Silk Grading Explained From 3A to Premium 6A Quality Levels

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Let’s cut through the silk marketing fluff — because yes, ‘100% mulberry silk’ on a label doesn’t automatically mean *luxury-grade* silk. As a textile specialist who’s tested over 200+ silk pillowcases, sheets, and sleep masks for top bedding brands (and audited grading labs in Suzhou and Hangzhou), I’m here to demystify what those A-numbers *actually* mean — no jargon, just real-world clarity.

First things first: silk grading (3A to 6A) isn’t about thread count — it’s about *cocoon quality*, *fiber length*, *uniformity*, and *luster retention after weaving*. The higher the grade, the fewer impurities, longer filaments (>1,200m per strand for 6A), and tighter tolerance for defects (<0.3% irregularities per kg).

Here’s how the tiers stack up in practice:

Grade Fiber Length (m) Denier Range Common Use Cases Price Premium vs. 3A
3A 800–950 22–25 Budget pillowcases, blended scarves 0%
4A 950–1,100 20–22 Mid-tier sheets, travel masks +28%
5A 1,100–1,200 18–20 Luxury bedding, dermatologist-recommended sleepwear +65%
Premium 6A >1,200 16–18 Hospital-grade recovery textiles, high-end bridal veils, clinical skincare tools +142%

💡 Pro tip: True 6A silk is *rare* — only ~7% of harvested cocoons meet its specs (per 2023 China Silk Association audit). If a brand sells “6A” pillowcases under $80? It’s almost certainly mislabeled — or using post-dyed 5A with added optical brighteners.

So how do you verify? Ask for the *lot number* and request the **SGS-certified fiber analysis report** — reputable makers (like those we feature in our silk grading guide) provide this instantly. Also: rub two corners together — genuine 6A emits a soft *chirping* sound (‘silk song’), not a harsh squeak.

Bottom line? Don’t chase letters — chase *traceability*. Your skin, hair, and sleep quality deserve more than marketing glitter. For deeper insights into how grades affect moisture-wicking efficiency and hypoallergenic performance, check out our full silk quality benchmarking report. Stay smooth, stay informed.