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Tengujo Japanese Paper 18 g · 46×69 cm · pack of 25 sheets
Tengujo Japanese Paper 18 g · 46×69 cm · pack of 25 sheets
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Tengujo Japanese Paper 18 g/m², reference ART. 508 — the heaviest weight in our Tengujo range
Japanese paper of 18 g/m², machine-made (M/M, machine made). It is the heaviest weight in our Tengujo range, and the one used in a published case study on grafting large losses.
What is it used for?
- Protective facing: securing loose flakes of oil paint, and backing. These are the uses declared by Japico, the source of this paper.
- Infill grafts on large losses. This is the published use at this weight: the Documentary Heritage Conservation and Restoration Group of the General Archive of the Nation of Colombia used 18 g/m² Tengujo Japanese paper, natural colour, for grafts on the largest losses of the Sinú River map, reserving paper pulp for small losses and tears (Cárdenas González, CR Conservación y Restauración 24, 2021). The publication identifies the paper by type and weight, not by commercial reference.
Why choose Tengujo 18 g?
- Weight with a published intervention. The grafts on the Sinú River map (General Archive of the Nation of Colombia, 2021) were made with 18 g/m² Tengujo, the same weight as this sheet.
- The heaviest weight in our Tengujo range. It completes the range alongside Tengujo 6 g, Kashmir 9 g and Bib Tengujo, for when the piece calls for a heavier paper.
What to know before using it
- The weight is chosen according to the piece. For mounting hinges, the Canadian Conservation Institute (CCI, Institut canadien de conservation) states that a hinge should be neither heavier nor stronger than the piece, while still providing adequate support, and recommends keeping Japanese papers of different weights on hand. This is the heaviest in our Tengujo range; for lighter pieces, you'll find the other three below.
- Feathered edge: trimmed on the piece side. If you tear the hinge rather than cutting it, the CCI recommends trimming that edge on the side facing the piece, so loose fibres don't adhere to it.
- Check the grain direction before cutting strips. Below you'll find how to do this in the studio.
- The reversibility of the treatment is set by the adhesive, not the paper.
Presentation and storage
- Presentation: pack of 25 sheets, 460 × 690 mm (46 × 69 cm), 0.32 m² per sheet.
- Shelf life: it is paper, not a chemical product with an expiry date.
Frequently asked questions
What exactly will I receive?
A pack of 25 sheets of 460 × 690 mm (46 × 69 cm) of Tengujo Japanese paper, 18 g/m², machine-made.
Is it 100% abaca, or does it contain kozo?
It is 100% abacá (Manila hemp), pH 6.7.
What adhesive is it applied with? Is the treatment reversible?
The paper is the support for the graft or hinge: the reversibility of the treatment is set by the adhesive you choose, not the paper, and the choice depends on the support and how much water the piece can tolerate. In the published Sinú River map case, the team used Klucel® G (hydroxypropyl cellulose) at 2.5% in 96% ethanol, and stated the reason: to avoid introducing moisture to the support and to keep the map flat. For mounting hinges, the CCI recommends wheat starch paste. The chemical risk comes from the adhesive and its solvent, not the paper. Tell us about your case and we'll tell you what fits.
How do I make the feathered edge of a hinge?
By tearing the strip rather than cutting it. The CCI describes the technique for Japanese hinging paper: a line is drawn with a fine brush wetted with water, or with a ruling pen loaded with water, and the strip is torn against the edge of a ruler. The feathered edge adheres better and prevents a ridge from forming. The hinge should be no narrower than 1.5 cm, and once in place, the feathered edge is trimmed on the side facing the piece, so loose fibres don't adhere to it.
How do I check the grain direction of the sheet?
On a 46 × 69 cm sheet, it's worth checking before cutting strips: dampen a cutting and see which way it curls, or tear it in both directions — the clean, straight tear marks the grain direction.
I'm torn between the 18 g, the Bib Tengujo, the 9 g Kashmir and the 6 g. How do I decide?
By what the paper will do. Tengujo 18 g (ART. 508) is the heaviest weight in our Tengujo range: it's the weight used in the published case study on grafting large losses. Bib Tengujo (ART. 240) is the highest declared pH in our Tengujo range (7.1): it's chosen when the intervention criterion calls for not introducing alkali to the mount. Tengujo Kashmir 9 g (ART. 502), pH 6.7, is the weight used for fine tears and small losses. Tengujo 6 g (ART. 561), pH 6.7, is for when the aim is the lowest possible presence on the piece. For these last two, the criterion is a studio one: the weight.
Does it have a safety data sheet (SDS)?
No, and it isn't required to. A sheet of paper is an article within the meaning of Article 3(3) of Regulation (EC) No 1907/2006 (REACH); the obligation to provide a safety data sheet (SDS) under Article 31 applies to hazardous substances and mixtures, not to articles. No hazard classification is declared for this paper. Chemical risk, where it exists, comes from the adhesive or solvent applied with it.
Any questions? Message us on WhatsApp, visit innovart.art, or email us at info@innovart.art and we'll advise you.
