

🔧 Rock-solid repairs in a flash — don’t let your projects wait!
HARTLINE 10001 Rockite Expansion Cement is a professional-grade, fast-setting cement powder that cures in 15 minutes and achieves 4500 PSI compression strength within an hour. Designed for permanent bonding to metal and concrete, it’s ideal for anchoring hardware like bolts, posts, and screws. Trusted by builders for decades, this water-resistant, shrink-free formula ensures durable, reliable repairs for construction and industrial applications.
| ASIN | B000VBRB00 |
| Best Sellers Rank | #22,037 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #58 in Contact Cements |
| Brand Name | Hartline |
| Color | No Color |
| Compatible Material | Metal |
| Container Type | Bottle |
| Customer Reviews | 4.3 4.3 out of 5 stars (947) |
| Full Cure Time | 1 Hours |
| Global Trade Identification Number | 00033122100013 |
| Included Components | Cement |
| Item Form | Powder |
| Item Package Quantity | 1 |
| Item Type Name | HARTLINE 10001 Rockite Expansion Cement 15 Min 1 Lb |
| Item Weight | 1 Pounds |
| Manufacturer | Jensen (Home Improvement) |
| Material Type | Plastic |
| Model | 10001 |
| Other Special Features of the Product | Unexcelled strength and bonding qualities, sets in 15 minutes, does not shrink, develops compression strength of 4500 lbs per sqin, grips metal & concrete permanently, anchors bolts, posts, screws, checks, hooks, bowls, washers, railings, rods, signs, pulleys, racks, poles, seats & motors |
| Specific Uses For Product | Construction, Repair, Industrial |
| UPC | 033122100013 |
| Unit Count | 454 Grams |
| Viscosity | Low viscosity |
| Volume | 16 Fluid Ounces |
| Warranty Description | Warranty |
| Water Resistance Level | Water Resistant |
E**T
Preparation is the key. Follow directions exactly.
Tried many times always with a good result. This product has been around for many decades. Fast and easy to use. Best concrete patch ever. Highly recommended by 50+ year builder.
D**S
Worked Great!
I got this to fix a wobbly mailbox post (which seems to be a popular reason). I thought I had ruined things because I got the mix way too watery. I figured I would have to order more and try again, being more careful with the mixing. BUT a couple of hours after I had poured it around the post and set a pole to prop it up straight, it was solid as a rock.
S**F
No waste
Easy to use, you don’t have to buy a huge amount for a small job
T**E
Glad that it worked
This product worked well for me. No clear instruction for mixing. I used 4.5 oz water per AI, but came out very runny. But I used it anyway to see what happens. It took several hours to hardend. To my pleasant surprise, it worked! You may want to use less water for better result. See photos.
N**L
Not sure if I did it correctly...
This is supposed to be expansion cement. I am afraid I might have been expecting too much. After the cement cured (hard as a rock), the fence post did not seem to be anchored any better. Also, the instructions for mixing the cement were very general. I needed to check other sources for more detailed instructions that helped me identify the amount of water and cement to use.
I**I
Temporary fix up
Great for temporary fix ups for my shower tile fill ins
K**.
Thin powder does not hold like concrete.
Such a waste. Glad it was less than $10! I tried to put some in a planter pot for an artifical plant to hold down weight, it was thin dust and just disappeared with water. It was laughable!! Awful. Good thought and sounded like a great idea, but didn’t work at all.
D**A
Easy mix
This was nice quick and easy to mix. I used it for a mailbox post and it’s still holding up Good just wish I would’ve ordered more than one box didn’t realize it was a small box, but the little batch did its job
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