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    Investment Mixing & Burnout Instructions For Kerr Products

    Instruction Steps


    1. Weigh Investment

    2.   Measure Water

    3.   Always add investment to water

    4.   Mix 3-3½ Minutes

    5.   Vacuum for 20 seconds after starts to boil

    6.   Pour into flask

    7.   Vacuum up to 90 seconds.

    8.   Let flasks sit still for 2 hours

    9.   Preheat Furnace to 300° F / 149°C

    10.   Remove spruce base

    11.   Load into furnace

    12.   Follow burnout cycle

     

    Powder & Water Requirements for Flask Sizes

    Water / Powder Ratio: 40/100

    First number represents investment powder (in ounces). Second figure represents water (in milliliters).
    Diameter2" tall2½" tall3" tall3½" tall4" tall5" tall6" tall
    2"5 oz. / 57 ml.6 oz. / 68 ml.7.5 oz. / 85 ml.9 oz. / 102 ml.10 oz. / 114 ml.  
    2½"8 oz. / 91 ml.10 oz. / 114 ml.12 oz. / 136 ml.14 oz. / 160 ml.16 oz. / 182 ml.20 oz. / 228 ml. 
    3"12 oz. / 136 ml.15 oz. / 170 ml.18 oz. / 205 ml.21 oz. / 240 ml.24 oz. / 274 ml.30 oz. / 340 ml.32 oz. / 410 ml.
    3½"16 oz. / 182 ml.20 oz. / 228 ml.24 oz. / 274 ml.28 oz. / 320 ml.32 oz. / 364 ml.40 oz. / 456 ml.48 oz. / 548 ml.
    4"18 oz. / 205 ml.23 oz. / 262 ml.27 oz. / 308 ml.32 oz. / 364 ml.36 oz. / 410 ml.48 oz. / 546 ml.56 oz. / 637 ml.
    5"    3½ lb. / 682 ml.4½ lb. / 864 ml.5½ lb. / 1000 ml.

    Water / Powder Ratio: 38/100

    First number represents investment powder (in ounces). Second figure represents water (in milliliters).
    Diameter2" tall2½" tall3" tall3½" tall4" tall5" tall6" tall
    2"5 oz. / 53.9 ml.6 oz. / 64.6 ml.7.5 oz. / 80.8 ml.9 oz. / 97 ml.10 oz. / 107.8 ml.  
    2½"8 oz. / 86.2 ml.10 oz. / 107.8 ml.12 oz. / 129 ml.14 oz. / 150.9 ml.16 oz. / 172.5 ml.20 oz. / 215.6 ml. 
    3"12 oz. / 129.3 ml.15 oz. / 161.7 ml.18 oz. / 194 ml.21 oz. / 226.4 ml.24 oz. / 258 ml.30 oz. / 323 ml.32 oz. / 345 ml.
    3½"16 oz. / 172 ml.20 oz. / 215 ml.24 oz. / 258 ml.28 oz. / 301 ml.32 oz. / 344 ml.40 oz. / 430 ml.48 oz. / 5168 ml.
    4"18 oz. / 194 ml.23 oz. / 247.9 ml.27 oz. / 291 ml.32 oz. / 344 ml.36 oz. / 387 ml.48 oz. / 516 ml.56 oz. / 602 ml.
    5"    3½ lb. / 645 ml.4½ lb. / 817 ml.5½ lb. / 946 ml.

    Conventional Mixing/Working Time

    • Minutes 1-3 - Add powder to water & mix
    • Minutes 4-6 - Vacuum the mixing bowl
    • Minute 7 - Pour into flask
    • Minute 8 - Vacuum flask
    • Minute 9 - Top off flask
    • Minute 10 - Setting time
    • Minutes 11-12 - Gloss off

    Vacuum Mixing/Working Time

    • Minutes 1-5 - Add powder to water & mix
    • Minutes 6-8 - Fill the flasks
    • Minute 9 - Setting time
    • Minute 10 - Gloss off

    Casting Temperatures

    • Ladies rings - Filigree or intricate designs. 900° F-1000° F
    • Gents rings - Heavier designs. 700° F-900° F

    During the last 1-2 hours of burnout, the temperature must be adjusted so that the flasks are at a correct temperature for casting.


    2-1/2" x 2-1/2"

    5 hour cycle

    1 hour 300° F
    1 hour 700° F
    2 hour 1350° F
    1 hour casting temperature

    3-1/2" x 4"

    8 hour cycle

    2 hour 300° F
    2 hour 700° F
    3 hour 1350° F
    1 hour casting temperature

    4" x 8"

    12 hour cycle

    2 hour 300° F
    2 hour 700° F
    2 hour 900° F
    4 hour 1350° F
    2 hour casting temperature

    Notes

    • Storage - Always store investment in a dry environment. After use, expel excess air from plastic bag and close lid tightly.
    • Mixing - The investment should always be added to the water in the recommended water/powder ratios.
    • Working Time - The work time is the time that has elapsed between adding the powder to the water, and when the investment thickens.
    • Water Temperature - Water should be 70° F- 75° F and should be measured with a thermometer to insure consistency. Colder water extends the work time, warmer water shortens the work time.
    • Investment Temperature - Investment should always be stored at the same temperature. If the temperature of the investment is warmer in the summer and cooler in the winter, the water temperature must be raised or lowered to compensate. Temperature of the investment should be periodically measured with a thermometer. Colder investment extends the work time, warmer investment shortens the work time.