CHEMICAL FUSION VERIFICATION

ISO 9852 & DIN 8061 Methylene Chloride Immersion (Degree of Gelation)

The degree of gelation (fusion level of polyvinyl chloride molecular chains) is a fundamental indicator of thermoplastic pipe mechanical integrity, impact resistance, and long-term durability. In accordance with ISO 9852 and DIN 8061, ALFA Quality Control engineers immerse representative chamfered pipe rings in analytical grade methylene chloride (CH₂Cl₂) at 15°C ± 1°C for 30 minutes.

ISO 9852 Test Conditions & Acceptance Criteria

• Reagent: Dichloromethane (Methylene Chloride) ≥ 99.5% Purity

• Bath Temperature: Controlled at 15.0°C ± 0.5°C

• Immersion Time: 30 Minutes Continuous

• Acceptance Standard: Zero delamination, Zero flaking, Zero structural attack

• Tested Dimensions: Metric (DIN 8062/19534) and Imperial (ASTM D1785)

• Sampling Frequency: Every extrusion run startup & every 8-hour production shift

Production Lot	Product Specification	Immersion Temp	Duration	Visual Examination	Conformity Status
LOT-2026-0881	DIN 8062 PN 16 (160mm OD)	15.0°C	30 Mins	0% surface attack, No delamination, Smooth chamfer	CONFORMS (100% GELATION)
LOT-2026-0882	DIN 19534 SN8 (200mm OD)	15.0°C	30 Mins	0% surface attack, No flaking, Homogeneous wall	CONFORMS (100% GELATION)
LOT-2026-0883	ASTM D1785 Sch 80 (4" IPS)	15.0°C	30 Mins	0% surface attack, Completely intact internal bore	CONFORMS (100% GELATION)

Why Degree of Gelation Protects Infrastructure

Under-gelated PVC pipes contain un-fused polymer grains, creating micro-voids susceptible to environmental stress cracking under soil overburden and cyclic water hammer surges. By enforcing 100% molecular fusion through twin-screw high-shear extrusion, ALFA pipes eliminate premature fatigue failure and ensure a guaranteed 50+ year design life.

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Direct technical answer: Methylene Chloride Gelation Test

This engineering resource explains Methylene Chloride Gelation Test for designers and reviewers. Use it to clarify definitions, methods, and limitations—then apply project-specific data.

Method, assumptions, and limits

Document formulas and variable definitions when performing calculations. Call out where soil modulus, temperature derating, or surge dominates the result. Link outcomes back to product standards and application hubs for procurement.

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Frequently asked questions

What information is needed to quote Methylene Chloride Gelation Test?

Standard, size/pressure class, jointing system, quantities/lengths, fittings list, delivery location, and any submittal/test requirements from the specification.

Can I substitute one pipe standard for another at the same nominal size?

Not without review. Dimensions, pressure classes, and test methods differ across standard families.

How do I contact ALFA for supply?

Use the RFQ form or contact +966 50 183 5126 / sales@alfaalarabia.co. Manufacturing is based at 3rd Industrial City, Jeddah, Kingdom of Saudi Arabia (Aramco Vendor #10116102).

Related resources

Batch-1 knowledge update: ALFA-specific order data must come from approved submittals—this section does not invent ratings or certifications.