Guzhan | Custom Silicone Solutions – For Your Brand
High-Temperature Silicone Cone Plugs for Powder Coating
We manufacture silicone cone plugs designed for powder coating, anodizing, e-coating, and spray painting. These heat-resistant covers protect threads, holes, studs, and surfaces from coating overspray, ensuring clean, sharp lines and reducing post-process cleaning.Unlike straight plugs, our cone design fits a range of hole sizes with a single plug — reducing your inventory SKUs and simplifying selection.
Why industrial buyers choose our masking solutions:
| Comparison item | Other supplier | Guzhan |
| Temperature resistance range | ≤200°C | ≤300°C |
| MOQ | 10,000 pcs | 1,000 pcs |
| Sample time | 15-20days | 7-10days |
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Heat resistance – Withstand up to 300°C (600°F) in curing ovens
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Reusable – Flexible silicone allows multiple uses without tearing
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Custom sizes – From 1mm to 100mm ID, cone or straight
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Type Inner diameter range Application Masking Cap 1mm-60mm Bolts, studs, pipe ends, rods, and other external protruding parts Cone Plug 1mm - 100mm Cone design fits multiple hole sizes — reduces inventory SKUs Thread Plug 1mm - 50mm Protects internal threads from overspray — for M2-M20 threaded holes Pull Plug 1mm - 30mm For through-hole, nut protection -
Custom colors – Match your production line coding
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Custom shapes – Thread, pull tab, tapered, cone, or disc
- The unique differentiating of Cone Plug:
Conical design: A size that fits multiple aperture sizes, reducing inventory SKUs
Self-locking effect: The tighter you push, the more secure it becomes, and it will not come off.
Easier insertion: The conical tip is smaller, making it easier to install than the straight cylindrical cap. -
Common applications:
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Automotive parts (bolt holes, threaded studs)
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Aerospace components (critical unpainted areas)
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Industrial fasteners and hardware
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Electronics housings and connectors
Material: High-grade silicone, no melting or deformation at curing temperature. Not for use with solvent-based coatings without testing.
Need a specific size?
Send us your hole diameter, thread size, or part drawing. We‘ll recommend the best plug type and provide a sample within 7 days.Low tooling cost, refundable upon bulk order.
Success Story: Automotive Parts Manufacturer
Challenge: Needed protective plugs for M6 threaded holes in a 600°F coating line.
Our Solution: Custom conical silicone plugs, reusable 5+ times.
Result: 300,000 pcs/year, zero complaints..
MOQ from 1,000 pcs per design. Sample in 7-10 days.