O'Brill Company

Construction Specialty Suppliers

       6626 N. Milwaukee Ave.

Niles, IL 60714

773-775-1122 or 847-647-0005

FAX 847-647-7819

Since 1967

Home Up Catalog Front Catalog Back Bob O'Brill Feedback Site Map Search

Patch-Rite     |    Products     |     Manufacturers     |     Price Guide     |     News





NO. 342


Speeds initial setting time...makes mix easier to place...saves time and money

SEALTIGHT HYDRASET-FREE Non-Chloride Concrete Set Accelerator is a ready-to-use, liquid admixture designed to speed initial setting time for concrete and mortar.

Technical Description
SEALTIGHT HYDRASET-FREE Non-Chloride Concrete Set Accelerator is a ready-to-use, liquid admixture. It accelerates initial setting time 1 to 3 times faster than normal for mortar and concrete. HYDRASET-FREE improves workability and strength while it hastens the hydration of cement. It makes the mix easier to place and speeds construction by shortening the initial set and curing time.

Labor and time are saved, because forms and other protection can be removed earlier...and finishing can be initiated. HYDRASET-FREE should not be limited to use during months when temperatures are in the 20 to 45F (-7 to +7C) range. Increased workability and earlier strength are also obtained when temperatures are in the 50 to 65F (10 to 18C) range, because any time the temperature drops below 70F (21C), there is a reduction in the rate of cement hydration. During cold and hot weather applications, follow 305 & 306 recommendations.

HYDRASET-FREE is recommended for use during cool and cold weather to reduce the risk of frozen mortar and concrete mixes. However, HYDRASET-FREE can be used any time the temperature drops below 70F (21C).

Features and Benefits

bulletAccelerates initial set time 1 to 3 times faster than normal for concrete and mortar
bulletAids in strength development
bulletHastens hydration of cement
bulletIncreases workability or density of mix in colder temperatures
bulletSpeeds construction due to reduced setting and curing time
bulletAllows earlier removal of concrete forms or other protection
bulletPermits earlier finishing

HYDRASET-FREE is added directly to the mix water. Reduce the amount of water proportionally to compensate for the liquid addition. For masonry mortar, 2 quarts (1.89 liters) of HYDRASET-FREE for 1 bag of cement should be used. For mortar cements which are 50% Portland Cement and 50% lime, 1/2 the amount, or 1 quart (950 ml) of HYDRASET-FREE is required.


5 gallon (18.93 liter) Pails
55 gallon (208.20 liter) Drums

For concrete, the following quantities are recommended:
Temperature Range
Above 70F (21C)
70 to 32F (21-0C)
32 to 25F (0 to-4C)
25 to 20F (-4 to-7C)
Suggested Quantity of HYDRASET-FREE
1 pt. (.47 l) per bag of cement
1 qt. (.95 l) per bag of cement
1 to 1-1/2 qts (.95 to 1.42 l) per bag of cement
2 qts. (1.89 l) per bag of cement

ASTM C 494, Types C & E
AASHTO M 194, Type C
Corps of Engineers CRD C 87, Type C

HYDRASET-FREE affects only the Portland Cement portion of the mix and is not an antifreeze for the water portion. Protect from freezing. HYDRASET-FREE has no effect on straight lime mortars and should not be used with oxychloride stuccos. Use HYDRASET-FREE directly from the factory-sealed container; do not dilute. Harmful or fatal if swallowed. Product container provides complete application information. Read and follow application information and precautions. Refer to Material Safety DataSheet for Complete Health and Safety Information

This information last updated October 2000.

W. R. MEADOWS, INC. warrants that, at the time and place we make shipment, our materials will be of good quality and will conform with our published specifications in force on the date of acceptance of the order. THE FOREGOING WARRANTY SHALL BE EXCLUSIVE AND IN LIEU OF ANY OTHER WARRANTY, EXPRESS OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ALL OTHER WARRANTIES OTHERWISE ARISING BY OPERATION OF LAW, COURSE OF DEALING, CUSTOM OF TRADE OR OTHERWISE. As the exclusive remedy for breach of this Warranty, we will replace defective materials, provided, however, that the buyer examine the materials when received and promptly notify us in writing of any defect before the materials are used or incorporated into a structure. Three (3) months after W. R. MEADOWS, INC. has shipped the materials, all our Warranty and other duties with respect to the quality of the materials delivered shall conclusively be presumed to have been satisfied, all liability therefore terminates, and no action for breach of any such duties may thereafter be commenced. W. R. MEADOWS, INC. shall in no event be liable for consequential damages. Unless otherwise agreed to in writing, no warranty is made with respect to materials not manufactured by W. R. MEADOWS, INC. We cannot warranty or in any way guarantee any particular method of use or application of the performance of materials under any particular condition. Neither this Warranty nor our liability may be extended or amended by our salesmen, distributors or representatives, or by our distributor's representatives, or by any sales information or drawings.


Home Up 1100 - Clear Series 1200 - White 1300 - Clear 1600 - White 164 588 Precision Grout Ceramar Cera-Rod CG-86 Control Joints CS-309-25 CS-309-30 Deck-O-Foam Direct Fire Parking Sealant Duogard Duogard II Evapre Expo-Gloss Fibre Expansion Joint Gardox Hi-Spec Hydraset Hydraset-Free Intralok Lin-Seal Lin-Seal Emulsion Lin-Seal White Liqui-Hard Meadow-Plug Med-Cure Mel-Dek Mel-Drain DB Mel-Gard Melnar Mel-Prime SB VOC Mel-Prime WB Mel-Rol Pac-It Plastic Joint Materials Pourthane Premoulded Membrane Premoulded Tongue and Groove Protection Course PVC Waterstops Red Rosin Paper Rezi-Weld 1000 Rezi-Weld 3-2 Rezi-Weld Gel Paste State Rezi-Weld Gel Paste Rezi-Weld LV Rezi-Weld Rapid Set Roof Traffic Pads Sealex Sealmastic Sealmastic Emulsion Sealtight 1190 Sealtight 158 Sealtight 3405 Sealtight Acry-Lok Sealtight Air-Shield Sealtight CR-90 Sealtight Deck-O-Seal Sealtight Futura-15 Sealtight Kool-Rod Sealtight Meadow-Crete FNP Sealtight Meadow-Crete GPS Sealtight Meadow-Crete H2 Sealtight Meadow-Patch 20 Sealtight Meadow-Patch 5 Sealtight Meadow-Patch T1 Sealtight Meadow-Patch T2 Sealtight Patch-Prime Sealtight Poly-Grip Sealtight Poly-Jet 1614 Sealtight Poly-Jet 200-E Sealtight Poly-Jet 3406 Sealtight Premoulded Membrane Sealtight Rezi-Weld Flex Sealtight Safe-Seal 3405 Sealtight Sealex E-Z Sealtight Ultrite Degreaser Sealtight Seal Cure CS-309-25 Sewer Joint Sof-Seal Tiah Vibraflex Vocomp-20 Vocomp-25 Vocomp-30

Send mail to webmaster@obrillcompany.com with questions or comments about this web site.
Copyright 2002 O'Brill Company
Last modified: August 09, 2004