Loctite 438 Prism Instant Adhesive 20g
Loctite 438 Prism Instant Adhesive 20g
- Shear Strength, Grit Blasted Steel : 2800 psi
- Full Cure Temperature : 77 °F
- Viscosity : 200 mPa.s (cP) Brookfield
- Key Substrates : Metals , Plastics and Rubbers
- Color : Black
- Curing Type : Humidity
- Application : Bonding
LOCTITE® 438 is a black, toughened ethyl-based instant adhesive. It has a fixture time of 10 - 20 secs., high impact resistance and is flexible. It is suitable for bonding plastics, rubber, metals, porous and absorbent substrates and acidic surfaces. Good resistance in humid environments.
- Cures very quickly when confined between two surfaces
- Ideal for bonding small to medium-size parts
- Excellent adhesion to most substrates
- Suitable for rubbers and plastics
- Well suited to metals, porous and/or acidic surfaces
- Fixture time of 10 - 20 secs.
- Toughened, black
438™ is a rubber toughened adhesive with
increased flexibility and peel strength along with enhanced
resistance to shock. The product provides rapid bonding on a
wide range of materials, including metals, plastics and
elastomers, as well as porous and absorbent materials like
wood, paper, leather and fabric.
TYPICAL CURING PERFORMANCE
Under normal conditions, the atmospheric moisture initiates the
curing process. Although full functional strength is developed
in a relatively short time, curing continues for at least 24 hours
before full chemical/solvent resistance is developed.
Cure Speed vs. Substrate
The rate of cure will depend on the substrate used. The table
below shows the fixture time achieved on different materials
at 22 °C / 50 % relative humidity. This is defined as the time to
develop a shear strength of 0.1 N/mm².
Cure Speed vs. Bond Gap
The rate of cure will depend on the bondline gap. Thin bond
lines result in high cure speeds, increasing the bond gap will
decrease the rate of cure.
Cure Speed vs. Activator
Where cure speed is unacceptably long due to large gaps,
applying activator to the surface will improve cure speed.
However, this can reduce ultimate strength of the bond and
therefore testing is recommended to confirm effect.
Cure Speed vs. Time
The graph below shows the shear strength developed over
time at 22 °C / 50 % RH on various substrates and tested
according to ISO 4587.
This product is not recommended for use in pure oxygen
and/or oxygen rich systems and should not be selected as
a sealant for chlorine or other strong oxidizing materials.
For safe handling information on this product, consult the
Safety Data Sheet (SDS).
Directions for use:
- For best performance bond surfaces should be clean and free
- This product performs best in thin bond gaps (0.05 mm).
- Excess adhesive can be dissolved with Loctite cleanup solvents,
nitromethane or acetone.
Loctite Material Specification
LMS dated November-01, 2005. Test reports for each batch are
available for the indicated properties. LMS test reports include
selected QC test parameters considered appropriate to specifications
for customer use. Additionally, comprehensive controls are in place to
assure product quality and consistency. Special customer
specification requirements may be coordinated through Henkel Quality
Store product in the unopened container in a dry location.
Storage information may be indicated on the product container
Optimal Storage: 8 °C to 21 °C. Storage below 8 °C or
greater than 28 °C can adversely affect product properties.
Material removed from containers may be contaminated during
use. Do not return product to the original container. Henkel
Corporation cannot assume responsibility for product which
has been contaminated or stored under conditions other than
those previously indicated. If additional information is required,
please contact your local Technical Service Center or
Customer Service Representative.
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