{"id":3759,"date":"2026-04-21T11:02:39","date_gmt":"2026-04-21T03:02:39","guid":{"rendered":"https:\/\/www.handashielding.com\/?p=3759"},"modified":"2026-04-21T11:13:51","modified_gmt":"2026-04-21T03:13:51","slug":"how-to-choose-the-right-spiral-tube-for-emi-shielding-a-complete-selection-guide","status":"publish","type":"post","link":"https:\/\/www.handashielding.com\/ru\/how-to-choose-the-right-spiral-tube.html","title":{"rendered":"How to Choose the Right Spiral Tube for EMI Shielding: A Complete Selection Guide"},"content":{"rendered":"

Learn how to choose the right EMI shielding spiral tube for your application. This complete guide covers shielding effectiveness, material options (beryllium copper, stainless steel, Hastelloy), compression force, groove design, and selection criteria for semiconductor, medical, and telecom equipment.<\/p>\n\n\n\n

Introduction: Why the Right Spiral Tube Matters<\/h2>\n\n\n\n

Electromagnetic interference is no longer a niche concern. From semiconductor wafer fabs and medical imaging suites to telecom base stations and military avionics, EMI can corrupt signals, degrade performance, and even cause system failures. The shielding gasket you choose sits at the seam of your enclosure\u2014the single most vulnerable point for EMI leakage.<\/p>\n\n\n\n

Among all shielding solutions, the\u00a0\u0441\u043f\u0438\u0440\u0430\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u043a\u0430<\/a><\/strong>\u00a0(also called spiral shield gasket or metal spiral EMI gasket) stands out. Its unique helical winding structure provides multiple points of continuous electrical contact, creating a robust Faraday cage effect across seams, doors, and removable panels<\/a>. But with multiple material options, force ratings, and installation variables, how do you choose the right one?<\/p>\n\n\n\n

\"\u042d\u043b\u0435\u043a\u0442\u0440\u043e\u043c\u0430\u0433\u043d\u0438\u0442\u043d\u044b\u0435<\/figure>\n\n\n\n

This guide walks you through a systematic selection process\u2014from defining your application requirements to final validation.<\/p>\n\n\n\n

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Step 1: Define Your Application Requirements<\/h2>\n\n\n\n

Before evaluating any product specifications, you must clearly define your operating environment. The wrong material in the wrong environment will fail\u2014often catastrophically.<\/p>\n\n\n\n

Key Questions to Answer<\/h3>\n\n\n\n
\u0420\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0435\u043d\u0438\u0435<\/th>What to Ask<\/th><\/tr><\/thead>
Shielding Need<\/strong><\/td>What frequencies need attenuation? 1 MHz? 10 GHz?<\/td><\/tr>
Shielding Effectiveness Target<\/strong><\/td>What dB level is required? 60 dB? 100 dB? 165 dB?<\/td><\/tr>
\u0414\u0438\u0430\u043f\u0430\u0437\u043e\u043d \u0442\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440<\/strong><\/td>What are the min\/max operating temperatures?<\/td><\/tr>
Corrosive Exposure<\/strong><\/td>Will the gasket contact chlorides (marine), acids (chemical plants), or moisture?<\/td><\/tr>
Compression Cycles<\/strong><\/td>Is the enclosure opened frequently (high cycle) or rarely (static)?<\/td><\/tr>
Closure Force<\/strong><\/td>Does the design require low closure force?<\/td><\/tr>
Galvanic Compatibility<\/strong><\/td>What metal is the mating enclosure (aluminum, steel, etc.)?<\/td><\/tr>
Environmental Seal Needed<\/strong><\/td>Must the gasket also block dust, moisture, or liquids?<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

The \u201c60\u2013120 dB Rule\u201d<\/h3>\n\n\n\n

Most commercial equipment requires shielding effectiveness between 60 and 120 dB<\/a>. General industrial applications often target 60\u2013100 dB, while aerospace, military, and medical equipment may demand 100 dB or higher<\/a>. High-end spiral tubes can achieve up to 165 dB\u2014far beyond standard requirements<\/a>.<\/p>\n\n\n\n

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Step 2: Understand the Key Performance Metrics<\/h2>\n\n\n\n

2.1 Shielding Effectiveness (SE)<\/h3>\n\n\n\n

Shielding effectiveness measures how much electromagnetic energy the gasket attenuates, expressed in decibels (dB). Higher dB means better shielding.<\/p>\n\n\n\n

SE Level<\/th>Attenuation<\/th>Typical Application<\/th><\/tr><\/thead>
60 \u0434\u0411<\/td>99.9%<\/td>Commercial electronics, general industrial<\/td><\/tr>
100 \u0434\u0411<\/td>99.99999%<\/td>Aerospace, military, medical devices<\/td><\/tr>
165 \u0434\u0411<\/td>~99.99999999999997%<\/td>Semiconductor equipment, mission-critical systems<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Spiral tubes typically deliver 86\u2013165 dB depending on design and material. The shielding quality may vary with frequency, with peak performance often at lower frequencies like 1 GHz.<\/p>\n\n\n\n

2.2 Compression Force and Resilience<\/h3>\n\n\n\n

Spiral tubes are available in different force ratings to match your closure force requirements.<\/p>\n\n\n\n

Force Series Overview<\/strong>:<\/p>\n\n\n\n

Force Series<\/th>Compression Force (OD 3.2mm, 25% comp)<\/th>\u0422\u0438\u043f\u0438\u0447\u043d\u043e\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435<\/th><\/tr><\/thead>
Standard Force (S Series)<\/td>~4.8 \u00b115% Kgf\/in<\/td>General industrial, balanced performance<\/td><\/tr>
Medium Force (M Series)<\/td>~2.0 \u00b115% Kgf\/in<\/td>Moderate sealing pressure<\/td><\/tr>
Low Force (L Series)<\/td>~0.4 \u00b115% Kgf\/in<\/td>Precision equipment, sensitive applications<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Data sources:<\/a><\/a><\/p>\n\n\n\n

Important<\/strong>: For standard spiral tubes (cordless), the spring force is primarily a function of strip thickness\u2014the force is proportional to the cube of the thickness<\/a>. For designs requiring higher compression force with better over-compression protection, inner cord (core) options such as solid silicone, silicone tube, or silicone foam are available<\/a>.<\/p>\n\n\n\n

2.3 Optimal Compression<\/h3>\n\n\n\n

The recommended compression for spiral tubes is 25% of the spiral diameter<\/strong><\/a><\/a>. Operating outside this range degrades performance:<\/p>\n\n\n\n