Food additive databasegum baseChecked 2026-10-02
Polyisobutylene (Butyl Rubber) ポリイソブチレン（別名ブチルゴム）
Designated additiveNot on the EU additive list
- Purpose
- gum base
- On the label
- “ガムベース” (gum base)
- Name in the List of Designated Additives
- ポリイソブチレン（別名ブチルゴム） (No. 395)
In Japan
- A chewing gum base (also called butyl rubber). Under the standards for use, it can be used only as a base for chewing gum.
- Under the Food Labeling Standards, when used as a gum base it can be labeled under the group name “ガムベース” (gum base).
Japan's standards for use
- Can be used only in chewing gum
- Must not be used for any purpose other than as a chewing gum base
This is a summary of the standards for use. See the source list for the exact conditions.
In the EU
- It is not on the EU list of food additives (Regulation (EC) No 1333/2008, Annex II), so it cannot be used as a food additive in the EU.
Sources
- List of Designated Additives — Japan Food Chemical Research Foundation (Japanese)
- Standards for use and storage of each additive — Japan Food Chemical Research Foundation (Japanese)
- EU food additive database (Japanese translation) — MAFF (Japanese)
- Regulation (EC) No 1333/2008 on food additives — EUR-Lex
- 消費者庁「食品表示基準について」別添 添加物関係（簡略名・類別名一覧、用途名併記の例示、一括名の範囲、栄養強化の範囲ほか） (Japanese)
Checked 2026-10-02. Rules and evaluations change over time. This page is a translation of our Japanese page; if they differ, the Japanese page is the reference.
This page lists facts stated in laws and in evaluations by public bodies; it is not a safety verdict. Additives used in Japan are approved by the government, which sets the foods and amounts they can be used in. The ADI is a guide to the amount that is considered safe to take every day over a lifetime.