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Home<\/a> \/ VHP Knowledge<\/span><\/div>\n VHP Knowledge Library<\/span>\n

Engineering guides for VHP bio-decontamination<\/h1>\n

Practical notes for the QA, validation and process engineers who have to plan, run and qualify a vaporized hydrogen peroxide process \u2014 materials, room preparation, aeration, cycle design, and the isolators VHP is used in.<\/p>\n<\/div><\/section>\n

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Cycle design \u00b7 5 min read<\/span>

Cleaning Before VHP: Why Bio-Decontamination Does Not Replace It<\/h3>

Why VHP needs clean surfaces, which residues interfere with it, and a practical cleaning-then-VHP sequence for rooms and isolators.<\/p>Read the guide \u2192<\/span><\/a>Troubleshooting \u00b7 6 min read<\/span>

Troubleshooting a Failed VHP Cycle: Symptoms, Causes and Fixes<\/h3>

From symptom to cause: dehumidification, concentration, condensation, BI growth, long aeration and leaks \u2014 and the order to investigate them.<\/p>Read the guide \u2192<\/span><\/a>Comparisons \u00b7 6 min read<\/span>

VHP vs Formaldehyde vs Chlorine Dioxide: Choosing a Room Fumigant<\/h3>

How formaldehyde, chlorine dioxide gas and VHP compare on efficacy conditions, cycle time, residues, materials and safety \u2014 and when each is used.<\/p>Read the guide \u2192<\/span><\/a>Isolators \u00b7 6 min read<\/span>

How to Write an Isolator URS: Sections, Example Requirements and Common Gaps<\/h3>

A section-by-section structure for an isolator URS, with examples of testable requirements and the gaps that cause problems later.<\/p>Read the guide \u2192<\/span><\/a>Isolators \u00b7 6 min read<\/span>

Environmental Monitoring in Isolators: Particles, Viables and the VHP Problem<\/h3>

What to monitor in a Grade A isolator, where to place samplers, and how residual hydrogen peroxide can affect viable monitoring.<\/p>Read the guide \u2192<\/span><\/a>Isolators \u00b7 6 min read<\/span>

Isolator Airflow Visualisation: How to Plan and Judge a Smoke Study<\/h3>

How to plan, film and judge an airflow visualisation (smoke) study in an isolator, including interventions through gloves.<\/p>Read the guide \u2192<\/span><\/a>Isolators \u00b7 6 min read<\/span>

Isolator FAT and SAT: What to Check Before Shipment and on Site<\/h3>

What an isolator factory acceptance test and site acceptance test should cover, with a practical checklist and how both feed into IQ\/OQ.<\/p>Read the guide \u2192<\/span><\/a>Isolators \u00b7 6 min read<\/span>

Hydrogen Peroxide Uptake in Isolator Filling: Protecting Sensitive Products After VHP<\/h3>

Why residual H\u2082O\u2082 after an isolator VHP cycle can reach the product, which drugs are sensitive, and how to measure and reduce uptake.<\/p>Read the guide \u2192<\/span><\/a>Isolators \u00b7 8 min read<\/span>

Isolator Glove Integrity Testing: Methods, Frequency and What to Do After a Breach<\/h3>

How isolator gloves are inspected and leak tested, how often, how VHP affects them, and how to handle a failed glove.<\/p>Read the guide \u2192<\/span><\/a>Cycle design \u00b7 6 min read<\/span>

Preparing a Room for VHP Decontamination: Sealing, HVAC Isolation and Placement<\/h3>

Defining the boundary, sealing and HVAC isolation, generator and fan placement, indicators, and a practical checklist.<\/p>Read the guide \u2192<\/span><\/a>Safety \u00b7 6 min read<\/span>

VHP Aeration: Getting Back to Safe H\u2082O\u2082 Levels Before Re-entry<\/h3>

Exposure limits, why residual H\u2082O\u2082 lingers, sensor choice, and what really shortens aeration time.<\/p>Read the guide \u2192<\/span><\/a>Materials \u00b7 6 min read<\/span>

VHP Material Compatibility: What Can Go Into a Hydrogen Peroxide Cycle<\/h3>

Which materials tolerate H\u2082O\u2082 vapour, which absorb it and spoil the cycle, and how to test a load before qualification.<\/p>Read the guide \u2192<\/span><\/a><\/div>\n<\/div><\/section>\n

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More reading<\/span>

Fundamentals on fenggu-bio.com<\/h2><\/div>\n
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The basics of VHP are covered on our main site: what VHP decontamination is<\/a>, biological indicators and the 6-log reduction<\/a>, cycle development and IQ\/OQ\/PQ<\/a> and EU GMP Annex 1<\/a>.<\/p>\n

Reference: the English\u2013Chinese VHP glossary<\/a> (66 terms), a standards quick reference<\/a> and free engineering calculators<\/a> for isolator leak rate, aeration time and equipment selection.<\/p>\n <\/div>\n<\/div><\/section>\n\n

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Free application review<\/span>

Have a question these guides do not answer?<\/h2>

Describe the space or equipment and what you need to achieve. An engineer will reply.<\/p><\/div>\n

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