OPA2990: OPA2990IDSGR weight and Contains a silicon-based transducer

See the materical content declaration on ti.com/quality-reliability-packaging-download/report?opn=OPA2990IDSGR; it's linked to from the product page:

Hello, 

Thanks for posting on e2e! 

The material content on ti.com will show the mass (mg) within approximately +/- 10% of the detailed mass value.
Here is the link for the OPA2990: Material content search | Texas Instruments (ti.com)

I am not sure what the following is: 

dana tu1 said:

 silicon-based transducer 

There is a detailed chemical test report that may contain your answer: 

All the best,
Carolina