SPI Supplies offers a wide range of silicon nitride membrane TEM window grids. 

Use this chart to help find the SiN Membrane TEM Window Grid that fits your need.
These grids are all 3mm in diameter, with a low-stress silicon nitride membrane. Available in packs of 10 grids.

For other Silicon Nitride Membrane materials. 
For our complete line of membrane products.

 

Silicon Nitride Membrane Window Selection Chart   All Grids 3mm diameter, Pack of 10           SiN window thickness (nm) Window Size (mm) Frame Thickness (um) SPI Supplies  Part Number 20 0.05 200 4163SN-BA 20 0.1 200 4107SN-BA 20 0.3 200 4105SN-BA 20 0.5 200 4139SN-BA 30 0.05 200 4090SN-BA 30 0.1 200 4097SN-BA 30 0.3 200 4104SN-BA 30 0.5 200 4125SN-BA 30 0.5 100 4192SN-BA 30 1.0 200 4162SN-BA 50 0.1 200 4096SN-BA 50 0.3 200 4103SN-BA 50 0.5 200 4124SN-BA 50 0.5 100 4132SN-BA 50 1.0 200 4135SN-BA 75 0.1 200 4095SN-BA 75 0.3 200 4102SN-BA 75 0.5 200 4123SN-BA 100 0.05 200 4088SN-BA 100 0.1 200 4094SN-BA 100 0.3 200 4101SN-BA 100 0.5 200 4122SN-BA 100 0.5 100 4131SN-BA 100 1.0 200 4112SN-BA 150 0.1 200 4093SN-BA 150 0.3 200 4100SN-BA 150 0.5 200 4121SN-BA 150 1.0 200 4161SN-BA 200 0.1 200 4092SN-BA 200 0.3 200 4099SN-BA 200 0.5 200 4120SN-BA 500 0.1 200 4091SN-BA 500 0.3 200 4098SN-BA 500 0.5 200 4109SN-BA