Medium modulus one part, PU construction sealant
PU25 is a one component, moisture
curing, polyurethane construction sealant. The
product has been formulated to offer a non-slump
elastomeric sealant, which exhibits good skin
formation time and fast cure.
TYPICAL USES
SpECseal PU25 may be used for bonding and
sealing most common building materials including
concrete, wood, lacquered metal, anodised
aluminium and glass. SpECseal PU25 has high
elasticity, excellent recovery and tear resistance
and good weatherability. SpECseal PU25 can also
be used in submerged conditions
ADVANTAGES
· Tough resilient seal
· No primer required
· Non staining
· Good resistance to dilute acids and alkalis
· Available in range of colors
· Non-toxic – safe for potable water application
STANDARD COMPLIANCE
ISO 11600 Class F 25LM
ASTM C 920
TECHNICAL DATA
Colours black, grey, white,
beige and ivory.
Other colours subject
to minimum quantity
Movement
accommodation factor 25%
Consistency thixotropic
Specific gravity @ 20°C 1.18
Tooling time @ 20°C and
50% R.H.) 60 min.
Paint compatibility water-based paints
PACKAGING AND YIELD
SpECseal PU25 is supplied in 600ml sausage
sachets.
One 600 sachet will fill 6 LM of 10mm x 10mm
joint. For larger joints a width-to-depth ratio of 2:1
should be maintained. In open joint use SpECcord
backer rods to keep a uniform joint depth
APPLICATION TEMPERATURE RANGE
Minimum +5°C
Maximum +40°C
CHEMICAL RESISTANCE
SpECseal PU25 is resistant to:
Ultraviolet light good
Dilute acids and bases medium
Salt water excellent
APPLICATION
Preparation
It is essential that the joint arises are clean and free
from any deleterious matter which could prevent
adequate bond to the substrate.
The substrates must be clean, dry, free of dust and
greased other contaminations. Do not apply to
wet, damp or hot surfaces, or during inclement
weather when used in exterior joints.
Application
SpECseal PU25 shall be applied with a manual or
pneumatic caulking gun. After application the
sealant can be smoothed with a finishing tool or
gloved finger dipped in soapy water as lubricant.
EQUIPMENT CLEANING
SpECseal PU25 should be removed immediately
from tools using solvent (white spirit) before curin
STORAGE AND SHELF LIFE
SpECseal PU25 has a shelf life of 12 months
when stored in original packaging at a maximum
temperature of 30°C. If stored at high ambient
temperatures or at high humidity the shelf life will
be reduced by as much as 50 – 60%.
HEALTH AND SAFETY
SpECseal PU25 contains isocyanate and should
not come into contact with skin or eyes. If
swallowed, DO NOT induce vomiting. Seek
medical attention immediately. Wear protective
gloves and goggles
