Page 1
Board performance, backed by
product-specific testing.
A clear guide to the tested 12 mm board,
applications and specification checks.
PRODUCT OVERVIEW / SEPTEMBER 2026
Page 2
THE PRODUCT
01 / THE BOARD
A practical building board
Magnesium sulphate board with a reinforced multilayer construction.
SulfRock Ltd supplies magnesium sulphate board
for building applications. The available test
reports concern a 12 mm sample. Confirm that the
board supplied today has the same composition
and specification as the tested sample.
12 mm TESTED BOARD
Other thicknesses and finishes require their own
applicable evidence.
Page 3
FIRE EVIDENCE
02 / REACTION TO FIRE
A1 classification
The classification applies to the sample and construction described in the report.
EN 13501-1:2018
A1
The 12 mm magnesium sulphate board sample was
classified A1 for reaction to fire. Testing used EN ISO
1182:2020 and EN ISO 1716:2010.
Test report 241217005SHF-001; issued 6 January 2025. The
applicant named on the original report predates current
SulfRock branding; confirm product traceability.
This is a board reaction-to-fire result. It does not give a fire-resistance period for a wall, floor or IPS
insulated panel.
Page 4
PERFORMANCE EVIDENCE
03 / TESTED VALUES
Measured, not assumed
Results below are for the tested 12 mm sample; performance in a finished assembly depends on design and
installation.
DENSITY
919 kg/m³
ASTM C1185-23, section 6
FLEXURAL / DRY
20.5 MPa
Mean, equilibrium
conditioned
FLEXURAL / WET
18.1 MPa
Mean, wet conditioned
WATER ABSORPTION
18.4%
Mean by mass, 48 h
immersion
THERMAL CONDUCTIVITY
0.180 W/mK
Mean at approx. 25°C
LEACHABLE CHLORIDE
0.0098%
ASTM C871-18(2023)
Source: Intertek report 241203010SHF-001, issued 20 January 2025. Methods and conditioning are given in the full
report.
Page 5
FURTHER TEST RESULTS
04 / PERFORMANCE IN CONTEXT
Check the test conditions
The following figures describe the tested board under laboratory conditions.
WATER TIGHTNESS No drops formed on underside after the specified 24 h test.
FREEZE / THAW 25 cycles: no visible defects; retained flexural-strength ratio 0.96.
HEAT / RAIN 25 cycles: no visible change reported.
FACE SCREW WITHDRAWAL 1,456 N with the laboratory-specified No. 10 Type AB screw.
NAIL-HEAD PULL-THROUGH Mean maximum load 1,636 N with the specified nail geometry.
Source: Intertek report 241203010SHF-001. These tests do not replace project-specific fixing, weatherproofing or
structural design.
Page 6
USES AND SELECTION
05 / BOARD SELECTION
Specify the right build-up
Board choice should follow the complete application and the relevant supporting evidence.
BACKER BOARD FLOOR SUBSTRATE INTERIOR FINISH
Confirm board type, finish, thickness, exposure, framing, fixing pattern, joints and compatibility before ordering.
Page 7
PROJECT CHECKLIST
06 / INSTALLATION
Plan the details
Obtain a project-specific installation method and current safety information before work starts.
01 BOARD Confirm identity, thickness, dimensions and edge profile.
02 SUPPORT Set out framing, spans, joints and movement requirements.
03 FIXINGS Choose the fastener and pattern for the actual substrate and loads.
04 EXPOSURE Detail moisture protection, interfaces and finish compatibility.
05 SITE SAFETY Assess cutting dust, manual handling and suitable controls.
Page 8
REPORTS AND CONTACT
07 / DOCUMENTATION
Request the full evidence
Report numbers allow project teams to check the complete test methods, sample identity and limits.
REACTION TO FIRE
241217005SHF-001 / EN 13501-1:2018 / A1 classification for tested 12 mm board.
BOARD PERFORMANCE
241203010SHF-001 / physical, moisture, thermal and fixing tests of the 12 mm sample.
ADDITIONAL ASTM TESTS
241111004SHF-001 / ASTM E84 surface burning. 241127003SHF-001 / ASTM E136 combustibility.
The original reports name the manufacturer under its earlier branding. Request the complete reports and confirm
product traceability; board tests do not establish IPS panel fire resistance. Panel fire testing is due soon. Watch
this space.
Request the complete reports through the protected technical portal:
sulfrock-boards.white-dill-3480.chatgpt.site/technical
07786 388201 / re@intelligentpanelsystems.com