When Is the Best Time to Demold GRC Components? Qinglong's GRC Demolding Time Control Standards

The demolding time of GRC components is determined by strength development, with the optimal demolding strength being 15-20MPa. At a normal ambient temperature of 20℃, ordinary components require 18-24 hours of curing, extended to 36-48 hours in winter. Insufficient demolding strength (below 10MPa) leads to chipped edges and corners, while over-curing (above 24MPa) increases demolding difficulty.

Experimental data show that when the demolding strength is 15MPa, the edge and corner integrity of components reaches 98%; at 10MPa, the damage rate rises to 12%. One art component, demolded prematurely (strength of only 8MPa), suffered a 30% damage rate in relief details, with rework losses exceeding RMB 50,000. In contrast, projects that strictly control demolding strength according to Qinglong GRC standards achieve a component yield rate of 99.5%.

Strength Testing Methods

Same-condition cured test block strength ≥15MPa; rebound hammer test mean ≥15MPa; these methods determine the timing.

Temperature Impact Correction

For every 5℃ drop in temperature, the demolding time is extended by 1/3; these corrections adapt to the environment.

Component Type Differences

Flat panel components can be demolded at 15MPa; complex components require ≥18MPa; these differences should be handled differently.

Demolding Operation Standards

Remove the side molds first, then the bottom mold; use dedicated release agents; these standards prevent damage.

Demolding timing requires scientific judgment. Control under Qinglong GRC standards ensures component integrity.