Canvas Phenolic Tube

Canvas phenolic tube delivers the impact resilience of the heavy canvas weave in a ready-to-bore sleeve geometry — the highest-impact phenolic tube option for press-fitted bearing sleeves, heavy conveyor guide tubes, and structural isolating sleeves in aggressive industrial and mining environments.

TL;DR — Canvas Phenolic Tube Quick Facts

Standard Sizes — Canvas Phenolic Tube

Canvas phenolic tube is primarily a custom-configured form, specified by OD, ID (or wall thickness), and length:

Canvas phenolic tube is available in larger ODs than linen phenolic tube; the heavier canvas fabric is suited to the high-pressure compression molding required for large OD tube sections. Near-stock tube at standard OD/wall combinations (2", 3", 4", 6" OD with 1/4" and 1/2" walls) is available from distribution; confirm stock at time of quotation.

Properties Relevant to Tube Form

Canvas phenolic tube's manufacturing process winds or compression-molds heavy canvas fabric plies circumferentially — the result is a hoop-strong sleeve with the impact-absorbing character of the canvas fiber matrix. Hoop strength and compressive strength are the governing properties for sleeve-bearing and structural applications.

The elevated Izod impact value (1.5–2.5 ft·lb/in vs. 1.0–1.5 for cotton and 0.8–1.2 for linen phenolic) is the primary reason to specify canvas over the other fabric grades in tube form. Applications involving shock loads at the sleeve face, press-fit installation with a hammer or hydraulic press, or dynamic vibration through the tube wall should default to canvas phenolic.

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

Typical Applications — Tube Form

Canvas phenolic tube is the go-to phenolic sleeve for heavy-duty and shock-loaded bearing applications:

Heavy-load sleeve bearings — mining and aggregate equipment — Canvas phenolic tube bored to fit shafting on conveyor pulleys, trommel screens, and crusher shafts where the bearing sees heavy radial loads combined with shock from material impact on the conveyor belt or screen deck. The high hoop strength and impact resistance prevent sleeve cracking during shock events.

Press-fit bearing shells in large housings — Canvas phenolic tube pressed into cast iron or steel housings without line-boring the housing — the heavy canvas construction tolerates the press-fit installation force and subsequent thermal cycling without cracking that finer-weave grades may experience.

Structural insulating tubes in outdoor switchgear — Large-diameter canvas phenolic tube used as the structural body of disconnect switch operating arms, insulating tension tubes, and high-voltage standoff tubes in substations. The heavy wall provides mechanical strength; the phenolic resin provides electrical isolation.

Marine propulsion shaft isolation sleeves — Canvas phenolic tube sleeving shafting connections between the propeller shaft and thrust bearing in vessels where cathodic protection requires electrical isolation of the shaft. The heavy impact tolerance accommodates dock-bang and rough-water shock loads.

Crusher and ball mill wear sleeves — Thick-wall canvas phenolic tube sections used as liner sleeves in ball mill and crusher trunnion bearings in mineral processing plants.

Agricultural and forestry machinery bearings — Sleeve bearings on combine harvester heads, chipper drums, and field equipment where dust, mud, and shock loads combine and re-lubrication access is limited. Canvas phenolic runs dry or with grease for extended maintenance intervals.

Machining Notes — Tube

Canvas phenolic tube machines with the same tooling approach as cotton phenolic tube, with modifications for the heavier fiber:

OD turning: Carbide-tipped tooling, 350–500 SFM. The heavy canvas weave is more aggressive on tool edges than cotton phenolic — expect faster flank wear and increase tool change frequency in production. Use steady rest support for ODs above 4" to prevent chatter from tube wall flexibility.

Bore finishing (ID): Single-point boring bar; positive rake insert (5°–10°). Spring-back 0.001"–0.003" after boring in canvas phenolic (slightly more than cotton due to the heavier fiber matrix). Hone to finish after boring for sleeve bearing applications: 180–240 grit achieves Ra 32–63 μin — adequate for sleeve bearing service, though not as smooth as linen phenolic.

Wall thickness measurement: Canvas phenolic tube wall may show slightly more variation (within the NEMA LI 1 ±0.010" wall tolerance) than linen or cotton phenolic due to the coarser fiber. Measure wall at multiple circumferential positions before committing to a critical bore dimension.

Parting/cutoff: Carbide parting blade; support tube close to the parting blade. Canvas phenolic is less prone to parting crack-through than linen phenolic due to the higher impact toughness — but the heavier wall still requires solid support to prevent blade grab.

Dust control: NIOSH P100 respirator; localized exhaust ventilation; no open flame near accumulated phenolic dust. Same respiratory hazard profile as cotton and linen phenolic.

See the Canvas Phenolic Machining Guide for complete parameters.

Standards and Compliance

Canvas phenolic tube is typically produced to NEMA Grade C property requirements. Request a Certificate of Conformance citing the NEMA LI 1 grade at order entry. For custom ID/OD configurations, confirm documentation requirements at quotation stage.

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Other canvas phenolic forms

• Canvas Phenolic Rod
• Canvas Phenolic Sheet