Anodizing processes subject masking components to acid bath immersion, alkaline pre-treatment, and rinsing stages. Standard catalogue caps may not seal reliably around non-standard stud profiles or irregular component geometries, leading to anodizing of surfaces that must remain bare metal for functional or assembly reasons.

Our custom silicone masking caps for anodizing are moulded to your exact component geometry and manufactured from silicone grades that resist the acid chemistry of standard anodizing baths. Each cap is designed for secure retention through immersion and clean removal without residue on critical mating surfaces.

All custom caps are produced with a smooth inner surface to ensure consistent sealing against the masked component. For applications involving threaded studs, custom threaded silicone caps are available to protect thread geometry through the anodizing process.

Key properties and configurations:

• Acid and chemical resistant: suitable for sulphuric acid anodizing baths, chromic acid processes, and alkaline pre-treatment stages
• Customisable hardness: Shore hardness selectable to match compression fit, retention under immersion, and sealing performance
• Any geometry: round, square, hexagonal, flanged, and complex non-standard profiles available to drawing or sample
• Reusable and durable: high-quality silicone construction supports repeated use across multiple anodizing cycles without degradation of fit or chemical resistance
• Colour-coded to specification: any silicone colour available to support operator identification and process control
• Economical for small series: custom tooling is viable even for smaller quantities where no standard masking cap provides a reliable fit for your component

Lead time is typically 3 to 4 weeks from approved geometry.