RGD-resistant compounds must also resist zinc bromide and cesium formate completion fluids. Weighting agents at 19.2 ppg attack standard fillers. New silica-only reinforcement systems maintain RGD performance after 30 days immersion at 180°C in 19.2 ppg ZnBr₂ without hardness increase or cracking. https://globalsealstech.com/product/rgd-rapid-gas-decompression-o-rings/