The particle board on the Sawdust Visa Gift Card is a solid form of sawdust, mixed with wood chips, shavings and resin, and then compressed, cured and cut to standard building sizes. Particle board is less expensive than conventional plywood, and somewhat easier to work with, which make it a good choice when strength and appearance are not major considerations. Builders use it extensively under brick and wooden siding, as well as for subflooring. Particle board was developed in Germany in the 1940s when a lumber shortage made traditional plywood manufacture too expensive. Celebrate builders and carpenters with Sawdust Visa Gift Cards.