A polyurethane pig cup is a moulded urethane seal that gives a cleaning pig its drive and scraping contact. EMT supplies cups, discs and spacer rings in Shore 85A with harder or softer options for abrasive or gentle lines.
Introduction
A polyurethane pig cup is the part of a pig that meets the pipe wall and does the work. It is the first thing to wear, and a worn cup loses seal and tracking. EMT treats the cup as a consumable, not a captive part, and stocks it to match its cleaning and gauging pigs. Because the company pours its own urethane, the shore hardness and geometry are tuned to the line rather than bought off the shelf.
Materials And Hardness
EMT pours every cup, disc and spacer ring in polyurethane. The default is Shore 85A, with 82A for gentler service and 87A where abrasion is heavier. For lines below DN300 the spacer that separates cups or discs is nylon; above DN300 it is steel. The urethane carries wear-resistant filler, which is the reason EMT cites longer life against competing brands.
Where It Fits
Cups and discs suit the steel-body cleaning pig and the all-polyurethane pig alike. Discs give support and tracking, cups give the sealing drive, and spacer rings hold the geometry. The same material family covers gauging pigs, where a soft aluminium plate sits between urethane discs to feel for deformation.
When To Replace
Plan a change when the cup edge loses its square contact or the pig starts to slip and slow. On abrasive lines keep one spare set per pig on the shelf. EMT can supply a full seal kit by pig model and nominal diameter so the downtime is a swap, not a wait.
Ordering Notes
Quote the pig model, the nominal diameter and the wall thickness. State the media and temperature so the shore hardness is right. EMT matches the part to the existing tool rather than shipping a generic size.
Key Features
- Shore 85A standard – With 82A and 87A to match gentle or abrasive lines.
- Wear-resistant mix – Longer life than generic urethane seals.
- Full kit supply – Cups, discs and rings by pig model and size.
- Self-poured – Geometry and hardness tuned in house, not bought in.
- Quick swap – Field-replaceable, keeps the pig in service.
Specifications
| Attribute | Value |
| Material | Polyurethane (PU) |
| Hardness | Shore 85A std, 82A / 87A options |
| Spacer below DN300 | Nylon |
| Spacer above DN300 | Steel |
| Fits | Steel-body and all-PU pigs, gauging pigs |
| Supply form | Seal kit by model and nominal diameter |
FAQ
What shore hardness do I need?
Start at 85A for most lines. Choose 82A where the pipe is clean and the run gentle, and 87A where sand, scale or long runs wear the seal fast. EMT confirms against your line data.
Is a polyurethane pig cup the same as a disc?
No. The cup drives the seal and the disc supports and tracks. A pig usually carries both, plus spacer rings to hold the layout.
Can I get a kit for a pig EMT did not make?
EMT matches by model, nominal diameter and wall thickness. If the pig is another maker’s, send the drawing and they will quote a compatible seal set.
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