4in (101.6mm) Neoprene Pads are available in 50, 60, 70, or 90 durometers for compressive strength testing of 4x8in concrete cylinders, and meet requirements of ASTM C1231/1231M and AASHTO T 22. These 0.5in (12.7mm) thick pads flow during compression to fill irregularities in the cylinder ends and assure uniform load distribution. HM-181 4in Steel Retainer Set is sold separately and is required to contain the pads at each end of the concrete cylinder. Two pads are required for testing. Pads are reusable in up to 100 tests and are sold individually, a package of 12, or HM-490 is a set of two.
HM-360 has 4in diameter with a 50 durometer and is suitable for testing concrete strengths from 1,500-6,000psi (10-40mPa).
HM-361 has 4in diameter with a 60 durometer and is suitable for testing concrete strengths from 2,500-7,000psi (17-50mPa).
HM-362 has 4in diameter with a 70 durometer and is suitable for testing concrete strengths from 4,000-7,000psi (28-50mPa). With further qualification testing by a user, 70 durometer pads can be used to test concrete with strengths from 7,000-12,000psi (50-80mPa).
HM-490 is typically used when testing cylinders with compressive strengths greater than 12,000 psi (80mPa). These high-strength neoprene pads are only available in 4in diameter and are supplied in sets of 2. They have been used successfully to determine concrete strengths above 15,000psi (103mPa) when the owner or testing facility has developed comparative qualifying data for review and approval by the project engineer.
- Available in three different durometer ratings
- Can be used up to 100 times before replacing
- Meets ASTM and AASHTO standards (except HM-490)
- 4in Neoprene Pad in 50, 60, 70, or 90 Durometer (single unit, pack of 12 or HM-490 is set of 2)