Our company's new product, the F959 pressure washer, has been started production.The grooves are filled with rubber,
and the new process prevents sagging after dry.

ASTM F 959-2017 (A) Compression gasket type Pressure Indicator [DTI Gasket] 

The grooves can be filled with gelatin.Our filling process is very good and will not sag.

Type 325 -- used for ASTM A325 bolts

Type 490 -- used for ASTM A490 bolts

The material and performance requirements shall comply with the provisions in ASTM F959 standard