Patent ID: 8642184
Filing Date: 2014-02-04
Classification: B27N,C09K,Y10T

Abstract:
1. A fire-resistant oriented strand board material comprising: a middle layer and two outer layers, said outer layers comprising bonded wood flakes that are substantially oriented in a first direction and said middle layer comprising bonded wood flakes that are substantially oriented in a second direction; at least one first fire-retardant agent provided in the middle layer; the at least one first fire-retardant agent and at least one second fire-retardant agent provided in one or both outer layers; said at least one first and second fire-retardant agents in one or both outer layers having a stronger fire-retardant effect than all fire-retardant agents in the middle layer; and wherein the concentration of the first fire-retardant agent in the outer layer or outer layers in which the first fire-retardant agent is present is lower than the concentration of the first fire-retardant agent in the middle layer.