PTFE Cap is a machined or molded component made from polytetrafluoroethylene (PTFE) for covering, closing, protecting, or connecting containers, tubes, fittings, and other equipment components. PTFE provides excellent resistance to many corrosive chemicals, very low moisture absorption, and a non-metallic contact surface for chemically demanding applications.
JIAFUXIN manufactures custom PTFE caps in different diameters, heights, wall thicknesses, internal structures, and connection designs. Threaded, non-threaded, slip-on, and drawing-specific PTFE caps can be manufactured for laboratory, chemical-processing, semiconductor, and industrial equipment.
PTFE Cap Specifications
| Property | Specification |
|---|---|
| Material | PTFE / Polytetrafluoroethylene |
| Product Type | Cap / Cover / End Cap |
| Color | Natural White |
| Outside Diameter | 20, 25, 30, 40, 50, 60, 80, 100 mm/Custom |
| Inside Diameter | 10, 15, 20, 25, 30, 40, 50, 60 mm / Custom |
| Height | 15, 20, 25, 30, 40, 50, 60 mm / Custom |
| Wall Thickness | 2, 3, 4, 5, 6, 8, 10 mm /Custom |
| Thread | Threaded / Non-Threaded / Custom |
| Internal Structure | Custom |
| Connection | According to Drawing |
| Manufacturing | Machined / Molded |
| Drawing-Based Production | Available |
| Sample-Based Production | Available |
For replacement caps or equipment-specific components, a drawing or sample is recommended to confirm the mating dimensions and connection structure.
PTFE Threaded Cap
PTFE Threaded Caps are manufactured with internal or external threads to match bottles, containers, tubes, fittings, or equipment connections.
Thread specifications can be machined according to the mating component or customer drawing.
For a custom threaded PTFE cap, important dimensions include:
- Thread type
- Thread size
- Inside diameter
- Outside diameter
- Overall height
- Thread depth / engagement length
- Wall thickness
- Mating component dimensions
The thread specification should be provided rather than determined from the cap outside diameter alone.
Non-Threaded PTFE Cap
A non-threaded PTFE cap can be designed as a slip-on, press-fit, protective, or positioning component depending on the assembly.
These caps can be used to cover tube ends, protect equipment components, or provide a non-metallic barrier between the component and surrounding process environment.
Inside diameter and fit are particularly important for this type of cap and should be specified according to the mating part.
PTFE Bottle and Container Caps
PTFE caps can be manufactured for laboratory bottles, jars, containers, and chemical-handling vessels.
PTFE is useful for cap applications where the closure may be exposed to corrosive reagents or where direct metal contact with the stored material is undesirable.
Typical uses include:
- Laboratory bottles
- Chemical containers
- Reagent containers
- Sample containers
- PTFE jars
- Custom chemical vessels
- Process containers
For a replacement bottle or container cap, provide the neck dimensions and thread specification, or send a drawing/sample of the existing cap.
PTFE End Cap
PTFE End Caps can be used to close or protect the end of tubing, fittings, rods, equipment connections, or other components.
Depending on the application, the cap can be designed with:
- Straight internal bore
- Stepped bore
- Internal thread
- External thread
- Blind end
- Shoulder
- Flange
- Recess
- Other custom profiles
The structure can be CNC machined according to the mating component.
Why Use PTFE for Caps?
PTFE caps are commonly selected for chemically demanding applications because PTFE provides:
- Excellent resistance to many acids, alkalis, and solvents
- Very low moisture absorption
- Smooth, low-adhesion surface
- Non-metallic fluid-contact surface
- No rust or metal corrosion
- Excellent electrical insulation
- Custom machinability for complex cap profiles
Chemical compatibility should be confirmed according to the specific chemical, concentration, temperature, and service conditions.
Typical Applications
Custom PTFE caps can be used in:
- Laboratory equipment
- Chemical containers
- Reagent bottles
- Chemical-processing equipment
- Semiconductor wet-process equipment
- Fluid-handling systems
- Tubing and fitting assemblies
- Electrical equipment
- Sample containers
- Custom industrial machinery
The required PTFE cap design depends on what the cap needs to close, protect, or connect.
Custom PTFE Cap Sizes
JIAFUXIN manufactures custom PTFE caps according to drawings, samples, or mating-component dimensions.
Custom dimensions and features can include:
- Inside diameter (ID)
- Outside diameter (OD)
- Overall height
- Wall thickness
- Top thickness
- Internal depth
- Internal threads
- External threads
- Stepped bores
- Shoulders
- Flanges
- Grooves
- Recesses
- Other CNC-machined features
For a simple cap, provide the ID × OD × Height together with wall or top thickness where required.
For threaded or complex caps, a complete dimensional drawing is preferred
