3-1.Formability

SHINKOLITE®-APX is improved in formability compared with SHINKOLITE L (normal continuous cast sheet) and S (cell cast sheet) and can be pulled into a sharp corner in a short radius under a comparatively low temperature. SHINKOLITE®-APX may be formed at higher temperatures than SHINKOLITE L without bubbling.

Fig. 3-1. Thermoformability Index of SHINKOLITE®-A-PX (L, PX)

SHINKOLITE®-APX has a wider vacuum forming temperature range compared to SHINKOLITE L. This means it is very easy-forming acrylic sheets.

• 3-1-2 Vacuum Forming Range of SHINKOLITE®-APX (L, PX)

  Fig. 3-2 Vacuum Forming Range of SHINKOLITE®-APX (L, PX)

• 
• 3-1-3 Elongation against the temperature in the Tensile Test.

  SHINKOLITE®-APX stretches evenly with little variation in thickness when formed at higher temperatures. Comparatively, standard acrylic sheet heated to similar high temperatures may rupture or form with very uneven thickness throughout the part.

  
  

  Fig. 3-3 Tensile Test Results of SHINKOLITE

  

3-2. Chemical Resistance

We measured the broken time of the acrylic test pieces which were stretched by 150%, left under stresses of 13Mpa (9.8 lb/inch2) and dipped in styrene monomer as a solvent. A crosslinked acrylic sheet takes a longer time before breaking down than one which is noncrosslinked. This means that a crosslinked sheet will have much less chance of developing problems after fiberglassing.

Fig. 3-4 Measurement of Broken-Time

Test method: ASTM D-543 after 7 days immersion at 25°C (77°F) The following results were determined using 3 mm thickness clear SHINKOLITE®-APX sheet. Results may vary some what on other thickness and/or colors.

Reagent	Change in appearance
Acetone	Swollen
iso-Octane	None
Ethyl Alcohol (95%)	None
Ethyl Alcohol (50%)	None
2-ethylhexylsebacate	None
Hydrochloric acid (s.g. 1.19)	None
Hydrochloric acid (10%)	None
Sodium chloride (10%)	None
Oleic acid	None
Olive oil	None
Hydrogen peroxide (28%)	None
Hydrogen peroxide (3%)	None
Sodium hydroxide (48%)	None
Sodium hydroxide (10%)	None
Sodium hydroxide (1%)	None
Citric acid (10%)	None
Chromic acid (40%)	Roughened surface yellowish discoloring
Mineral oil	None
Acetic acid (5%)	None
Ethyl acetate	Swollen
Carbon tetrachloride	Swollen slightly
Nitric acid (40%)	None
Lacquer thinner	Swollen

Reagent	Change in appearance
Nitric acid (10%)	None
Sodium hypochlorite	None
Ammonium hydroxide (s.g. 0.9)	None
Ammonium hydroxide (10%)	None
Soap aqua solution (1%)	None
Sodium carbonate (20%)	None
Sodium carbonate (2%)	None
Turpentine	None
Toluene	Swollen
Kerosene	None
Ethylene dichloride	Swollen
Hydrofluoric acid (40%)	Swollen, whitening
n-Heptane	None
Phenolic solution (5%)	Swollen slightly
Transformer oil	None
Methyl alcohol	Swollen slightly
Cotton oil	None
Sulfuric acid (30%)	None
Sulfuric acid (3%)	None
Water (distilled)	None
Sea water	None
Isopropyl alcohol	None

3-3. Stain Resistance

Test method: ANSI Z124.1-1974

Reagent	Ratings
1. Black crayon	covered	uncovered
2. Shoe polish	1	1
3. Washable ink	1	1
4. Gentian violet	1	1
5. Lipstik	1	1
6. Hair dye	1	1
7. Iodine solution 16 hr.	1	1
8. Iodine solution 4 hr.	1	1
9. Iodine solution 30 min.	1	1
10. Iodine solution 5 min.	1	1

Rating of 1: Wash the specimen with tap water and cheesecloth using 20 scrub cycles with normal hand pressure.