is this compatible with HP 1820 J9981A?

HP 1820 J9981A has 10/100/1000 ports plus 4 SFP ports. Our 10GBase-SR normally only supports 10G rate. We recommend you to try our 1.25G SFP 1000Base-SX for HP https://store.10gtek.com/1-25g-sfp-1000base-sx-850nm-550-meter-sfp-sfp-ge-s-hp/p-8813