Missing MTC — the fastest way to fail a solar inspection
You did everything right.
• Right bolts.
• Right vendor.
• Right delivery date.
Then comes the one question:
“Can you share the Material Test Certificate?”
• No file.
• No document.
• Only silence.
That’s when panic starts.
Why MTC matters in solar fasteners
In solar EPC projects, HDG 8.8 bolts carry load, vibration, and weather exposure for 25+ years.
MTC isn’t paperwork.
It’s proof.
It confirms:
- • Chemical composition
• Mechanical strength
• Heat number
• Grade authenticity
• Manufacturer information
• Standard compliance
Without it, the bolt might look correct but technically be wrong.
What usually goes wrong
In many supply chains:
- • Bolts from multiple sources get mixed.
• Grade stamps are forged.
• Zinc thickness is never measured.
• Packing loses traceability.
• Documentation is created only when demanded.
And by then, it’s too late.
What EPC clients expect
For HDG 8.8 material, clients demand:
- • MTC linked to the batch
• Zinc coating certificate (80µ, 100µ etc.)
• IS 1367 reference
• Heat number marking
• Packing label with traceability
Deliver without this — and your invoice stays stuck.
How to protect your project
Before dispatch, insist on:
• MTC in PDF format
• Coating test report
• Manufacturer name
• Separate batch packing
• Weight marking
• Grade stamp photo
Don’t accept excuses after delivery.
Certifications come before dispatch.
Final word
Fasteners don’t just hold metal.
They carry:
• Your reputation
• Your payment
• Your future business
Never install anything that cannot be proven.