If you move dust, chips, pellets, or fumes for a living, you’ve probably wrestled with hoses that kink, crack, or smell odd. That’s why the Pu Flexible Ducting Hose—marketed here as PU Hose Straight—has been getting a lot of attention. Built in CHANGAN DISTRICT, SHIJIAZHUANG, HEBEI, CHINA, it’s one of those unglamorous components that quietly keep production lines humming, from woodworking to plastics conveying.

Why polyurethane—and why now?

Industry-wide, there’s a steady shift away from PVC toward ether-based polyurethane for ducting. The reasons aren’t mysterious: better abrasion resistance, lighter weight for the same wall thickness, and—surprisingly—less odor. Many customers say the hose “just feels tougher” and holds shape on tight bends. In fact, a small bending radius and excellent flexibility are core selling points. The Pu Flexible Ducting Hose also tends to resist hydrolysis and microbial attack better than older blends, which helps in humid or dusty plants.

Quick technical snapshot

Parameter	Typical value	Notes
Inner diameter (ID)	25–400 mm (≈)	Custom diameters on request
Wall thickness	0.4–1.0 mm (typ.)	Real-world use may vary by size
Temperature	-40°C to +90°C; peaks ≈120°C	Short-term peaks only
Hardness	Shore A ≈ 85–95	ASTM D2240/ISO 868
Abrasion loss	≈30–40 mm³	DIN 53516 / ISO 4649
Conductivity	Optional antistatic	ISO 8031 method

How it’s made (and tested)

• Materials: ether-based PU resin, transparent wall; spring steel wire helix; optional copper wire for static grounding.
• Process: helix co-extrusion; solvent-free bonding; trimmed and cuffed; cut-to-length coils.
• Testing: hardness (ASTM D2240), abrasion (ISO 4649/DIN 53516), compression set, flex cycles, electrical resistance (ISO 8031), and flammability options (UL 94, on request).
• Compliance: REACH, RoHS; food-contact grades available per FDA 21 CFR (customer-specified).
• Service life: around 3–5 years in typical dust extraction; heavy abrasive granulates may shorten life.

Where it’s used

Wood dust and chips, plastic granulate conveying, powder coating booths, agricultural seed/fertilizer transfer, fume and vapor extraction (non-corrosive), and flexible connections on packaging machines. To be honest, I’ve seen more failures from undersized wall thickness than from the hose design itself—spec it for the worst particle and bend radius you expect.

Vendor landscape (real-world snapshot)

Vendor	Wall (≈)	Temp (°C)	Certs	MOQ / Lead	Notes
ZSMARTFLEX (PU Hose Straight)	0.4–1.0 mm	-40 to +90	REACH/RoHS; FDA options	Low / 2–4 wks	Clear wall; antistatic available
Vendor A (EU)	0.5–1.2 mm	-40 to +100	REACH/RoHS	Med / 3–6 wks	Food-grade SKUs common
Vendor B (US)	0.6–1.0 mm	-30 to +90	UL 94 options	Low / 1–3 wks	Strong distributor network

Customization and field notes

You can spec the Pu Flexible Ducting Hose with custom diameters, cuffed ends, printed logos, conductive additives, or food-contact material grades. One packaging plant told me their antistatic version cut nuisance ESD shocks and reduced downtime by ~40% after switching; another woodworking shop said the hose stayed surprisingly odorless even right out of the box.

Buying tips

• Match wall thickness to abrasion: pellets and sharp chips need thicker walls.
• Check bend radius; too-tight runs shorten life.
• For powders, consider antistatic (
• Ask for test data: abrasion (ISO 4649), hardness (ASTM D2240), and any UL 94 or FDA declarations you need.

Citations

1. ISO 4649: Rubber, vulcanized or thermoplastic — Determination of abrasion resistance.
2. DIN 53516: Testing of rubber; determination of abrasion resistance.
3. ASTM D2240 / ISO 868: Standard Test Method for Rubber Property—Durometer Hardness.
4. ISO 8031: Rubber and plastics hoses and hose assemblies — Determination of electrical resistance.
5. UL 94: Tests for flammability of plastic materials; FDA 21 CFR (food-contact parts), REACH and RoHS directives.