Ammonia-resistant best FFKM O-rings seals survive anhydrous NH3 and ammonium hydroxide to 200°C. Zero cracking or swelling after 1000-hour immersion. Ideal for refrigeration and fertilizer plants. Maintenance teams rely on the best FFKM O-rings seals that end frequent replacements in ammonia service. https://globalsealstech.com/ffkm-seals/