Expander MTP is a premium bright zinc plated steel expander developed for demanding environments. It is ETA assessed for use in both cracked and non-cracked concrete (sometimes referred to as ETA Option 1) and can also be used in hard natural stone, although this is not covered by the ETA assessment. With verified fire resistance R30-R120 and assessment for seismic loads, EST1 is a safe choice for projects with high safety requirements. The range also includes shorter variants with reduced insertion depth for faster and easier installation. is also available in hot-dip galvanized and A4 acid-proof versions and meets the CE requirement through ETA-17/0566.