ALC-H Series · ALC-H1000
ALC-H1000
9004-65-3
3912.39
Technical specification
Every value is shown with its test condition. Parameters that are set per batch are confirmed on the batch COA.
| Parameter | Value | Test condition / method |
|---|---|---|
| Chemical name | Hydroxypropyl methyl cellulose | — |
| CAS number | 9004-65-3 | — |
| HS code | 3912.39 | — Final classification per destination customs. |
| Appearance | White to off-white powder | — |
| Ionicity | Non-ionic | — |
| Substitution degree (DS / MS) | Methoxyl 19.0–24.0% / Hydroxypropyl 4.0–12.0% | Determined per production batch, USP/GB method |
| Moisture content | Max 5.0% % | Halogen moisture analyser, 105 °C |
| pH | 5.0–8.0 (1% solution, 25 °C) | 1% aqueous solution, 25 °C |
| Particle size | Min 98% through 80 mesh (180 µm) | Dry sieving, 80 mesh |
| Bulk density | 300–500 g/L g/L | Untapped, as packed |
| Gel temperature | 55–70 °C (2% solution) °C | 2% aqueous solution, heating rate 1 °C/min |
| Ash content | Max 5.0% (as sulphate) % | Muffle furnace, 800 °C |
Typical values for this grade, not a specification guarantee — the contractual figure is the one stated in the COA issued for your batch. Viscosity is measured on a 2% aqueous solution at 20 °C, Brookfield LV, 20 rpm.
How HPMC works in a mortar is the same across grades — see the HPMC category page for the water-retention, anti-sag, open-time and film-forming mechanisms behind every grade. What changes with viscosity is the number and the application band, and those are on this page.
Applications
ALC-H1000 is used in the following systems — Wall putty, Gypsum plaster, High-build putty. Which viscosity band suits which system is set out in the application-and-viscosity table on the HPMC category page .
A grade that is wrong for the system costs more than the price difference between two grades. Tell us the system and we will tell you if this one is a poor fit.
Batch consistency, export documents and response time do not change with viscosity grade — they are set out under six things procurement can verify on the home page.
Sample, packaging & storage
200 g free of charge, shipped from stock. Dispatch arrangements are set out in the sample confirmation.
Store sealed and dry, below 35 °C, away from direct sunlight. Shelf life: 24 months from production date in the unopened original packaging. MOQ 1 metric ton per grade.
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FAQ
Batches typically measure between 90,000 and 120,000 mPa·s against a nominal 100,000 — that is −10% to +20% of nominal. The spread comes from the test method, the test conditions and the instrument, not from a drifting process. The contractual figure is the one stated on the batch COA, measured at 2% aqueous solution and 20 °C.
No — viscosity is a design parameter, not a quality ranking. The 100,000 mPa·s band buys water retention and sag resistance at low dosage, and it costs flow and workability while raising water demand. A putty that has to be sanded in two coats is a better product on the right band for it, whichever number that is.
It retains the water the substrate would otherwise pull out of the plaster, and keeps the paste lubricated so it spreads without lumping. Setting time is not its job: retard the gypsum with a dedicated retarder, dose the ether from the table above, and confirm both on a laboratory trial — over-dosing the ether to slow the set is a common and expensive mistake.
Dispersion and water demand. Add the powder to the water under shear and let it hydrate before adding binder, otherwise high-viscosity grades lump; the delayed-solubility behaviour helps here. Expect to re-tune the water addition too — the same dosage of a higher band thickens more, and a straight swap usually over-stiffens the mix.
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ALC-H1000