Shanxi Kaisheng Plastic Co., Ltd. is one of the most reliable manufacturers and suppliers of coupling fittings in China. Please feel free to buy CE approved coupling fittings in stock here from our factory. All customized products are with high quality and competitive price. Contact us for quotation.
Product Overview
Coupling Fittings are used to connect two PP-R pipes of the same diameter in water supply and plumbing systems. Manufactured by injection moulding, the coupling provides a socket-fusion connection between the fitting and pipe.
Technical Specifications
|
Parameter |
Available Information |
|
Material |
PP-R |
|
Size Range |
20–63 mm / Custom sizes |
|
Connection |
Socket Fusion |
|
Shape |
Round |
|
Manufacturing Process |
Injection Moulding |
|
Application |
Water Supply / Hot & Cold Water |
|
Color |
Green / White / Grey / Custom |
|
Packaging |
Carton / Customized |
|
OEM |
Available |
Size Matrix
|
Item Code |
Size (mm) |
Wall Thickness (mm) |
Pressure Rating (PN) |
Standard Packing (PCS/Carton) |
|
SPC-20 |
20 |
3.4 |
PN20 / PN25 |
500 |
|
SPC-25 |
25 |
4.2 |
PN20 / PN25 |
350 |
|
SPC-32 |
32 |
5.4 |
PN20 / PN25 |
200 |
|
SPC-40 |
40 |
6.7 |
PN20 / PN25 |
120 |
|
SPC-50 |
50 |
8.3 |
PN20 / PN25 |
70 |
|
SPC-63 |
63 |
10.5 |
PN20 / PN25 |
40 |
Socket Fusion & Field Application
PP-R coupling fittings rely on thermal socket fusion to create a permanent, leak-proof molecular bond between the pipe and fitting.
Connection Mechanism: The fitting socket and pipe exterior are heated simultaneously using standard socket fusion tools calibrated to 260°C. Inserting the pipe into the fitting forces the melted polymer surfaces to blend molecularly, forming an integrated, monolithic pipeline structure.
Primary Application Sectors:
- Residential and commercial hot and cold potable water plumbing networks.
- Closed-loop radiant floor heating and central radiator distribution systems.
- Industrial fluid transport lines carrying mild chemical solutions within allowable pH ranges.
Material Integrity & Manufacturing Standards
100% Virgin PP-R Resin: We utilize random copolymer polypropylene (PP-R Type 3) sourced from certified international petrochemical suppliers. No recycled plastics or secondary regrind materials are mixed into production batches, preventing structural degradation under thermal stress.
Precision Injection Molding: Controlled melt temperature and high-pressure injection parameters ensure uniform wall thickness, minimizing ovality and maintaining strict socket diameter tolerances for reliable thermal fusion.
Batch Inspection: Each production run undergoes dimensional profiling, melt flow index testing, and thermal stability checks prior to packaging.
Technical Insights: Avoiding Socket Fusion Failures
Thermal Timing ControlAvoid Over-Heating: Exceeding the 5-second window at 260℃ causes inner-bead polymer accumulation, restricting water flow.
Avoid Under-Heating: Insufficient heating prevents complete molecular fusion. Always adhere to calibrated socket depth markers.
Axial Alignment
Straight Insertion: Pipes must be inserted into the coupling straight along the axial line.
Prevent Twisting: Twisting during insertion disturbs the molten polymer matrix and creates micro-voids prone to long-term leaks.
OEM, Customization & Supply Chain Support
Color Customization: Standard green and grey, with white or custom hues available upon volume request.
Permanent Laser Marking: Factory branding, size indicators, and production batch codes are laser-etched directly onto the fitting body for complete traceability.
Flexible Logistics & MOQ: Stable manufacturing capacity supports scheduled container shipments with dependable lead times (standard orders ship within 15–25 days).
Frequently Asked Questions
Q: Can we request custom branding or laser printing on the fittings?
A: Yes. We offer permanent laser marking to print your brand logo, size specifications, and production batch codes directly onto the fitting body for inventory tracking.
Q: How do you handle shipping logistics and container space optimization?
A: We offer mixed-container loading (LCL/FCL). You can combine couplings with matching PP-R pipes, elbows, and tees to maximize freight efficiency and reduce shipping costs.
Q: What are your standard export payment terms?
A: We typically accept T/T (Telegraphic Transfer) with a 30% advance deposit and the remaining balance paid against the copy of the Bill of Lading, though terms can be discussed for long-term projects.
Q: Do you provide third-party inspection reports before shipment?
A: Yes. We support pre-shipment inspections (PSI) conducted by independent inspection agencies (such as SGS or BV) designated by your procurement team.
Q: What is the shelf life and storage requirement for PP-R fittings?
A: Store in a cool, shaded area away from direct UV sunlight. When kept in original packaging in a dry warehouse, PP-R fittings maintain their material integrity for years.
Q: What color options are available, and do they affect performance?
A: Standard options include green, grey, and white. Color pigments do not alter the physical or mechanical performance of the virgin PP-R resin.
Q: How are the fittings packaged for international freight?
A: They are packed in heavy-duty inner polybags and reinforced corrugated master cartons to prevent transit deformation during long-distance maritime shipping.
Q: Can these couplings be used for compressed air or industrial gas lines?
A: No. PP-R piping systems are designed strictly for water supply and fluid transport; they are not certified for compressed air or gas distribution.
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