Technical · PVA 0499
Published 2026 · Ningxia Dadi PVA technical desk
If you run Dadi PVA 0499 vinylon fiber on a production line, the grade you pick decides whether the shift runs clean or fights the recipe all day. Here is the spec we actually hold and why it works.
Dadi PVA 0499 is a 99 mol% hydrolysis grade used for vinylon fiber . Below we cover the real spec we hold, how customers run it, and what to watch on the line.
| Brand | Dadi (export brand: Ningxia Dadi) |
|---|---|
| Grade / Model | 0499 |
| Product | Polyvinyl Alcohol (PVA) |
| Degree of hydrolysis | 99 mol% |
| Avg. polymerization (DP) | 400 |
| Viscosity (4% aq., 20C) | grade-specific (see TDS) mPa.s |
| Solubility | fully hydrolyzed |
| China-market code | - |
| CAS / HS code | 9002-89-5 / 39053000 |
| Appearance | white flake, granule or powder |
| Purity | ≥93.0% (grade dependent) |
| pH (4% sol.) | 5-7 |
How to run it on your line
PVA solution is wet- or dry-spun, drawn, then acetalized into vinylon.
Why 0499 works for vinylon fiber
0499, high polymerization and 99% hydrolysis, is right for spinning; our fibre-grade material is tuned for exactly this step.
From the floor
A vinylon line runs our fibre grade; strength and whiteness meet spec and spin breaks are low. Our Ningxia Dadi QC keeps each lot sampled to expiry, so any issue is traceable.
One tip we always give
The spin dope window is narrow — change process slowly.
How it compares
Against 88-series, the 99% hydrolysis grade resists water better but needs hot water to dissolve; against competitors, our ash and volatiles are held tight so lot-to-lot drift is small — the thing emulsion and PVB customers care about most.
FAQ
Which PVA for vinylon?
High polymerization, high hydrolysis fibre grade — best strength.
Packaging, MOQ & lead time
25 kg PP woven bag (inner PE); jumbo bag on request. MOQ from 1 MT for stock grades, 16 MT for full container; lead time 7-15 days ex-works Ningxia. Incoterms FOB/CFR/CIF; payment T/T or L/C.
Quality & documents (trust signals)
Every lot is tested on Shimadzu GC-2014C / Agilent AOC-20 GC and Brookfield DV2T viscometer; batch sample kept to expiry. EN TDS, MSDS, COA provided. REACH and ISO 9001 status available on request [verify against current certificate].
About the supplier
Ningxia Dadi Circulation Development Co., Ltd. (PVA branch since 2009; Phase I 50,000 t + Phase II 80,000 t; ~585 staff; ABB robotic palletizing; Shimadzu GC-2014C + Agilent AOC-20 gas chromatographs + Brookfield DV2T viscometer for QC; named a national first-batch green manufacturing demonstration enterprise in 2017; calcium-carbide to VAM to PVA circular chain.
Written by Li Wei, Senior Technical Sales Engineer, Polyvinyl Alcohol Division — Ningxia Dadi Circulation Development Co., Ltd. - 9 years placing PVA grades with textile, adhesive and construction compounders across Southeast Asia, the Middle East and South America. Replies to most inquiries within one business day.
Get a quote / sample
VAM drives the price; lock a quarterly framework if your volume is steady. We quote FOB/CFR/CIF, T/T or L/C.
Related product: PVA 0499
Vinylon spinning dope, high-solids binder, fibre finishing
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