Bonding / Gluing

Panguaneta technology at the service of environmental-friendly applications

Types of bonding

The quality of Panguaneta glues comply with the provisions of UNI EN 314 Standard, after suitable treatment in view of resistance to humidity (gluing class):

Class 1: urea bonding that meets the Class 1 requirements for the use of plywood in dry environments (UNI EN 636-1);
Class 2: melamine bonding that meets the Class 2 requirements for the use of plywood in humid environments (UNI EN 636-2);
Class 3 melamine bonding that meets the Class 3 requirements for the use in full exterior environments (UNI EN 636-3).

Formaldehyde and the environment

The plywood is classified according to its formaldehyde emissions according to precise technical criteria summarised in appendix B of UNI EN 13986. Formaldehyde (formic aldehyde, Volatile Organic Compounds) is widely used in the production of construction materials and furniture manufacturing, and is also a secondary product of combustion and some natural phenomena, that are present both indoors and outdoors.

Italian laws

In Italy it is forbidden to allow the use of panels, half-finished or finished products with formaldehyde emissions higher than those established for Class E1. The products have to be accompanied by a conformity declaration by the producer. A circular letter from the Ministry (2009) gives further explanations with regard to:

  • identification of materials/processes considered as possible causes of added formaldehyde;
  • execution of the annual test provided by Art. 4, paragraph 3 of Decree dated 10 Oct. 2008;
  • frequency of internal controls;
  • conformity declaration presentation modes;
  • responsibility of the production and marketing chain.

Annexed document: Italian Law Decree

Limits and measures

Since 1 January 2009, new limits to the emission of formaldehyde have come into force in California with regard to the entrance of wood-based panels and related products (including furniture). With phase 2, implemented between 2010 and 2012, today’s values (comparable with European class E1) have been reduced to 0.05 ppm for plywood, 0.09 ppm for hardboards and 0.11 ppm for MDFs. The reference measuring method in the US market (ASTM E 1333-96 – (large chamber method) does not correlate directly with the European system (EN 717-1); the products involved will thus have to possess also third-party certifications issued by organisations authorized by the California Air Resource Board. Formaldehyde emissions are subject to obligatory evaluations also in other countries in the world. The criteria followed differ, however, and are not always easily comparable.

Annexed document: Description of the classification systems in force in various geographical areas

Class E1 – the standard

The emission class is assigned in conformity with the UNI EN 636 standard.
The low emission class E1 panels do not cause a concentration of equilibrium in the air of the test chamber (defined in the UNI EN 717-1 standard) greater than 0.1 ppm, the limit established by the World Health Organisation for living and residential environments.

Carb Phase 2 – the evolution

For many years Panguaneta has been a leader in the study of panels that can satisfy an extremely demanding market like that of the United States, directing its production toward bonding methods and types with the minimum or no formaldehyde emissions, such as the NAF (No Added Formaldehyde) that qualifies the “Eco” range. Panguaneta moreover performs special “custom” bonding systems, such as:

  • CARB Phase 2 (certificate no. 001-TPC 016): All-Poplar, Ilomba-Twin, Ceiba-Twin, Okoumé-Twin, Birch-Twin, Maple-Twin plywoods
  • TSCA Title VI (certificate no. 001-TPC 016): All-Poplar, Ilomba-Twin, Ceiba-Twin, Okoumé-Twin, Birch-Twin, Maple-Twin plywoods

Pureglue plywood - 100% green

Panguaneta is the first company in Europe to have obtained the certification of products without added formaldehyde. With the NAF (No Added Formaldehyde) Certificates, the Panguaneta panels respond by far to the strictest world regulations (CARB Phase 2, Japanese F****, AS/NZS) and can keep abreast with the future, both in the ecological and technical sense. Though competing in resistance with traditional glues, the NAF do not emit formaldehyde, and thus improve the quality of air. The products of the PUREGLUE range are developed by Solenis LLC, global leader in the development of biomaterials for the industry, using the Soyad™ technology, a soy flour–based resin.

NAF – No Added Formaldehyde (certificate no. N-18-191 issued by ARB Institute – Air Resource Board): plywood of the Eco range.