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CRYSTIC 2-446 PA

CRYSTIC 2-446PA

Introduction

Crystic 2-446PA is a pre-accelerated, thixotropic, spray viscosity polyester resin with low styrene emission.   Its rapid wet-out, low exotherm and fast hardening characteristics make it ideal for spray applications which require a fast mould turn round.  Variants giving a range of geltimes and viscosities are also available. During the spray-up phase, styrene emissions from Crystic 2-446PA are considerably reduced compared to normal spray applied resins.   Levels significantly lower than current or proposed legislation can  be attained.     This  reduction in  styrene emission is achieved with no loss of interlaminar adhesion.

Approvals

Crystic 2-446PA is approved by Det - Norske Veritas and by Lloyd’s Register of Shipping for use in the construction of craft under their survey.

Product Characteristics

Formulation

Crystic 2-446PA and its variants should be allowed to attain workshop temperature (18ºC - 20ºC) before use.  They need only the addition of a catalyst to start the curing reaction.  A colour change mechanism is incorporated into Crystic 2-446PA and its variants, to indicate the presence of catalyst.  After catalyst addition, the resins will change from blue to green, then to a yellowish colour, before gelation.  The recommended catalyst is Catalyst M (or Butanox M50) which should be added at 1% or 2% into the resin.   The geltime of Crystic 2-446PA can be approximately determined from the table below

Potlife

Table 1 - Catalyst M (or Butanox M50)
 

Parts  of  Catalyst  M  to  100 parts of Crystic 2-446PA

1.0

2.0

Pot life in minutes at 15ºC

62

41

Pot life in minutes at 20ºC

39

29

Pot life in minutes at 25ºC

25

20

The mould, resin and workshop should be at, or above, 15ºC before curing is carried out.

Additives

Certain pigments, fillers or extra styrene may adversely affect the spraying and final properties of Crystic 2-446PA and its variants.  Any additions should therefore be evaluated before any large scale use.

Postcuring

Satisfactory laminates for many applications can be made from Crystic 2-446PA and its variants, by curing at workshop temperature(20ºC).  Some increase in properties may be obtained by post curing.  The laminates should be allowed to cure for 24 hours at 20ºC, then be oven cured for 16 hours at 40ºC.

Typical properties

The following tables give typical properties of Crystics 2-446PA and its variants when tested in accordance with BS 2782.

Property

 

 

 

Liquid Resin

 

 

Crystic

2-446

PA

Crystic

2-446

PALV

Crystic

2-446

MPALV

Crystic

2-446

SPALV

Crystic

2-446

HPALV

Viscosity @ 25ºC Ferranti shear rate 37.35 sec1

Ferranti shear rate 4.500 sec1

 

poise poise

 

4.0

2.2

 

3.0

1.7

 

3.0

1.7

 

3.0

1.7

 

3.0

1.7

Specific Gravity @ 25ºC

 

1.10

1.10

1.10

1.10

1.10

Acid Value

mg

KOH/g

17

23

23

16

23

Volatile Content

%

41

42

42

43

42

Appearance

 

Bluish

Bluish

Bluish

Bluish

Bluish

Stability in the dark @ 20ºC

months

3

3

3

3

3

Geltime @ 25ºC using Resin 100 pbw Catalyst M I pbw

 

minutes

 

25

 

25

 

42

 

18

 

42

 

Property

 

Fully Cured* Resin

(unfilled casting)

Barcol Hardness (Model GYZJ 934-1)

 

42

Deflection Temperature under load † (1.80 MPa)

ºC

67

Water Absorption 24 hours at 23ºC

mg

15

Tensile Strength

MPa

50

Tensile Modulus

MPa

3800

Elongation at Break

%

1.5

Specific Gravity at 25ºC

 

1.20

Volumetric Shrinkage

%

8.3

*     Curing Schedule - 24 hrs @ 20ºC, 3 hrs @ 80ºC

†     Curing Schedule - 24 hrs @ 20ºC , 5 hrs @ 80ºC, 3 hrs @ 120ºC 

Property

 

C.S.M** Laminate

Glass Content

%

28

Tensile Strength

MPa

98

Tensile Modulus

MPa

7600

Elongation at Break

%

1.7

Flexural Strength

MPa

190

Flexural Modulus

MPa

7400

**   Made with 4 layers 450g/m2 PB CSM 

Curing schedule - 24hrs @ 20ºC, 16hrs @ 40ºC 

Storage 

Crystic 2-446PA and its variants should be stored in the dark in suitable closed containers.  It is recommended that the storage temperature should be less than 20ºC where practical, but should not exceed 30ºC.  Ideally, containers should only be opened immediately prior to use.  Where they have to be stored outside, it is recommended that they are kept in a horizontal position to avoid the possible ingress of water. 

Packaging 

Crystic 2-446PA and its variants are supplied in 25kg and 200kg containers. Bulk supplies can be delivered by road tanker.  

Health & Safety 

Please see separate Material Safety Data Sheet.


Design – Atelier