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Klucel™ G — Hydroxypropylcellulose for Conservation (Kremer)
Klucel™ G — Hydroxypropylcellulose for Conservation (Kremer)
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Klucel™ G is a hydroxypropyl cellulose (non-ionic cellulose ether) soluble in cold water and in most polar organic solvents. It is manufactured by Ashland (formerly Hercules) and distributed by Kremer Pigmente under reference 63706.
Why choose Klucel G?
- Soluble in water and in alcohol: it allows sizing and consolidation where introducing water is not an option. Kremer puts it concretely — in ethyl alcohol it glues without leaving water tidelines.
- It is the grade the field uses: in the Getty Conservation Institute survey of 155 conservators from the Book and Paper Group of the American Institute for Conservation, grade G was almost the only hydroxypropyl cellulose in use.
- It dries matte and saturates colour very little, which is why it is used on dark, underbound colours.
- Flexible film without plasticizers, and it redissolves in its own solvent.
Uses and applications
- Sizing and repair of works on paper without introducing water, in alcoholic solution.
- Consolidation of leather degraded by red rot — the decay of vegetable-tanned leather that turns it into a reddish powder — in alcoholic solution.
- Consolidation of paint and pastel, in a thin layer and at low concentration.
- Thickening polar solvents (alcohols, amines, dimethyl sulfoxide), acids and bases to prepare cleaning gels. After cleaning, the gel residue must be removed.
What you should know before using it
- Low glass transition temperature, between −4.5 and 15 °C: above that temperature the film is in flow.
- Insoluble in water above 45 °C. Between 40 and 45 °C it precipitates rather than gelling, so heating the water to speed up dissolution achieves the opposite. The precipitation is completely reversible: cooling below 40 °C with stirring redissolves it and restores the original viscosity.
- Medium adhesive strength. Its place is sizing paper and board and consolidating powdering layers. If what you have in hand is a joint that has to bear a mechanical load, good practice calls for another type of adhesive: write to us and we will look at it.
Data declared by the manufacturer
- Off-white, odourless and tasteless powder. CAS No. 9004-64-2 — the international registry number that identifies each chemical substance.
- Molecular weight 370,000 · viscosity 150-400 mPa·s (2 % in water, Brookfield LVF at 25 °C) and 75-400 mPa·s (2 % in anhydrous alcohol).
- Softening temperature 100-150 °C · bulk density 0.5 g/ml · refractive index 1.337 in 2 % solution.
- Hygroscopic: keep the container tightly closed.
Klucel™ is a trademark of Ashland (formerly Hercules). Kremer Pigmente distributes it under reference 63706. If you are looking for the 500 g size in stock with immediate delivery, it has its own page: Klucel® G (500 g).
Frequently asked questions
What viscosity does Klucel G give?
It is a medium-viscosity grade: measured at 2 % in water at 25 °C, it gives around 150-400 mPa·s (millipascal-seconds, the unit of viscosity), and somewhat less in ethanol at the same concentration. That 2 % is the concentration at which the specification is measured; viscosity rises very quickly as it is increased.
Which solvents does it dissolve in?
In cold water and in polar solvents: ethyl alcohol, methanol, 95 % isopropanol and propylene glycol give clear solutions. In acetone or pure isopropanol it stays hazy. It does not dissolve in white spirit or other aliphatic hydrocarbons, nor in toluene or xylene.
What happens if an aqueous solution is heated?
Between 40 and 45 °C it precipitates and turns cloudy. This is reversible: on cooling below 40 °C with stirring, it redissolves and recovers its viscosity. It does not happen in organic solvents, and if the mixture contains alcohol, the precipitation temperature rises.
How is it dissolved without forming lumps?
First disperse the powder in about six times its weight of hot water at 50-60 °C (no hotter than 60 °C), then dilute with cold water, stirring until no gels remain.
What is the dry film like?
Flexible without any plasticiser and not tacky at high humidity. It remains soluble in cold water and polar solvents: the manufacturer only regards it as insoluble if it is crosslinked with another resin.
How should the prepared solution be stored?
Best at pH 6 to 8, in a closed container, away from light and in a cool place. For long storage, with a preservative.
Product on request — estimated delivery 1-2 weeks. Questions about the solvent or the concentration? Write to us: WhatsApp · innovart.art · info@innovart.art
