Canvas Phenolic Rod

Canvas phenolic rod is the impact-tolerant, heavy-load bushing stock in the phenolic laminate family — the heavier canvas weave (versus cotton or linen) delivers the highest Izod impact strength of any fabric-reinforced phenolic grade, making it the right choice for shock-loaded bushings, large-diameter gear blanks, and structural bearing components in aggressive industrial environments.

TL;DR — Canvas Phenolic Rod Quick Facts

Standard Sizes — Canvas Phenolic Rod

Per NEMA LI 1 (Industrial Laminated Thermosetting Products):

Commonly stocked diameters: ½, ¾, 1, 1¼, 1½, 2, 2½, 3, 4, 5, 6, 8, 10, 12 inches.

All tolerances are unilateral positive (oversize). Ovality up to 1% of nominal diameter for rods ≤4" OD.

Canvas phenolic rod is available in the same large diameters as cotton phenolic — up to 12" diameter as standard stock — distinguishing it from linen phenolic which typically tops out near 6".

Properties Relevant to Rod Form

Canvas phenolic uses a heavy-weave canvas (jute or heavy cotton canvas) fabric reinforcement versus the finer weave of standard cotton phenolic. This results in a coarser but tougher internal fiber matrix:

The elevated impact strength is the defining property advantage of canvas phenolic over cotton or linen phenolic. For applications involving shock loads, press-fit installation, or dynamic vibration through the bushing wall, canvas phenolic provides a safety margin against cracking that finer-weave grades do not.

Trade-off: the coarser canvas weave produces a rougher machined surface (Ra 63–125 μin typical) than linen phenolic. Do not specify canvas phenolic where a smooth bore finish is required for close-tolerance bearing fits.

For the full property datasheet, see the Canvas Phenolic properties page.

Typical Applications — Rod Form

Canvas phenolic rod targets the most demanding bushing and bearing applications in the fabric phenolic family:

Heavy-load bushings for industrial machinery — Press platens, rolling mill guides, heavy-duty conveyors, and mining equipment where the bushing must absorb shock loading without cracking. Canvas phenolic's Izod impact strength (up to 2.5 ft·lb/in) exceeds cotton phenolic's 1.0–1.5 ft·lb/in by a significant margin.

Large-diameter gear blanks — Rod above 6" diameter machined into large-pitch gears for slow-speed, high-torque drives: crane hooks, kiln drives, sugar mill equipment. The large canvas weave absorbs shock at tooth engagement better than finer-weave grades.

Shafting insulator bushings — Large-diameter canvas phenolic rod bored as insulating coupling sleeves on electrically isolated shafting (cathodic protection systems on pipelines, ship propulsion isolation).

Structural compression blocks and pads — Sections of canvas phenolic rod used as compression pads in bridge bearings, structural jacking points, and seismic isolation hardware where compressive loads are high and impact excursions are possible.

Press-fit bearing shells — Where the bushing is pressed into a housing without machining the housing bore: the high impact tolerance of canvas phenolic reduces the risk of bore cracking during assembly that finer-weave grades can suffer.

Hammer mill and crusher liners — Machined rod sections used as wear liners in impact-zone areas of size-reduction machinery where no other phenolic grade provides sufficient impact resistance.

Machining Notes — Rod

Canvas phenolic machines with the same tooling family as cotton phenolic, with adjustments for the coarser weave:

Tooling: Carbide-tipped or solid-carbide tools. The canvas fabric is more abrasive than cotton; expect slightly faster tool wear. PCD tooling is recommended for high-volume production.

Cutting parameters (turning):

• Surface speed: 350–550 SFM (slightly lower than cotton to manage heat from the denser fabric)
• Feed rate (roughing): 0.005–0.010 IPR
• Feed rate (finishing): 0.002–0.004 IPR
• Depth of cut: up to 0.150" roughing

Surface finish expectations: Canvas phenolic will not achieve the Ra 32 μin finish of linen phenolic with the same parameters. Realistic best-case finish on a bore: Ra 63 μin. If a smoother bore is required, switch to cotton or linen phenolic for the application.

Impact during machining: Canvas phenolic is significantly tougher than linen or cotton; interrupted cuts (parting, facing interrupted surfaces) are more forgiving. The material is less prone to cracking during aggressive material removal.

Boring large diameters: For rod above 6" diameter, use a large-bore lathe with steady rest support. Face the end first to establish a flat datum before boring.

Dust control: Canvas phenolic generates combustible dust with respiratory hazard profile. Localized exhaust ventilation, NIOSH P100 respirator, no open flames.

See the Canvas Phenolic Machining Guide for full parameters.

Standards and Compliance

Canvas phenolic typically conforms to NEMA Grade C requirements. Request a Certificate of Conformance citing NEMA LI 1 on every order.

More related guides

Applications

• Bushings & Bearings — Material Selector
• Electrical Insulation — Phenolic & Laminate Options

Industries

• General Industrial Plastics
• Aerospace Plastics

Compare materials

• Cotton vs. Canvas Phenolic
• Linen vs. Canvas Phenolic
• Nylon vs. Cotton Phenolic

Other canvas phenolic forms

• Canvas Phenolic Sheet
• Canvas Phenolic Tube