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Certification
 PP Primer / Adhesion Promoter

 Testified By
Sirim QAS International
 (Malaysia)
 Report No. 2006KL0590

Reference Standard:

           1)       JIS 5400: General Testing Method for Coating

Method Test            

          2)       ES-X 71226: Painting – Flexible Plastics
            3)       MS 82-3101: Testing Method for Coating and Coating Film
   
            Test Result
          Product : Eptex Formula PP Primer
          Model / Code : R 100-G
 
No Type of Test Requirement
ES-X 71226		 Result
1
 		 Viscosity (Flow Cup),
sec ISO Cup No. 4, ISO
243		 - 19.5
2
 		 Density & Specific
Gravity by S.G.Cup @
25ºC ASTM D1475		 - Density = 0.8761 g/ml
Specific Gravity = 0.8789
 
3
 		 Nonvolatile Content of
Coating, % ASTM
D2369		 - 4.55
4

 		 Dilution Stability
JIS K 5400 Clouse 6.5
 		 -

The wet primer was free
from rivaling, unevenness,
graining, pinholes and
whitening.
5

 		 Drying Time
JIS K 5400 Clouse 6.5
 		 -

Set to touch dry : 20
minutes
Tack free : 35 minutes
Dry hard : 18 hours
6
 		 Contrast Ratio, %
JIS K 5400 Clouse 7.2		 - 43.6
7






 

Appearance
ES-X71226 Clouse 4.3




 

No easily identifiable defects such
as blister, peeling off, crack, pinhole,
bubble, foreign material flaw,
spreading mottle and orange peel
etc. However quality shall be equal
or superior to standard sample if given.
 

There was no identifiable defects such as blister
peeling off, crack, pinhole,
bubble, foreign material
flaw, spreading mottle and
orange peel etc.

 
8
 		 Cross-cut Adhesion Test
ES-X 71226 Clause 4.7.1
 

Grade M2.5 or better(MS 82-3101-Spacing -1mm cut)
 

Grade M1
(MS 82-3101- Spacing -1mm cut)
9


 		 Impact Resistance
ES-X 71226 Clause 4.9

 

No peeling off when a weight is drop
from a height of 50cm.  No
deterioration in adhesion under tape
test.  Crack in film is pass.
 

No peeling off when a weight is drop from a height of 50cm. No deterioration in adhesion under tape test. No crack in film.
10

 

Bending Resistance
 ES-X 71226 Clause 4.10
MS 82-3101 Clause 6.9

No crack of material and no peeling off.
Crack in film is pass

No crack of material and no peeling off but there was crack in film.
11 Pencil Hardness
MS 82-3101 Clause 6.6		 - 28
12


 		 Gloss(Specular Reflectance 60
Degrees)
ES-X 71226 Clause 4.4
JIS K 5400

Metallic Color:
Horizontal: 90 minimum
Vertical: 88 minimum
 

Horizontal: 92
Vertical: 90

 
13

 		 Thermal/Heat Resistance
ES-X 71226 Clause
4.19

The paint shall be no excessive discoloring, fading, swelling,
cracking and also no deteriorating in adhesion.

The paint showed no discoloration, fading, swelling and cracking. The adhesion was M-2
14


 

Gasoline Resistance
 ES-X 71226 Clause
4.18

 

The paint shall be no excessive discoloring, fading, swelling, peeling off, cracking and exposing bare material.
 

The paint showed no discoloring, fading, swelling, peeling off, cracking and exposing bare material.
15



 		 Acid Resistance
Spot Test-0.5% H2SO4
& 0.1N HCI
ES-X 71226 Clause
4.16

The paint shall be no excessive discoloring, fading, swelling, peeling off, cracking and exposing bare material.
 

The paint showed no discoloring, fading, swelling, peeling off, cracking and exposing bare material.
16



 		 Alkali Resistance
Spot Test -0.1N NaOH
ES-X 71226 Clause
4.17
 

The paint shall be no excessive discoloring, fading, swelling, peeling off, cracking and exposing bare material.
 

The paint showed no discoloring, fading, swelling, peeling off, cracking and exposing bare material.
17

 		 Abrasion Resistance by Sand Falling method
 

Record the volume of used sand
until the coating peels off and the base metal or the lower layer is exposed.

 405 litres
18






 		 Heat Cycle Resistance
ES- X 71226 Clause 4.12





 

After heat cycles (5 cycles) no gloss change, discoloring, wrinkle, blister, crack, deterioration in adhesion, impact resistance change, bending resistance change as compared to sample panel

 

There was no gloss change, discoloration, wrinkle, blister and crack. The paint also showed no deterioration in adhesion (Grade M-1), no change in impact resistance and no bending resistance
change.

PP Primer / Adhesion Promoter
Evaluation of Suitable Polymeric Primers for Moulded Polypropylene Specimen
By
UNIVERSITY SCIENCE OF MALAYSIA
(School of Industrial Technology)

AIM:
The main task of this study was to search and evaluate several probable polymers as primers to improve paintability
of adhesion of paint coating on polypropylene moulded pieces. The polypropylene pieces were to simulate those of
polypropylene homopolymer used car bumpers.
 
PROCEDURE:
Several polymers viz Natural Rubber compound, Chlorosulphonated Polyethylene (CSPE) and Chlorinated Polyethylene
(CPE) were selected for this purpose. A 2% solution was prepared and then thin layer was applied to the various specimen.
When dried, they were then painted with a thin coat of paint. A control which was that without the primer was similar
painted for comparison. Several standard tests to assess the paint adhesion properties were subsequently performed. They were as follows:-
 
(A) Peeling Test
Square pattern was cut on the paint, then taped which was subsequently peeled.

(B) Resistance Against 2H Pencil
Straight line was engraved on the surface. The resistance of the paint surface were then noted.
 
(C) Bending for Flexing Resistance
Here the specimen s were flexed several times, the peeling resistance were noted.
 
(D) Peeling Resistance after Soaking in water and UV exposure for 48 hrs

(E) Falling weight Impact Resistance
 

RESULTS
Test Performed Without Primer Natural Rubber CPE CSPE
  Peeling Test

 		   All removed, adjacent
  column or squares
  affected		   All retained or
  unaffected
 		   All retained but some
  traces of peeling off
 		   About half affected

 
  Resistance against
  2H Pencil
 		   Cut, with peeling off
  along cut direction
 		   No affect

 		   Slight cut, but no
  peeling off
 		   Cut with peeling off
  however better than
  with primer
  Bending of flexing
  resistance
 		   Poor, or obvious
  peeling off
 		   No evidences of
  peeling off specimen
  still ductile		   Slight peeling, but
  specimen becomes
  brittle		   No effect, sample still
  ductile similar to
  rubber primer
  Peeling resistance
  after soaking @water
  48 hrs. in water (tap)
 		   Poor bonding all
  peeled off, plus
  adjacent squares or
  areas.		   Good bonding with
  minimum areas
  affect.
 		   Reasonable
  bonding, about ¾
  areas coming off.
 		   Poor, lost of bonding
  all areas affected

 
  Falling weight impact
  resistance

 		   Poor, large area of
  peeling

 		   No peeling observe,
  sample still ductile.

 		   Slight peeling similar
  to CSPE, however
  CPE seems to be
  brittle		   Slight peeling around
  the impact region.

 
   UV resistance @ 48
   hours		   Poor bonding
 		   Good bonding
 		   Reasonable bonding
 		   Poor, loss of bonding
 

CONCLUSION
From the various tests, it is apparent that the Natural Rubber Based primer were the best with no obvious indications
of peeling off under the numerous conditions viz. soaking, UV exposure, against 2H pencil scratch and flexing.



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