Significado e Propósito
3.1 A number of laboratory procedures are used to evaluate the effectiveness of flame retardant and refractory treatments and coatings. Em geral, these methods measure three stages of fire development: (1) ignition; (2) Flame spread (the growth rate of the fire); (3) Fire extent. While all three are extremely important, flame spread has been recognized as a major factor relevant for testing flame retardant coatings.

3.2 Flame spread rating based on test method E84 has gained general acceptance from regulatory authorities, but such large-scale testing is rarely practical during the development or modification of flame retardant-based coatings.

3.3 The test method provides the relative flame spread of the experimental coating using small specimens under conditions established in a 2-foot tunnel. By experimentally calibrating 2-foot tunnels with a similar test method E84 grade flame retardant paint, the results obtained from this test method can be used to screen the suitability of the coating for testing in test method E84 tunnels.

3.3.1 The test method is intended as an experimental tool for evaluating experimental coatings for further development. The results of this test method are not directly related to, or implied by, the results of the test method E84 tunnel.

3.3.2 The results obtained by this test method cannot by itself be used as an accurate predictor of the performance in test method E84 and shall not be used to certify any class of flame spread performance.

ASTM-D 3806-98-2019 “Avaliação em pequena escala de revestimentos retardadores de chama (2-Método de túnel pedonal)”

Escopo de
1.1 This test method determines the protection provided by the coating to its substrate and the comparative combustion characteristics of the coating by assessing the flame spread over the surface during ignition under controlled conditions in a small tunnel. This sets the stage for comparing the surface combustion characteristics of different coatings without specifically considering all end-use parameters that may affect the surface combustion characteristics under real fire conditions.

1.2 In addition to the experimental flame spread rate, panel weight consumed, time of combustion and afterglow, coke size and index, and expansion height can also be measured in this test. No entanto, a relationship between these measures should not be assumed.

1.3 This standard is used to determine certain fire test responses of materials, products or components to heat and flame under controlled conditions by using results obtained from fire test response standards. The results obtained using this standard do not in themselves constitute a measure of fire hazard or fire risk.

1.4 Valores expressos em unidades do SI devem ser considerados padrão. Os valores dados entre parênteses são apenas para referência.

1.5 Esta norma é usada para medir e descrever a reação de materiais, produtos ou componentes ao calor e à chama sob condições controladas, mas não contém por si só todos os fatores necessários para o risco de incêndio ou avaliação de risco de incêndio de materiais, produtos ou componentes sob condições reais de incêndio.

ASTM-D 3806-98-2019 “Avaliação em pequena escala de revestimentos retardadores de chama (2-Método de túnel pedonal)”

1.6 Fire testing is inherently dangerous. Appropriate personnel and property protection measures should be taken when these tests are carried out.

1.7 Esta norma não se destina a abordar todas as questões de segurança, caso existam, associado ao seu uso. É responsabilidade do usuário desta norma estabelecer medidas de segurança apropriadas, práticas de saúde e ambientais e para determinar a aplicabilidade de restrições regulatórias antes do uso.

1.8 Esta Norma internacional foi desenvolvida de acordo com os princípios de padronização internacionalmente reconhecidos estabelecidos na Decisão sobre Princípios para o Desenvolvimento de Normas Internacionais, Diretrizes e recomendações emitidas pelo Comitê sobre Barreiras Técnicas ao Comércio da Organização Mundial do Comércio.