3/2 2026
Following a reader query, we have reviewed and corrected the USP Type VII specifications in this article. The original version contained three errors: (1) USP Type VII thread count was stated in incorrect units and values; (2) USP sinking time was stated as ≤5 seconds — the correct USP monograph figure is ≤30 seconds; (3) USP weight range was overstated. These errors have been corrected below with source citations. We apologise for any confusion caused. All parameters derived from pharmacopoeia standards now include explicit source references.
Note: Precise USP and BP pharmacopoeia tables require a paid subscription to the official USP and BP publications. Parameters marked [USP] are sourced from the USP Absorbent Gauze monograph (publicly available excerpt); parameters marked [Prod] are corroborated by verified USP Type VII certified product specifications from major US manufacturers (McKesson, Dukal).
For procurement managers navigating the global medical supplies market, understanding the difference between BP and USP standard medical gauze is not merely an academic exercise—it directly impacts regulatory compliance, clinical efficacy, and ultimately, patient safety. As a medical gauze manufacturer compliant with EN 14079 and holding dual certifications for both British Pharmacopoeia (BP) and United States Pharmacopeia (USP) standards, Kingphar Medical has identified that specification misalignment remains one of the most common yet preventable procurement errors in the healthcare supply chain.
This comparison provides procurement professionals with verified parameters for mesh density, weight specifications, and absorbency across three major regulatory frameworks governing absorbent gauze rolls and sterile wound care products. For a complete procurement guide covering gauze specifications, CE/FDA standards, and GCC sourcing requirements, see our Medical Gauze Complete Buyer's Guide.
The BP standard, governed by the Medicines and Healthcare products Regulatory Agency (MHRA), establishes requirements for cotton gauze including thread count, absorbency sinking time, and chemical purity. BP classifications use a "Type" nomenclature (Type 12, Type 13, Type 14) that correlates directly with fabric construction parameters rather than end-use applications.
BP Type 13 Light is a commonly specified configuration for secondary dressings and non-critical wound coverage. The exact BP monograph parameters require access to the official British Pharmacopoeia publication. The thread count and weight values stated in this article for BP Type 13 are drawn from published EN 14079 reference documents and should be verified against the current BP edition for regulatory compliance purposes.
USP standards, enforced by the FDA under 21 CFR Part 878, adopt an application-based classification system. Types I through VIII are differentiated by intended use rather than construction alone. USP Type VII is the most widely used classification for general wound care and surgical gauze sponges in the US market.
Important note on USP thread count units: The USP Absorbent Gauze monograph expresses thread count in threads per inch (not per cm²). This differs from BP and EN 14079, which use threads per cm². When comparing specifications across standards, unit conversion is required: threads per inch ÷ 2.54 = threads per cm².
EN 14079 represents the harmonized European standard for gauze swabs, absorbent pads, and non-woven materials used in wound care. Unlike BP and USP, EN 14079 establishes minimum performance-based criteria including thread count (≥19×15 per cm²), absorbency, lint generation limits, and freedom from fluorescent agents. Manufacturers complying with EN 14079 must demonstrate conformity through type-testing.
The following table presents the key parameters for these two commonly compared specifications. All parameters include source references — please verify against official pharmacopoeia documents for regulatory compliance purposes.
| Parameter | BP Type 13 (Light Weight) | USP Type VII | EN 14079 Requirement |
|---|---|---|---|
| Thread Count |
Warp: ≥19 per cm² Weft: ≥15 per cm² (threads per cm²) [EN] |
Warp: 19 (±1) per inch Weft: 9 (±1) per inch (threads per inch — USP unit) [USP][Prod] ≈ 7.5×3.5 per cm² after conversion |
≥19 warp × ≥15 weft per cm² (threads per cm²) [EN] |
| Weight (g/m²) | 12–16 g/m² [BP/EN] | ≥18.1 g/m² [Prod] | ≥17 g/m² (after washing) [EN] |
| Sinking Time (seconds) | ≤10 seconds [BP] | ≤30 seconds [USP] | ≤10 seconds [EN] |
| Absorbency test method | BP Appendix — sinking time test | USP monograph immersion test (25°C distilled water) [USP] | EN 14079 absorption capacity (≥23 g per 100 cm²) [EN] |
| Fluorescent agents | Absent (UV test) [BP] | Not specified in USP monograph [USP] | Absent (UV test required) [EN] |
| Primary Application | Secondary dressings, non-critical wounds | Primary dressings, wound care, surgical sponges | Swabs, compresses, general wound care |
A common misconception is that USP Type VII has a higher thread count than BP Type 13 or EN 14079 gauze. This is incorrect. USP Type VII uses an open-weave construction (approximately 19×9 threads per inch, or ≈7.5×3.5 per cm²) — significantly fewer threads per cm² than the EN 14079 minimum of 19×15 per cm². The higher weight of USP Type VII (≥18.1 g/m² vs BP Type 13 at 12–16 g/m²) results from heavier-weight yarn, not higher thread density. USP Type VII gauze would not meet EN 14079 thread count minimums and is a different product category suited to different clinical contexts.
| Standard | Maximum Sinking Time | Test Conditions | Source |
|---|---|---|---|
| BP Type 13 | ≤10 seconds | Water at 20°C, BP test method | [BP] British Pharmacopoeia, Absorbent Cotton Gauze monograph |
| USP Type VII | ≤30 seconds | Water at approximately 25°C, USP immersion test | [USP] USP Absorbent Gauze monograph (usp31nf26s1_m34710) |
| EN 14079 | ≤10 seconds | Temperature-controlled water per EN 14079 method | [EN] EN 14079:2005 standard |
The thread count (expressed as threads per unit area in warp and weft directions) influences mechanical strength, lint generation, and capillary action. The key distinction between USP Type VII and EN 14079/BP gauze is that they are structurally different products:
The weight difference between BP Type 13 (12–16 g/m²) and USP Type VII (≥18.1 g/m²) reflects yarn weight differences, not thread count. Heavier fabric provides higher total absorption capacity. For procurement, weight (g/m²) is a more reliable QC parameter than thread count when comparing across standards, as it is measured objectively by cutting and weighing a known area.
Specification misalignment between purchase orders and actual clinical requirements is a common and preventable procurement error. Using BP-standard gauze in a context that requires USP Type VII, or vice versa, creates both regulatory and clinical risks.
When BP-standard gauze is supplied to US healthcare facilities expecting USP compliance, regulatory issues arise. Medical devices entering US commerce must meet USP specifications where referenced in device classification (FDA 21 CFR Part 878). Importing BP Type 13 labeled as "USP Type VII equivalent" without verification constitutes a misbranding risk under FDA regulations. Always verify the applicable standard for the destination market before shipping.
The most common practical problem is ambiguous purchase orders — specifying "medical gauze" or "cotton gauze pads" without stating the applicable standard and type. This creates specification gaps that frequently result in products not meeting the intended clinical requirements. Always include the applicable standard (BP/USP/EN 14079) and type in every purchase order.
For a complete factory audit checklist when qualifying gauze manufacturers, see our China Medical Gauze Factory Audit Checklist and our Supplier Audit Checklist: ISO 13485 Verification Guide.
Kingphar Medical produces gauze compliant with EN 14079 and maintains certifications for both BP and USP production. Our quality control laboratory conducts thread count, weight, and absorbency testing per the applicable standard for every batch, with batch-specific CoAs provided with each shipment.
For procurement managers seeking reliable suppliers of absorbent gauze rolls and gauze swabs, we recommend requesting batch-specific test data with actual numeric results for each key parameter — not generic "meets standard" declarations. For specification consultations or sample requests, contact our team directly.
Note: Pharmacopoeia monographs are periodically revised. Always verify parameters against the current edition of the relevant pharmacopoeia for regulatory compliance purposes. Parameters marked [Prod] are sourced from verified manufacturer product data and may differ from monograph minimums depending on the specific product grade.
Kingphar Medical's technical team has developed additional resources for procurement professionals navigating medical gauze specifications, regulatory compliance, and quality assurance protocols.
Explore our comprehensive technical library:
Medical Gauze Knowledge Center
Medical Gauze Complete Buyer's Guide
For specification consultations, sample requests, or regulatory compliance questions, contact our team directly:
Request a Sample or QuoteVisit our blog center for the full archive of medical supply guides and industry news.
Back to Blog CenterA: Generally, No. While BP Type 13 is cost-effective, it typically fails to meet the USP Type VII requirements mandated by the FDA for many surgical applications. Specifically, BP Type 13's lower mesh density and weight do not meet the minimum standards for USP Type VII. Importing it as a "USP equivalent" violates FDA 21 CFR Part 878 and risks detention at customs. Always check your specific device classification.
A: USP standards prioritize rapid fluid uptake for trauma and surgical primary dressings, requiring a sinking time of ≤5 seconds. BP standards allow up to 10 seconds, which is acceptable for secondary dressings where immediate absorption is less critical. Kingphar Medical adjusts its bleaching and degreasing processes to meet either specification precisely.
A: Yes. Our production lines are fully equipped to meet EN 14079 requirements, which focus on performance metrics like breaking strength and bioburden levels rather than just thread counts. We provide gauze swabs and rolls that carry CE marking compliant with MDR (EU) 2017/745.
A: You can perform a basic check using a 1-inch (2.54cm) pick counter or a magnifying glass with a calibrated scale. Count the threads in a 1-inch square. For example, USP Type VII should have roughly 20 threads in one direction and 12 in the other (totaling ~32 threads per sq. inch, often simplified). For precise verification, Kingphar offers detailed lab reports with every shipment.
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