• Papel japonés Bib Tengujo 12 g/m² ART. 240 — textura de la fibra de abacá
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Japanese Paper Bib Tengujo · 48×75 cm · pack of 65 sheets

Japanese Paper Bib Tengujo · 48×75 cm · pack of 65 sheets

84,50 €
84,50 €
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Japanese Paper Bib Tengujo, reference ART. 240 — 100% abaca conservation tissue paper, pH 7.1

Conservation tissue paper made by machine (M/M, machine made) from 100% abaca —Manila hemp, Musa textilis—, a leaf fiber imported from the Philippines that has been used in Japanese papermaking since the late Taishō period (1912-26). It is none of the three classic Japanese fibers, but with an average length of 6.0 mm it is the non-Japanese fiber that comes closest to kozo (10.0 mm), and twice as long as gampi, mitsumata or softwood pulp (3.0 mm). It has a declared pH of 7.1, the highest value in our Tengujo range. It is an unbuffered paper: it carries no alkaline reserve to release into the assembly.

What is it used for?

  • Strip reinforcements. Format and basis weight intended for strip reinforcements: the 750 mm long side of the sheet yields the full strip in one piece, with no splice on the working axis.
  • Interventions whose criterion is not to add alkali to the assembly. Declared pH 7.1, no added carbonate. Which support it is applied to is decided by the criterion of the intervention.
  • Teaching in Conservation-Restoration (C&R) and Fine Arts degrees: a manageable basis weight for practice in cutting, wet tearing and applying strip reinforcements.

Why choose Bib Tengujo?

  • pH 7.1 — the highest declared value in our Tengujo range. The other Tengujo papers in our catalog are declared between 6.5 and 6.7; this is the only one above 7.0.
  • No alkaline reserve. It has no added carbonate: it is an unbuffered paper that adds no alkali to the assembly.
  • Average fiber length of 6.0 mm. Figure from the table of papermaking raw materials by Mizumura and Moriki, published by the International Council of Museums Committee for Conservation (ICOM-CC) at its 18th Triennial Conference, Copenhagen 2017: abaca 6.0 mm · kozo 10.0 mm · gampi, mitsumata and softwood pulp 3.0 mm.

What to know before using it

  • Facing over relief. In the reference study of seven papers for facing oil paintings on canvas (Varela, Rossi Doria and Bailão, Ge-conservación 20, 2021), a Bib Tengujo of 100% manila at 12 g/m², from another European supplier, achieved the best adhesion of the seven over high impasto (≥ 3 mm).
  • Check the grain direction before cutting the strips. Below you will find how to do it in the studio.
  • The reversibility of the treatment is set by the adhesive, not the paper.

Packaging and storage

  • Format: pack of 65 sheets of 480 × 750 mm (48 × 75 cm), 12 g/m², 0.36 m² per sheet. The item is also cataloged in a ream of 500 sheets; if you need that volume, write to us.
  • Shelf life: it is paper, not a chemical product with an expiry date.

Frequently asked questions

Does it have an alkaline reserve? And how does that relate to pH 7.1?
They are two different things. pH describes the state of the paper; the alkaline reserve is carbonate added to neutralize future acidity. This paper has a declared pH of 7.1 and no added carbonate: it is unbuffered, and that is why it adds no alkali to the assembly.
How do I check the grain direction of the sheet?
On a 48 × 75 cm sheet it is worth checking before cutting strips: moisten an offcut and watch which way it curls, or tear it in both directions —the clean, straight tear marks the grain direction—.
Which adhesive is it applied with? Is the treatment reversible?
The paper is the support of the reinforcement: the reversibility of the treatment is set by the adhesive you choose, not by the paper. The choice depends on the support, on the criterion of the intervention and on how much water you can introduce into the work. The chemical risk of a facing comes from the adhesive and its removal solvent, not from the paper. Tell us about the case and we will tell you what fits.
Is it suitable for facing an oil painting on canvas?
In the published, peer-reviewed study of seven papers for facing oil paintings on canvas (Varela, Rossi Doria and Bailão, Ge-conservación 20, 2021), a Bib Tengujo of 100% manila at 12 g/m², from another European supplier, was the best of the seven over high impasto for adhesion and absence of bubbles. If your case is a facing, write to us and we'll advise you.
I'm torn between Bib Tengujo, the 9 g Kashmir and the 6 g. How do I decide?
By what the paper is going to do, not by thickness. Bib Tengujo (ART. 240) has the highest declared pH in our Tengujo range (7.1): it is the one chosen when the criterion of the intervention is not to add alkali to the assembly. The Tengujo Kashmir 9 g (ART. 502), pH 6.7, is the basis weight used for fine tears and small losses. The Tengujo 6 g (ART. 561), pH 6.7, when the aim is the least possible presence on the work. For these last two, the criterion is a studio one: the basis weight.
Is it Japanese paper if the fiber is abaca?
It is cataloged as Japanese paper, and the fiber is not Japanese: abaca (Manila hemp, Musa textilis) is imported from the Philippines and has been used in Japanese papermaking since the late Taishō period (1912-26). It is none of the three classic Japanese fibers —kozo, gampi and mitsumata—, but with an average fiber length of 6.0 mm, against 10.0 mm for kozo and 3.0 mm for gampi and mitsumata, it is the non-Japanese fiber that comes closest to kozo (Mizumura and Moriki, ICOM-CC 2017).
Does it have a safety data sheet (SDS)?
No, and it is not 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 covers hazardous substances and mixtures, not articles. No hazard classification is declared for this paper. The chemical risk, when there is one, comes from the adhesive or solvent applied with it.

Have questions? Message us on WhatsApp, visit innovart.art or email info@innovart.art and we'll advise you.

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