Add to Cart GaPS4 Crystal Gallium Phosphorus Sulfide MSRP: Now: $580.00 Was: GaPS4 is a 2D auxetic material with exotic mechanical and optical properties. In 2D form, it exhibits negative Poisson’s ratio both in-plane and out-of-plane directions. Bulk GaPS4 is a... BLK-GaPS4 MSRP: Now: $580.00 Was: Add to Cart Qty in Cart: 0 Quantity: Decrease Quantity: Increase Quantity: Price: MSRP: Now: $580.00 Was: Subtotal: Add to Cart