New DIN Standards for Pressure Pipes: What It Means for PEX Press Fittings

Introduction

The recent recognition of PP-RCT material in DIN standards for water pressure pipes marks a significant evolution in plumbing technology. While this development primarily concerns polypropylene systems, it raises important questions about parallel advancements in PEX press fittings – the dominant solution for modern plumbing installations.

This article examines:

Key changes in the updated DIN standards
How PEX press fittings compare to PP-RCT systems
Implications for specifiers and installers

Understanding the New DIN Standards

DIN 8077/8078 Updates (2024)

Recognizes PP-RCT (Polypropylene Random Crystallinity Temperature) as a premium pipe material
Establishes new pressure ratings:
- PN 20 (20 bar at 20°C)
- PN 25 (25 bar at 20°C)
Expands temperature range to 95°C continuous operation

Comparison: PP-RCT vs. PEX Press Fittings

Parameter	PP-RCT	PEX Press Fittings
Max Temperature	95°C	90°C
Pressure Rating	PN 25	16 bar
Installation Method	Heat fusion	Mechanical press
Freeze Resistance	Moderate	Excellent
Material Cost	$$	$$$
Labor Cost	$	$$

Why PEX Press Fittings Remain Competitive

1. Installation Efficiency

50% faster than PP-RCT fusion welding
No hot work permits required
Reversible connections available (some systems)

2. Material Advantages

Superior flexibility (bend radius = 8× OD)
No thermal expansion joints needed up to 30m runs
Proven 50+ year lifespan in field applications

3. Evolving Standards

DIN 16892/16893 updates for PEX-AL-PEX
New DIN SPEC 12211 for press connection systems

Best Practices for PEX Press in High-Pressure Systems

1. System Design Considerations

Use PEX-AL-PEX for PN 20+ applications
Include expansion loops every 20 feet
Specify brass press fittings for critical connections

2. Quality Assurance

Third-party certification (DVGW, KIWA, NSF)
Batch testing of fittings (per EN ISO 15875)
Annual tool calibration requirements

5 FAQs About PEX Press Fittings and New Standards

1. Are PEX press fittings compliant with the new DIN standards?

Yes – when installed per DIN 4726 for plastic piping systems.

2. Can PEX press systems achieve PN 25 ratings?

Only PEX-AL-PEX multilayer systems meet PN 25 when properly designed.

3. How do material costs compare between PP-RCT and PEX?

PEX press systems cost 20-30% more but save 40% in labor.

4. Is special training required for PEX press installations?

Yes – most manufacturers require certification courses (8-16 hours).

5. Will PP-RCT replace PEX in commercial applications?

Unlikely – each has niche advantages (PEX for retrofit, PP-RCT for industrial).

Industry Outlook

2025 Projection: 15% growth in PEX press for high-rise buildings
Technology Trends:
- Smart press tools with connection verification
- Biofilm-resistant PEX formulations
- Thinner PEX-OB with maintained pressure ratings

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