rod in PPE FR 3048 mm black

When the specification says UL 94 V0, low smoke development and the lowest possible weight, the list of candidates is short. Round rod in PPE FR in black is on it: a modified polyphenylene ether with the flame retardant in the polymer itself, meant for turned parts in aircraft, rail vehicles and other transport. No surface layer, no post treatment; the fire properties sit in the material and run through the whole cross section.

Black is the standard color in these settings. The material is colored all the way through, so a turned surface comes out in the same color as the raw rod, and the parts blend into interiors and electronics environments where components should neither be seen nor reflect light. No painting, no post treatment needed.

Material data from the source sheet: density 1.1 g/cm³, fire rating V0 according to UL 94 and documentation according to the aviation standard FAR 25.853, which governs flammability of materials in aircraft cabins. The maximum operating temperature is 85 °C. Add to that low smoke development, very low water absorption and good electrical insulation; a combination that explains why the grade keeps turning up in cabin and railcar interiors around the world.

The low moisture absorption is more than a footnote. Nylon, the most common turning plastic in the workshop, can move several tenths of a percent on dimension when the humidity rises; PPE stays put. For insulators and spacers with tight fits, that means the dimensions from the lathe still hold once the part is mounted, whether it is dry winter air or humid high summer in the workshop.

On temperature the grade is made for the reality of interiors rather than the engine bay. A maximum of 85 °C covers passenger compartments, cabins and electronics enclosures with good margin, but parts close to heating elements, light fittings or power electronics deserve a check calculation. If you need more temperature you have to move up in price; if you need less there are cheaper plastics, though rarely with the same fire paperwork in order.

Pure polyphenylene ether is too stiff flowing to produce and machine efficiently, so commercial PPE grades are modified blends with the machinability built in. On the lathe you notice it right away: the material cuts clean, threads nicely and holds tolerances without fuss. Ordinary sharp tools are enough, and the low density makes even larger parts easy to handle.

The rods are supplied in the diameters 12.7 and 19.05 mm, that is half an inch and three quarters of an inch respectively, in the length 3048 mm which corresponds to ten feet. The inch measure comes from the grade being made for the aerospace industry's international market, and the diameters cover most small insulator and spacer parts. The product family also holds the same rod in gray, along with sheets in the same material for milled blanks.

Typical applications: electrical insulators, feedthroughs and connector holders, spacer sleeves, guide parts and threaded components at Swedish subcontractors to the rail and aerospace industries. Enclosure parts in electronics often land here as well, since the V0 requirement in practice rules out the standard plastics before the material discussion has even started. A common scenario: a designer needs twenty or so insulator sleeves for a control cabinet in a railcar, and the only thing stopping the POM solution is the fire requirement. Then it is this rod that goes into the lathe.

Avoid aromatic solvents both when cleaning and when bonding; they attack polyphenylene ether. Mechanical fastening and threading are the safe joining methods. Full strength values, electrical data and certificates are in the manufacturer's TDS, and if you need the rods cut in other lengths we arrange that with CTS, our cut-to-size service.

Questions about fire requirements, documentation or choice of diameter? Contact us and we will take it from there.