Products Description
|
Product Name |
Silicone End Cap |
|
Product Form |
Hollow cylindrical cap, one closed end, one open end, elastic sleeve structure |
|
Size Range |
Fits tube outer diameters from 3.5mm to 105mm; 63 size variants available |
|
Primary Use |
Heat pump and air conditioner copper pipe end protection, dust and contaminant blocking, pre-brazing pipe protection, temporary dust sealing |
|
Key Features |
External clamping on tube OD; shields against dust and particulates; quick on/off application; withstands process heat; ideal for pre-weld staging |
|
Material |
Silicone (high-elasticity rubber material) |
|
Application Scenarios |
Heat pump assembly, air conditioning pipe processing, copper tube storage and transfer, incoming material protection, laboratory sealing tests |
|
Installation Method |
Push-on type: Slip directly over the copper tube outer diameter from outside; silicone elasticity grips the tube wall securely. Not an insertion-type plug |
|
Core Advantages |
Push-on installation with no debris contamination risk; comprehensive size range with ready stock; no residue after removal; heat resistant; reusable; maintains pipe internal cleanliness |
|
Certifications |
ROHS, REACH, ISO9001 |
Product Advantages
1. No Internal Contact – No Contamination Risk
Because the cap fits over the tube's exterior, it never contacts the internal flow path. This design choice completely eliminates the possibility of rubber fragments entering the system-a decisive advantage for heat pump and air conditioning manufacturers who prioritize internal cleanliness before welding.
2. Extensive Selection – 63 Sizes, 3.5–105mm
The product line covers nearly every common tube dimension. With 63 individual sizes available, you can match the cap precisely to your tube's outer diameter. Our inventory strategy ensures that high-demand sizes are ready for immediate shipment, minimizing downtime.
3. Withstands Heat, Easy to Use, Built to Last
Formulated from heat-stable silicone, the cap endures routine process temperatures and brief thermal spikes near brazing without softening or deforming. At the same time, its elasticity ensures effortless application-just slide it on, and it stays. When work is complete, it pulls off just as easily, and if still intact, it goes back into service for the next cycle.
4. Shields Against Dirt, Chips, and Foreign Matter
A secure external barrier keeps dust, metallic particles, and shop-floor debris from settling on tube ends. This preventive measure helps avoid blocked capillary tubes, poor weld joints, and downstream equipment problems that can arise from internal contamination.
Installation Instructions
Select the Right Size
Measure the outside diameter of the tube you intend to protect, then choose the cap size that corresponds to that measurement.
Fit the Cap
Hold the cap over the tube end and press it on until the cap is fully seated. A proper fit will hold firmly around the tube without being loose.
Remove When Ready
When the tube has completed storage, testing, or pre-brazing staging, take hold of the cap and pull it straight off. The cap can be saved for reuse if it remains undamaged.
Application Scenarios & Precautions
Application Scenarios
- Heat Pump Production Lines: Copper tube semi-finished product storage, transfer, and pre-brazing dust protection
- Air Conditioning & Refrigeration Pipe Processing: Incoming copper tube protection
- Pipe Sealing & Contamination Testing: Dust protection during testing procedures
- Metal Tube Warehousing: Preventing debris from entering pipe cavities during storage
- Industrial Machinery & Fluid Pipe Ends: Temporary port protection for various pipe applications.
Precautions
- Fit Matters – Select your cap size using the tube's measured outside diameter. Caps that are too large will not stay in place; caps that are too small may be hard to fit or could stress the material.
- Know Its Limits – This is a temporary protective cover, not a pressure seal. It is not designed to contain gas or liquid pressure within a system.
- Heat Precautions – Avoid exposing the cap to open flames or direct torch heat. While it handles elevated ambient temperatures well, direct brazing flame will cause carbonization and material breakdown.
- Check Before Use – Give the cap interior a quick visual check before fitting. Remove any loose particles that could transfer to the tube surface.
- Replace When Worn – Cracking, hardening, or loss of springiness are signs of material aging. Caps in this condition should be discarded, as they no longer provide reliable protection.
Performance Comparison
| Feature |
Silicone End Cap |
Insert-type Silicone Plug |
| Fitting Approach |
Slides over the copper tube outer wall |
Inserts into the copper tube opening |
| Internal Cleanliness Risk |
Minimal-no contact with internal wall |
Risk of debris or fragments falling into the pipe |
| Sizing Reference |
Matches tube outer diameter |
Matches tube inner diameter |
| Application & Extraction |
Pull off directly-simple and quick |
May require force; risk of wear |
| Recommended Application |
Preferred for heat pump/AC applications requiring high pipe cleanliness before brazing |
Hole sealing and blanking-not recommended for high-cleanliness pipe applications |
Company Profile
Founded in 1987, Langfang Ruidi New Material Technology Co., Ltd. is a specialized manufacturer of high-performance rubber sealing and vibration-damping components. With over three decades of industry experience, we serve a diverse clientele across air conditioning, refrigeration, automotive, plumbing, and general machinery sectors. Our commitment to quality and reliability has earned us long-term partnerships with numerous leading brands both domestically and internationally.
Why Partner With Us
- Standards-Driven Engineering – Our technical team brings deep expertise in rubber product development, with direct involvement in the formulation of national industry standards for sealing components.
- End-to-End Quality Assurance – Every production stage, from raw material inspection to final product testing, is monitored through our in-house laboratories to guarantee batch-to-batch consistency and performance reliability.
- Global Trust – Exporting to more than 15 countries-including the USA, Japan, Germany, Brazil, and Southeast Asian markets-we understand and adapt to diverse technical specifications and compliance frameworks worldwide.
why choose our products?
External-Fitting Design – Zero Internal Contamination – The cap slips over the tube exterior rather than entering the bore, completely eliminating the risk of rubber particles migrating into the system-the clear choice for pre-brazing protection.
63 Sizes, 3.5–105mm, Ready to Ship – Comprehensive size coverage with popular models held in stock, enabling fast turnaround without custom tooling delays.
Built to Last – Heat-Resistant and Reusable – Premium silicone withstands elevated temperatures near brazing, while the durable construction allows repeated use across multiple production cycles, driving down per-unit costs.
Tianjin Ruidi International Trade Co., Ltd
Langfang Ruidi New Material Tecnology Co.,LTD
Our address
3001 Maoye Building, Haihe East Road, Hebei District, Tianjin 300140 P.R.China
Phone Number
+86 189 0205 0338
topsales@rubberproduct.net
Inner Pursuit . Altruism Green · Resilience
FAQ
Q1: Do I need to take the cap off before brazing?
Q2: How secure is the fit during handling and transit?
Q3: Are custom sizes or colors available?
Q4: Which material is better-silicone or EPDM-for end cap use?
Hot Tags: silicone end cap, China silicone end cap manufacturers, suppliers, ac indoor unit water plug for floor standing air conditioner, cutless rubber bearing, firewall wire harness grommet, neoprene bridge bearing, rubber bearing bridge, rubber mounted bearings
