Renfert GEO hard wax casting sprue green – dental casting system
Référence: 676.2025
Renfert GEO hard wax casting sprue for dental casting systems
The Renfert GEO casting sprue made of hard wax allows the creation of regular, stable and precise casting channels for dental prosthetic casting work.
Its formulation without elastic memory makes it easy to shape the sprue system. The wax stays in place without unwanted spring-back, helping to secure the investing process.
Stable casting wax for bridges, frameworks and laboratory work
This hard wax casting sprue is designed for dental laboratories requiring precise positioning of channels before investing. It is suitable for casting systems used for metal restorations, bridges, frameworks and components requiring consistent metal flow.
Laboratory advantages
- Hard wax with excellent stability after adaptation.
- No elastic memory to reduce internal stresses.
- Clean shaping of casting channels.
- Green color for quick visual control.
- Convenient 250 g roll for regular lab use.
Dental applications
- Creation of main casting channels.
- Fabrication of secondary channels and vents.
- Preparation of bridges, frameworks and metal structures.
- Investing wax patterns.
- Traditional fixed or removable prosthetic workflows.
Placement advice
Choose the sprue diameter according to the metal volume and geometry of the part. Main channels must ensure smooth flow, while secondary channels should guide the metal without creating sharp angles.
- Prefer smooth curves rather than sharp transitions.
- Heat locally to obtain clean junctions.
- Check the continuity of the sprue system before investing.
Lab tip
Before investing, ensure the sprue does not pull on the wax pattern. Proper positioning reduces deformation and improves casting consistency.
The green contrast also helps visualize the design on lighter or darker modeling waxes.
Renfert document & resource
Access the official Renfert guide dedicated to wax modeling in dental laboratories. This document details best practices for sprue system design and investing optimization.
Technical specifications
| Product | GEO hard wax casting sprue |
|---|---|
| Brand | Renfert |
| Reference / SKU | 676.2020 |
| Color | Green |
| Packaging | 250 g roll |
| Wax type | Hard wax for casting channels |
| Main use | Sprue system creation before investing |
Delivery
Product supplied in a 250 g roll. Several diameters of Renfert GEO sprues may be available depending on laboratory needs.
FAQ — Renfert GEO casting sprue
Why use hard wax for casting sprues?
Hard wax provides better stability after adaptation. It allows the creation of a stable sprue system
without excessive elastic memory, reducing stress on the wax pattern and maintaining geometry during investing.
How to choose the sprue diameter?
It depends on the metal volume, channel length and part complexity.
The main channel should be larger than secondary channels to ensure proper flow.
Does the green color have a technical benefit?
Yes, it improves visibility and control of the sprue design on wax patterns,
especially in complex restorations.
How to avoid stress during placement?
Use smooth curves and avoid twisting. Ensure the sprue does not pull on the pattern before investing.
Is this sprue suitable for traditional dental techniques?
Yes, it is fully compatible with conventional casting workflows in dental laboratories.
Renfert GEO hard wax casting sprue green – dental casting system