CHT Group QVB 720 Vacuum Bagging Silicone, 1500 mL Cartridge

Description

QVB 720 silicone is a two-part CHT material for making reusable vacuum bags used in composite molding and resin infusion work. The 1500 mL cartridge format gives shops a packaged option for controlled mixing and application when a reusable bag is built around a mold.

QVB 720 silicone Benefits

• Purple transparency in thin cured sections helps fabricators judge layer thickness during build.
• Fast gel time supports practical bag-making schedules when the mold is already prepared.
• Tear and elongation properties suit flexible bags that must release and return for repeated use.
• Flowable, self-leveling behavior helps cover broad mold areas during application.
• Mild thixotropy helps the material stay in place on vertical surfaces during bag construction.

This material fits composite shops that want reusable silicone vacuum bags rather than single-use bagging film on repeated parts. It is especially useful when the same mold runs often enough to justify a dedicated bag.

QVB 720 silicone Applications

• Reusable vacuum bags for resin infusion composite molding.
• Production molds that need repeatable bag fit and reduced disposable film use.
• Composite parts with shape details that benefit from flexible silicone bagging.
• Aerospace, marine, transportation, and industrial composite molding programs.
• Prototype molds where bag visibility helps technicians confirm coverage.

Surface Preparation And Use Notes

Clean the mold surface and flange area before applying silicone. Remove dust, release residue, oil, and loose fiber. Build the bag according to the current technical data and any reinforcement or seal requirements in the process plan.

Confirm cartridge dispensing equipment, mix ratio, working time, and cure schedule before coating the actual mold. On a new process, make a small test panel first so the team can check thickness, cure, release, and vacuum performance before committing to a production tool.

Technical Details And Documentation

CHT describes QVB 720 as a two-part molding silicone for reusable vacuum bags, with transparent purple cured sections, fast gel time, tear and elongation properties, self-leveling flow, and mild thixotropy. Review current manufacturer information from CHT Group before approving a bagging process.

Ordering Help

For related silicone molding materials and casting supplies, browse Chemical Concepts molding materials. For help matching cartridge size, dispensing equipment, and reusable bag process, call (800) 220-1966 or email [email protected].