Through Bores: Plugging and Extraction Direction
To take an impression in a through bore, plug the lower opening with Plastin for a Fluid product, or use a Pasty product such as P35. Before injecting, check both openings to extract from the side with the larger exit diameter.
Two Ways to Stop the Product from Running Out
A Fluid product poured into a through bore runs out through the bottom. You have two ways to deal with this. Plug the lower opening with Plastin, then inject a Fluid product as in a blind bore. Or use a Pasty product such as P35, which does not run and needs no plug.
With a Pasty Product
A Pasty product stays in place in the bore without a plug.
- Place the nozzle in the bore and inject.
- Withdraw the nozzle little by little before the product comes out on the other side.
- Leave a surplus of product at the entry. It is the grip, so no demolding ring is needed.
- Wait for polymerization and pull straight out.
With a Fluid Product and a Plastin Plug
A Plastin plug closes the bottom opening so it holds a Fluid product.
- Degrease the part, then press Plastin over the lower opening.
- Inject from the bottom up, with the tip immersed in the product.
- Add a demolding ring and a grip of about 1 cm.
- Wait for polymerization, pull straight out, then remove the Plastin. It can be used again.
Choose the Extraction Side
A through part has two openings, so two possible extraction directions. Always extract from the side where the removal constraint is lowest, which is the side with the larger exit diameter. Find that side before you inject.
